EXHIBIT 99(g)

                               CGU ACQUISITION CO.

                        $1,000,000,000 CREDIT FACILITIES

                         SUMMARY OF TERMS AND CONDITIONS

                               September 24, 2000

                  White Mountains Insurance Group, Ltd., a company incorporated
in Bermuda ("WHITE MOUNTAINS"), together with the investors previously
identified to the Arranger (the "INVESTOR GROUP"), will form a holding company
(the "PARENT"), which will in turn form an acquisition corporation ("ACQUISITION
CO.", or the "BORROWER"), which will then acquire (the "ACQUISITION") the U.S.
property and casualty insurance business (the "ACQUIRED ASSETS") of CGU plc (the
"SELLER"). The Acquisition will be consummated pursuant to the Stock Purchase
Agreement, dated as of September 24, 2000, among CGU International Holdings
Luxembourg S.A., a Luxembourg corporation, CGU Holdings LLC, a Delaware limited
liability company, Seller and White Mountains (the "STOCK PURCHASE AGREEMENT").
The Acquisition will be accomplished as described in Annex II to this Summary of
Terms and Conditions; certain terms defined in such Annex II are used herein
with the meanings given therein.

                   In that connection, credit facilities in an aggregate
principal amount of $1,000,000,000 are being established, as described below.

I.     PARTIES

Borrower:           Acquisition Co. (the "BORROWER").

Guarantors:         The Parent and each subsidiary of the Borrower other than
                    any insurance company subsidiary (the "GUARANTORS"; the
                    Borrower and the Guarantors, collectively, the "CREDIT
                    PARTIES").

Sole Advisor, Sole
Arranger and Sole
Book Manager:       Lehman Brothers Inc. (in such capacity, the "ARRANGER").

Syndication Agent:  Lehman Commercial Paper Inc. (in such capacity, the
                    "SYNDICATION AGENT").

Administrative
Agent:              Lehman Commercial Paper Inc. (in such capacity, the
                    "ADMINISTRATIVE AGENT").

Lenders:            A syndicate of banks, financial institutions and other
                    entities arranged by the Arranger (collectively, the
                    "LENDERS").


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II.    TYPES AND AMOUNTS OF CREDIT FACILITIES

1.     TERM LOAN FACILITY

Type and Amount of
Facility:         Five-year term loan facility (the "TERM LOAN FACILITY") in an
                  aggregate principal amount equal to $700,000,000 (the loans
                  thereunder, the "TERM LOANS"). The Term Loans shall be
                  repayable in installments in the amounts set forth below for
                  each year following the Closing Date (as defined below):

                           YEAR     AMOUNT

                           Year 1   $ 95,000,000
                           Year 2   $110,000,000
                           Year 3   $120,000,000
                           Year 4   $180,000,000
                           Year 5   $195,000,000

                  The foregoing amounts payable in each year will be payable in
                  equal quarterly installments during such year; PROVIDED, that
                  (i) no principal installment shall be required to be paid
                  before the later of December 31, 2001 and the first
                  anniversary of the Closing Date and (ii) if, having used its
                  best efforts to obtain regulatory approvals required to permit
                  quarterly payment of dividends by its insurance company
                  subsidiaries, the Borrower does not obtain such approvals for
                  payments prior to the second anniversary of the Closing Date,
                  principal payments in respect of the Term Loans prior to the
                  second anniversary of the Closing Date will be required to be
                  made once per year rather than quarterly.

                  The Arranger, in its sole discretion (after consultation with
                  the Borrower), may determine that the Term Loans shall
                  comprise two separate tranches (the Term Loans comprising one
                  tranche with a final maturity on the fifth anniversary of the
                  Closing Date, the "TRANCHE A TERM LOANS" and the Term Loans
                  comprising the other tranche with a final maturity on the
                  sixth anniversary of the Closing Date, the "TRANCHE B TERM
                  LOANS"). The aggregate amount of Term Loans constituting
                  Tranche A Term Loans and the Tranche B Term Loans,
                  respectively, shall be determined by the Arranger in its sole
                  discretion after consultation with the Borrower.

Availability:     The Term Loans shall be made in a single drawing on the
                  Closing Date.

Purpose:          The proceeds of the Term Loans shall be used to finance the
                  Acquisition, to repay certain existing indebtedness of CGU and
                  its subsidiaries, to pay related fees and expenses and for
                  general corporate purposes.


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2.     REVOLVING CREDIT FACILITY

Type and Amount of
Facility:         Five-year revolving credit facility (the "REVOLVING CREDIT
                  FACILITY"; together with the Term Loan Facility, the "CREDIT
                  FACILITIES") in the amount of $300,000,000 (the loans
                  thereunder, the "REVOLVING CREDIT LOANS").

Availability:     The Revolving Credit Facility shall be available on a
                  revolving basis during the period commencing on the Closing
                  Date and ending on the fifth anniversary thereof (the
                  "REVOLVING CREDIT TERMINATION DATE").

Letters of        A portion of the Revolving Credit Facility not in excess of
Credit            $25,000,000 shall be available for the issuance of letters of
                  credit (the "LETTERS OF CREDIT") by a Lender to be selected in
                  the syndication process (in such capacity, the "ISSUING
                  LENDER"). No Letter of Credit shall have an expiration date
                  after the earlier of (a) one year after the date of issuance
                  and (b) five business days prior to the Revolving Credit
                  Termination Date, PROVIDED that any Letter of Credit with a
                  one-year tenor may provide for the automatic renewal thereof
                  (in the absence of notice to the contrary from the Issuing
                  Lender) for additional one-year periods (which shall in no
                  event extend beyond the date referred to in clause (b) above).

                  Drawings under any Letter of Credit shall be reimbursed by the
                  Borrower (whether with its own funds or with the proceeds of
                  Revolving Credit Loans) on the next business day. To the
                  extent that the Borrower does not so reimburse the Issuing
                  Lender, the Lenders under the Revolving Credit Facility shall
                  be irrevocably and unconditionally obligated to reimburse the
                  Issuing Lender on a PRO RATA basis.

Swing Line Loans: A portion of the Revolving Credit Facility not in excess of
                  $10,000,000 shall be available for swing line loans (the
                  "SWING LINE LOANS") from a Lender to be selected in the
                  syndication process (in such capacity, the "SWING LINE
                  LENDER") on same-day notice. Any Swing Line Loans will reduce
                  availability under the Revolving Credit Facility on a
                  dollar-for-dollar basis. Each Lender under the Revolving
                  Credit Facility shall acquire, under certain circumstances, an
                  irrevocable and unconditional PRO RATA participation in each
                  Swing Line Loan.

Maturity:         The Revolving Credit Termination Date.

Purpose:          The proceeds of the Revolving Credit Loans shall be used to
                  finance the Acquisition, to repay certain existing
                  indebtedness of CGU and its subsidiaries, to pay related fees
                  and expenses and for working capital and general corporate
                  purposes of the Borrower and its subsidiaries in the ordinary
                  course of business.

III.   CERTAIN PAYMENT
       PROVISIONS

Fees and Interest
Rates:   As set forth on Annex I.


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Optional Prepayments
and Commitment
Reductions:       Loans may be prepaid and commitments may be reduced by the
                  Borrower in minimum amounts to be agreed upon. Optional
                  prepayments of the Term Loans shall be applied, FIRST, to
                  the next installment thereof due after the date of such
                  prepayment, and, SECOND, to the remaining installments
                  thereof ratably in accordance with the then outstanding
                  amounts thereof and may not be reborrowed.

Mandatory Prepayments
and Commitment
Reductions:       The following amounts shall be applied to prepay the Term
                  Loans and reduce the Revolving Credit Facility:

                  (a) 50% of the net proceeds, above a threshold amount to be
                  agreed upon, of any sale or issuance of equity by the Borrower
                  or any of its non-insurance company subsidiaries (with
                  exceptions to be agreed upon, including exceptions permitting
                  proceeds of equity to be used to prepay the Seller Note and to
                  repay the $96,000,000 aggregate principal amount of medium
                  term notes due 2003 (the "MEDIUM TERM NOTES"), which were
                  issued by a predecessor to White Mountains and will become an
                  obligation of the Borrower in connection with the
                  Acquisition); and

                  (b) 100% of the net proceeds, above a threshold amount to be
                  agreed upon, of any sale or other disposition by assets by the
                  Borrower or any of its non-insurance company subsidiaries
                  (with exceptions to be agreed upon, including exceptions
                  permitting disposition of portfolio investments and the
                  reinvestment of the proceeds thereof in other portfolio
                  investments).

                  All such amounts shall be applied, FIRST, to the prepayment of
                  the Term Loans and, SECOND, to the permanent reduction of the
                  Revolving Credit Facility; PROVIDED, that the Revolving Credit
                  Facility shall not be reduced to less than $150,000,000
                  pursuant to the foregoing mandatory prepayment and commitment
                  reduction provisions. Each such prepayment of the Term Loans
                  made with the proceeds of asset sales shall be applied to the
                  installments thereof ratably in accordance with the then
                  outstanding amounts thereof and may not be reborrowed; and
                  each other such prepayment of Term Loans shall be applied,
                  FIRST, to the next installment thereof due after the date of
                  such prepayment, and, SECOND, to the remaining installments
                  thereof ratably in accordance with the then outstanding
                  amounts thereof and may not be reborrowed. The Revolving
                  Credit Loans shall be prepaid and the Letters of Credit shall
                  be cash collateralized or replaced to the extent such
                  extensions of credit exceed the amount of the Revolving Credit
                  Facility.

IV.    COLLATERAL       The obligations of the Borrower and each Guarantor in
                        respect of the Credit Facilities shall be secured by a

                        perfected first priority security interest in the
                        capital stock of each of its subsidiaries (including the
                        capital stock of the Borrower, which will be pledged by
                        the Parent) and substantially all of its other
                        intangible assets (it being understood that the Parent
                        and its subsidiaries (other than insurance company
                        subsidiaries) will not have any material tangible
                        assets. Not more than 65% of the capital stock of any


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                        foreign subsidiaries will be required to be pledged.

V.     CERTAIN CONDITIONS

Initial
Conditions:       The availability of the Credit Facilities shall be
                  conditioned upon satisfaction of, among other things, the
                  following conditions precedent (the date upon which all such
                  conditions precedent shall be satisfied, the "CLOSING DATE")
                  on or before March 31, 2001 (which date shall be extended to
                  June 30, 2001 if the only condition to the consummation of the
                  Acquisition as set forth in the Stock Purchase Agreement that
                  has not been met on March 31, 2001 is the receipt of all
                  required governmental approvals) (with references to the
                  Borrower and its subsidiaries in this paragraph being deemed
                  to refer to and include the Acquired Assets after giving
                  effect to the Acquisition):

                                    (a) Each Credit Party shall have executed
                                    and delivered customary definitive financing
                                    documentation with respect to the Credit
                                    Facilities, which shall be reasonably
                                    satisfactory to all parties thereto and
                                    shall reflect the terms and conditions set
                                    forth herein and such other terms and
                                    conditions, consistent with the terms and
                                    conditions set forth herein, as shall be
                                    reasonably acceptable to all parties thereto
                                    (the "CREDIT DOCUMENTATION").

                                    (b) White Mountains shall have received
                                    commitments from (i) the Investor Group to
                                    purchase for cash an amount consistent with
                                    the Sources and Uses Table attached as Annex
                                    I-B (the "SOURCES AND USES Table") of equity
                                    securities of the Parent or White Mountains
                                    and (ii) Berkshire Hathaway to purchase no
                                    less than an amount consistent with the
                                    Sources and Uses Table of convertible
                                    preferred stock of White Mountains. The
                                    Parent shall have received at least an
                                    amount consistent with the Sources and Uses
                                    Table in cash and marketable securities from
                                    the issuance of its equity securities to
                                    White Mountains and/or the Investor Group.
                                    The Borrower shall have received at least an
                                    amount consistent with the Sources and Uses
                                    Table in cash and marketable securities from
                                    the issuance of its equity securities to the
                                    Parent. CGU shall have received as dividends
                                    from its subsidiaries cash in an amount
                                    consistent with the Sources and Uses Table,
                                    and such cash shall be available for use to
                                    pay a portion of the purchase price of the
                                    Acquisition.

                                    (c) The Acquisition shall have been
                                    consummated in accordance with the Stock
                                    Purchase Agreement (without any material
                                    waiver or other modification of any material
                                    provision thereof unless such waiver or
                                    other modification has been approved by the
                                    Administrative Agent), and as described in
                                    Annex II hereto. After giving effect to the
                                    consummation of the Acquisition, the
                                    Borrower shall have no material indebtedness
                                    other than indebtedness under the Credit
                                    Facilities, the Seller Note, the Medium Term
                                    Notes, approximately $30,000,000 of existing


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                                    indebtedness of CGU and indebtedness of
                                    Folksamerica in respect of a promissory note
                                    in the original principal amount of
                                    approximately $21,000,000 (which is
                                    currently carried on the books of
                                    Folksamerica at an outstanding principal
                                    amount of approximately $2,000,000).

                                    (d) The Lenders, the Administrative Agent
                                    and the Arranger shall have received all
                                    fees required to be paid on or before the
                                    Closing Date, and the Administrative Agent
                                    shall have received reimbursement of all
                                    out-of-pocket expenses of the Arranger and
                                    the Administrative Agent payable by the
                                    Borrower in connection with the Credit
                                    Facilities.

                                    (e) All governmental and third party
                                    approvals required for the financing
                                    contemplated hereby and the creation of the
                                    security interests contemplated hereby, and,
                                    to the extent required by the Stock Purchase
                                    Agreement, all governmental and third party
                                    approvals required for the Acquisition and
                                    the continuing operations of the Borrower
                                    and its subsidiaries, shall have been
                                    obtained and be in full force and effect,
                                    and all applicable waiting periods shall
                                    have expired without any action being taken
                                    or threatened by any competent authority
                                    which would restrain, prevent or otherwise
                                    impose materially adverse conditions on the
                                    Acquisition or the financing thereof.

                                    (f) The Lenders shall have received (i)
                                    audited consolidated financial statements of
                                    White Mountains and CGU for fiscal years
                                    1998 and 1999 (and, if the Closing Date
                                    occurs after audited financial statements of
                                    White Mountain and CGU for fiscal year 2000
                                    are available, such financial statements)
                                    and (ii) unaudited interim consolidated
                                    financial statements of White Mountains and
                                    CGU for each fiscal quarterly period ended
                                    subsequent to the date of the latest
                                    financial statements delivered pursuant to
                                    clause (i) of this paragraph as to which
                                    such financial statements are available. All
                                    such financial statements shall be in
                                    reasonable detail, shall be prepared in
                                    accordance with generally acceptable
                                    accounting principles and shall be certified
                                    by an appropriate financial officer or
                                    accountants, as applicable.

                                    (g) The Lenders shall have received a PRO
                                    FORMA consolidated balance sheet of the
                                    Borrower as at the date of the most recent
                                    consolidated balance sheet delivered
                                    pursuant to paragraph (f) above, adjusted to
                                    give effect to the consummation of the
                                    Acquisition and the financings and other
                                    transactions contemplated hereby as if such
                                    transactions had occurred on such date. Such
                                    PRO FORMA consolidated balance sheet shall
                                    be prepared in reasonable detail and in
                                    accordance with customary standards.

                                    (h) The Lenders shall have received (i)
                                    unaudited


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                                    consolidating financial statements of CGU
                                    for fiscal years 1998 and 1999, (ii)
                                    unaudited interim consolidating financial
                                    statements of CGU for each fiscal quarterly
                                    period ended subsequent to the date of the
                                    latest financial statements delivered
                                    pursuant to clause (i) of this paragraph as
                                    to which such financial statements are
                                    available and (iii) monthly PRO FORMA
                                    financial statements of the Acquired Assets
                                    for each monthly period ending from and
                                    after May 31, 2000 and prior to the Closing
                                    Date. All such financial statements shall be
                                    in reasonable detail, shall be prepared in
                                    accordance with generally acceptable
                                    accounting principles and shall be certified
                                    by an appropriate financial officer or
                                    accountants, as applicable.

                                    (i) The Lenders shall have received a
                                    business plan for fiscal years 2000-2006 and
                                    a written analysis of the business and
                                    prospects of the Borrower and its
                                    subsidiaries for the period from the Closing
                                    Date through the final maturity of the Term
                                    Loans. Such business plan and analysis shall
                                    be prepared in reasonable detail and in
                                    accordance with customary standards.

                                    (j) All material insurance company
                                    subsidiaries of the Borrower shall have
                                    received ratings from A.M. Best of at least
                                    A-.

                                    (k) The Lenders shall have received the
                                    results of a recent lien search in each
                                    relevant jurisdiction with respect to the
                                    Credit Parties, and such search shall reveal
                                    no liens on any of the assets of the Credit
                                    Parties except for liens permitted by the
                                    Credit Documentation or liens to be
                                    discharged on or prior to the Closing Date
                                    pursuant to documentation satisfactory to
                                    the Administrative Agent. It is understood
                                    that mortgages securing approximately
                                    $30,000,000 of existing debt of insurance
                                    company subsidiaries shall be permitted.

                                    (l) Insurance company subsidiaries of CGU
                                    shall have completed a reinsurance
                                    transaction with Berkshire Hathaway (as
                                    described in the letter, dated July 18,
                                    2000, from Ajit Jain of Berkshire Hathaway
                                    Group to Ray Barrette of White Mountains,
                                    together with the Reinsurance Agreement
                                    Terms attached to such letter) for not less
                                    than $2,500,000,000 (relating to certain
                                    discontinued operations).

                                    (m) The aggregate statutory net worth of the
                                    Borrower's insurance company subsidiaries
                                    shall be not less than $2,300,000,000.

                                    (n) The Lenders shall have received such
                                    legal opinions, documents and other
                                    instruments as are customary for
                                    transactions of this type or as they may
                                    reasonably request.


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On-Going Conditions:    The making of each extension of credit shall be
                        conditioned upon (a) the accuracy of all representations
                        and warranties in the Credit Documentation (including,
                        without limitation, the material adverse change and
                        litigation representations) and (b) there being no
                        default or event of default in existence at the time of,
                        or after giving effect to the making of, such extension
                        of credit.

                             As used herein and in the Credit Documentation, a
                        "material adverse change" shall mean:

                                  (i) with respect to the "material adverse
                             change" representation and warranty to be made on
                             the Closing Date, any event or development that has
                             had or would reasonably be expected to have a
                             material adverse effect on (a) the business,
                             operations, property or financial condition of the
                             Borrower and its subsidiaries, taken as a whole,
                             the Acquired Assets or White Mountains and its
                             subsidiaries, taken as a whole, or (b) the validity
                             or enforceability of any of the Credit
                             Documentation or the rights and remedies of the
                             Administrative Agent and the Lenders thereunder,
                             other than any such effect resulting from (1)
                             changes in general economic or securities or
                             financial market conditions (including changes in
                             interest rates), (2) any write-off of assets or
                             establishment of liabilities identified in Schedule
                             1.1(a) of the Disclosure Schedule to the Stock
                             Purchase Agreement, in each case in amounts
                             materially consistent with the amounts reflected in
                             the Projections provided by White Mountains to LBI
                             and LCPI prior to the date hereof or (3) any
                             ratings downgrade of any material insurance company
                             subsidiary of the Borrower by A.M. Best to a level
                             not below A-; and

                                  (ii) with respect to the "material adverse
                             change" representation and warranty to be made at
                             any time after the Closing Date, any event,
                             development or circumstance that has had or could
                             reasonably be expected to have a material adverse
                             effect on (a) the Acquisition or the other
                             transactions contemplated hereby, (b) the business,
                             assets, property or financial condition of the
                             Borrower and its subsidiaries taken as a whole, or
                             (c) the validity or enforceability of any of the
                             Credit Documentation or the rights and remedies of
                             the Administrative Agent and the Lenders
                             thereunder.

VI.    CERTAIN DOCUMENTATION
       MATTERS                      The Credit Documentation shall contain
                                    representations, warranties, covenants and
                                    events of default customary for financings
                                    of this type (in each case applicable to
                                    each of the Credit Parties, as appropriate),
                                    including, without limitation:

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Representations and
Warranties:                         Financial statements (including pro forma
                                    financial statements and statutory
                                    accounts); absence of undisclosed
                                    liabilities; no material adverse change;
                                    corporate existence; compliance with law;
                                    corporate power and authority;
                                    enforceability of Credit Documentation; no
                                    conflict with law or contractual
                                    obligations; no material litigation; no
                                    default; ownership of property; liens;
                                    intellectual property; no burdensome
                                    restrictions; taxes; Federal Reserve
                                    regulations; ERISA; Investment Company Act;
                                    subsidiaries; environmental matters;
                                    solvency; insurance regulatory matters;
                                    accuracy of disclosure; and creation and
                                    perfection of security interests.

Affirmative Covenants:              Delivery of financial statements, reports,
                                    statutory accounts, accountants' letters,
                                    projections, officers' certificates and
                                    other information reasonably requested by
                                    the Lenders; payment of other obligations;
                                    continuation of business and maintenance of
                                    existence and material rights and
                                    privileges; compliance with laws and
                                    material contractual obligations;
                                    maintenance of property and insurance;
                                    maintenance of books and records; right of
                                    the Lenders (subject to customary
                                    restrictions and standards) to inspect
                                    property and books and records; notices of
                                    defaults, litigation and other material
                                    events; compliance with environmental laws;
                                    agreement to obtain within 150 days after
                                    the Closing Date interest rate protection
                                    for at least 50% of the Term Loan Facility
                                    for a period of at least three years on
                                    terms and conditions satisfactory to the
                                    Administrative Agent; and agreement to
                                    either convert the Seller Note to common
                                    stock of the Parent or to refinance the
                                    Seller Note with the proceeds of common
                                    stock of the Parent or White Mountains or
                                    subordinated debt maturing after the Credit
                                    Facilities and having other terms and
                                    conditions reasonably satisfactory to the
                                    Lenders.

Financial Covenants:                Financial covenants (including, without
                                    limitation, minimum interest and fixed
                                    charge coverage, maximum leverage, minimum
                                    net worth, and minimum statutory surplus and
                                    minimum risk based capital ratio for each
                                    material insurance company subsidiary). The
                                    terms of the foregoing financial covenants
                                    are set forth in detail in Annex III hereto.

Negative Covenants:                 Limitations on: indebtedness (including
                                    preferred stock of subsidiaries); liens;
                                    guarantee obligations; mergers,
                                    consolidations, liquidations and
                                    dissolutions; sales of assets; leases;
                                    dividends and other payments in respect of
                                    capital stock (which will permit the
                                    Borrower to pay annual dividends and other
                                    restricted payments to the Parent, and the
                                    Parent to pay such amounts to its
                                    shareholders, in each case in an aggregate
                                    amount not exceeding $60,000,000, subject to
                                    compliance with covenants and absence of
                                    default under Credit Documentation, it being
                                    understood that the foregoing $60,000,000
                                    amount is based upon the assumptions that
                                    the


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                                    investment of Berkshire Hathaway in White
                                    Mountains will be in the amount of
                                    $300,000,000 and will require payment of
                                    dividends at the rate of 13% per annum, and
                                    such $60,000,000 amount will be subject to
                                    reduction to an amount to be agreed upon if
                                    either the amount of the Berkshire Hathaway
                                    investment or the required dividend rate is
                                    reduced); investments, loans and advances;
                                    optional payments and modifications of
                                    subordinated and other debt instruments;
                                    transactions with affiliates; sale and
                                    leasebacks; changes in fiscal year; negative
                                    pledge clauses; and changes in lines of
                                    business.

Events of Default:                  Nonpayment of principal when due; nonpayment
                                    of interest, fees or other amounts after a
                                    grace period to be agreed upon; material
                                    inaccuracy of representations and
                                    warranties; violation of covenants (subject,
                                    in the case of certain affirmative
                                    covenants, to a grace period to be agreed
                                    upon); cross-default to other material debt
                                    instruments; bankruptcy and insolvency
                                    events; certain ERISA events; material
                                    judgments; actual or asserted invalidity of
                                    any guarantee or security document,
                                    subordination provisions or security
                                    interest; and a change of control (as
                                    defined below).

Change of Control:                  (a) Prior to any initial public offering of
                                    the Parent's capital stock, White Mountains
                                    ceases to own, directly or indirectly, at
                                    least 50% of all of the outstanding capital
                                    stock of the Parent, and (b) after any
                                    initial public offering of the Parent's
                                    capital stock, (i) White Mountains ceases to
                                    own, directly or indirectly, at least 25% of
                                    all of the outstanding capital stock of the
                                    Parent, or (ii) any person or group other
                                    than White Mountains owns a greater
                                    percentage than White Mountains owns of all
                                    of the outstanding capital stock of the
                                    Parent or (iii) a majority of the directors
                                    of the Parent ceases to be persons appointed
                                    or approved by White Mountains.

Voting:                             Amendments and waivers with respect to the
                                    Credit Documentation shall require the
                                    approval of Lenders holding not less than a
                                    majority of the aggregate amount of the
                                    outstanding Loans and unused commitments
                                    under the Credit Facilities, except that (a)
                                    the consent of each Lender directly affected
                                    thereby shall be required with respect to
                                    (i) reductions in the amount or extensions
                                    of the scheduled date of amortization or
                                    final maturity of any Loan, (ii) reductions
                                    in the rate of interest or any fee or
                                    extensions of any due date thereof, (iii)
                                    increases in the amount or extensions of the
                                    expiry date of any Lender's commitment and
                                    (iv) modifications to the pro rata
                                    provisions of the Credit Documentation and
                                    (b) the consent of 100% of the Lenders shall
                                    be required with respect to (i)
                                    modifications to any of the voting
                                    percentages and (ii) releases of all or
                                    substantially all of the Guarantors or all
                                    or substantially all of the collateral.


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Assignments
and Participations:                 The Lenders shall be permitted to assign and
                                    sell participations in their Loans and
                                    commitments, subject, in the case of
                                    assignments (other than assignments (i) by
                                    the Administrative Agent, (ii) to another
                                    Lender or to an affiliate of a Lender or
                                    (iii) of funded Term Loans), to the consent
                                    of the Administrative Agent and the Borrower
                                    and, in the case of any assignment of
                                    commitments under the Revolving Credit
                                    Facility, the Issuing Lender and, the Swing
                                    Line Lender (which consent in each case
                                    shall not be unreasonably withheld). Non-pro
                                    rata assignments shall be permitted. In the
                                    case of partial assignments (other than to
                                    another Lender or to an affiliate of a
                                    Lender), the minimum assignment amount shall
                                    be $5,000,000, and, after giving effect
                                    thereto, the assigning Lender (if it shall
                                    retain any commitments or Loans) shall have
                                    commitments and Loans aggregating at least
                                    $5,000,000, in each case unless otherwise
                                    agreed by the Borrower and the
                                    Administrative Agent. Participants shall
                                    have the same benefits as the Lenders with
                                    respect to yield protection and increased
                                    cost provisions, subject to customary
                                    limitations. Voting rights of participants
                                    shall be limited to those matters with
                                    respect to which the affirmative vote of the
                                    Lender from which it purchased its
                                    participation would be required as described
                                    under "Voting" above. Pledges of Loans in
                                    accordance with applicable law shall be
                                    permitted without restriction. Promissory
                                    notes shall be issued under the Credit
                                    Facilities only upon request.

Yield Protection:                   The Credit Documentation shall contain
                                    customary provisions (a) protecting the
                                    Lenders against increased costs or loss of
                                    yield resulting from changes in reserve,
                                    tax, capital adequacy and other requirements
                                    of law and from the imposition of or changes
                                    in withholding or other taxes and (b)
                                    indemnifying the Lenders for "breakage
                                    costs" incurred in connection with, among
                                    other things, any prepayment of a Eurodollar
                                    Loan (as defined in Annex I) on a day other
                                    than the last day of an interest period with
                                    respect thereto.

Expenses and
Indemnification:                    The Borrower shall pay (a) all reasonable
                                    out-of-pocket expenses of the Administrative
                                    Agent and the Arranger associated with the
                                    syndication of the Credit Facilities and the
                                    preparation, execution, delivery and
                                    administration of the Credit Documentation
                                    and any amendment or waiver with respect
                                    thereto (including the reasonable fees,
                                    disbursements and other charges of counsel
                                    and the charges of Intralinks) and (b) all
                                    out-of-pocket expenses of the Administrative
                                    Agent and the Lenders (including the fees,
                                    disbursements and other charges of counsel)
                                    in connection with the enforcement of the
                                    Credit Documentation.

                                    The Administrative Agent, the Arranger and
                                    the Lenders (and their affiliates and their
                                    respective officers, directors, employees,


                                                                              12


                                    advisors and agents) will have no liability
                                    for, and will be indemnified and held
                                    harmless against, any loss, liability, cost
                                    or expense incurred in respect of the
                                    financing contemplated hereby or the use or
                                    the proposed use of proceeds thereof (except
                                    to the extent resulting from the gross
                                    negligence or willful misconduct of the
                                    indemnified party).

Governing Law and Forum:            State of New York.

Counsel to the
Administrative Agent
and the Arranger:                   Simpson Thacher & Bartlett.


                                                                               1

                                                                         ANNEX I

                            INTEREST AND CERTAIN FEES

Interest Rate Options:              The Borrower may elect that the Loans
                                    comprising each borrowing bear interest at a
                                    rate per annum equal to:

                                          the Base Rate plus the Applicable
                                          Margin; or

                                          the Eurodollar Rate plus the
                                          Applicable Margin.

                                    PROVIDED, that all Swing Line Loans shall
                                    bear interest based upon the Base Rate.

                                    As used herein:

                                    "BASE RATE" means the highest of (i) the
                                    rate of interest publicly announced by
                                    Deutsche Bank, New York Office as its prime
                                    rate in effect at its principal office in
                                    New York City (the "PRIME RATE"), (ii) the
                                    secondary market rate for three-month
                                    certificates of deposit (adjusted for
                                    statutory reserve requirements) PLUS 1% and
                                    (iii) the federal funds effective rate from
                                    time to time PLUS 0.5%.

                                    "APPLICABLE MARGIN" means, initially, the
                                    rates per annum determined in accordance
                                    with the Pricing Grid attached hereto as
                                    Annex I-A (the "PRICING GRID") based upon
                                    the Level applicable to the Borrower on the
                                    Closing Date.

                                    "EURODOLLAR RATE" means the rate (adjusted
                                    for statutory reserve requirements for
                                    eurocurrency liabilities, as and if
                                    incurred) at which eurodollar deposits for
                                    one, two, three or six months (as selected
                                    by the Borrower) are offered in the
                                    interbank eurodollar market.

Interest Payment Dates:             In the case of Loans bearing interest based
                                    upon the Base Rate ("BASE RATE LOANS"),
                                    quarterly in arrears.

                                    In the case of Loans bearing interest based
                                    upon the Eurodollar Rate ("EURODOLLAR
                                    LOANS"), on the last day of each relevant
                                    interest period and, in the case of any
                                    interest period longer than three months, on
                                    each successive date three months after the
                                    first day of such interest period.

Commitment Fees:                    The Borrower shall pay a commitment fee
                                    calculated at the rate of .375% per annum on
                                    the average daily unused portion of the
                                    Revolving Credit Facility, payable quarterly
                                    in arrears; the commitment fee rate will be
                                    subject to reduction based upon performance
                                    criteria to be agreed upon. Swing Line Loans
                                    shall, for purposes of the commitment fee
                                    calculations only, not be


                                                                               2


                                    deemed to be a utilization of the Revolving
                                    Credit Facility.

Letter of Credit Fees:              The Borrower shall pay a commission on all
                                    outstanding Letters of Credit at a per annum
                                    rate equal to the Applicable Margin then in
                                    effect with respect to Revolving Credit
                                    Loans that are Eurodollar Loans on the face
                                    amount of each such Letter of Credit. Such
                                    commission shall be shared ratably among the
                                    Lenders participating in the Revolving
                                    Credit Facility and shall be payable
                                    quarterly in arrears.

                                    In addition to letter of credit commission,
                                    a fronting fee calculated at a rate per
                                    annum to be agreed upon by the Borrower and
                                    the Issuing Bank on the face amount of each
                                    Letter of Credit shall be payable quarterly
                                    in arrears to the Issuing Lender for its own
                                    account. In addition, customary
                                    administrative, issuance, amendment, payment
                                    and negotiation charges shall be payable to
                                    the Issuing Lender for its own account.

Default Rate:                       At any time when the Borrower is in default
                                    in the payment of any amount of principal
                                    due under the Credit Facilities, such amount
                                    shall bear interest at 2% above the rate
                                    otherwise applicable thereto. Overdue
                                    interest, fees and other amounts shall bear
                                    interest at 2% above the rate applicable to
                                    Base Rate Loans.

Rate and Fee Basis:                 All per annum rates shall be calculated on
                                    the basis of a year of 360 days (or 365/366
                                    days, in the case of Base Rate Loans the
                                    interest rate payable on which is then based
                                    on the Prime Rate) for actual days elapsed.


                                                                       Annex I-A

                                  PRICING GRID

                   S&P/MOODY'S    APPLICABLE MARGIN -    APPLICABLE MARGIN -
PRICING LEVEL      RATING         EURODOLLAR LOANS       BASE RATE LOANS

Level 1            >= BBB- AND         1.75%                  .75%
                   >= Baa3

Level 2            >= BBB- OR          2.00%                 1.00%
                   > Baa3, and
                   Level 1 does
                   not apply

Level 3
                   [less than] BBB-    2.25%                 1.25%
                   AND [less than]
                   Baa3

                  Notwithstanding the foregoing Pricing Grid, the Credit
Documentation will provide that if the senior, unsecured, non-credit enhanced
debt of the Borrower receives a rating of BBB or higher from Standard & Poor's
Ratings Group and a rating of Baa2 or higher from Moody's Investors Service,
Inc., the Applicable Margins applicable to Revolving Credit Loans and Tranche A
Term Loans shall be 1.50% for such Loans that are Eurodollar Loans and .50% for
such Loans that are Base Rate Loans; and such change in the Applicable Margins
shall become effective on the later of (i) the date on which the Borrower shall
have obtained both of such ratings and (ii) the first anniversary of the Closing
Date.



                                                                        Annex II

                           DESCRIPTION OF ACQUISITION

              White Mountains Insurance Group, Ltd., a company incorporated
in Bermuda ("WHITE MOUNTAINS"), together with investors previously identified
to the Arranger (the "INVESTOR GROUP"), will form a holding company (the
"PARENT"), which will in turn form an acquisition corporation ("ACQUISITION
CO.", or the "BORROWER"), which will then acquire (the "ACQUISITION") the
U.S. property and casualty insurance business (the "ACQUIRED ASSETS") of CGU
plc (the "SELLER"). The Acquisition will be consummated pursuant to the Stock
Purchase Agreement, dated as of September 24, 2000, among CGU International
Holdings Luxembourg S.A., a Luxembourg corporation, CGU Holdings LLC, a
Delaware limited liability company, Seller and White Mountains (the "STOCK
PURCHASE AGREEMENT"). The Acquisition will be accomplished through the
acquisition by the Borrower from the Seller of 100% of the equity interests
of CGU Corporation, a Delaware corporation ("CGU").

              Prior to or concurrently with the Acquisition, the following
transactions (the "PRE- CLOSING TRANSACTIONS") will occur:

                      (i) White Mountains will contribute to the Parent, which
       will in turn contribute to Acquisition Co., all of the outstanding shares
       of Folksamerica Holding Company, Inc., a New York company
       ("FOLKSAMERICA"), and White Mountains' interests in certain other
       insurance assets (collectively with Folksamerica, the "PARENT INSURANCE
       ASSETS");

                      (ii) CGU will exchange and/or contribute all of the shares
       of Commercial Union Insurance Company, a Massachusetts company, The
       Northern Assurance Company of America, a Massachusetts company, The
       Employers' Fire Insurance Company, a Massachusetts company, American
       Employers' Insurance Company, a Massachusetts company and Potomac
       Insurance Company of Illinois, an Illinois company, which are all
       first-tier subsidiaries of CGU, for (x) all of the shares of Pilot
       Insurance Company, a Canadian company ("PILOT"), a second-tier subsidiary
       of CGU, and (y) cash (the combined value of shares and cash to total an
       amount consistent with the Sources and Uses Table) (the Pilot shares are
       currently held by CGU Insurance Company, a Pennsylvania company
       ("CGUIC"), CGU Insurance Company of New Jersey, a New Jersey company
       ("CGUIC-NJ"), and General Accident Insurance Company, a Pennsylvania
       company ("GAIC"));

                      (iii) Acquisition Co. will transfer all of the Parent
       Insurance Assets to CGUIC;

                      (iv) CGU will sell all of the shares of Pilot to the
       Seller or an affiliate of Seller for cash;

                      (v) CGU Asset Management, Inc., a Delaware corporation and
       a subsidiary of CGU, will sell all of the outstanding shares of CGU
       Investment Management Canada Limited, a Canadian company, to a subsidiary
       of the Seller;

                      (vi) CGU will sell all of the outstanding shares of CGU
       Annuity Service Corporation, a Delaware corporation, and CGU Life
       Insurance Company of America, a Delaware corporation, to a newly-formed
       Delaware corporation that will be an indirect subsidiary of the Seller;





                      (vii) CGU will sell all of the outstanding shares of
       Societe Generale held by it to one or more subsidiaries of the Seller;
       and

                      (viii) the subsidiaries of CGU that hold shares of Munich
       Re will sell all of such shares to one or more subsidiaries of the
       Seller.

Cash and certain other proceeds of the sales and other dispositions contemplated
in clauses (v) through (viii) of the prior sentence will be applied towards the
repayment of the outstanding promissory note made by CGU to the Seller in the
outstanding principal amount of $1,100,000,000 (the "TERM NOTE"), which Term
Note will be repaid in full in connection with the Acquisition.

The aggregate purchase price (the "PURCHASE PRICE") payable by Acquisition Co.
to the Seller in connection with the Acquisition shall consist of (a) cash equal
to the sum of (1) an amount consistent with the Sources and Uses Table, (2) any
net income (loss) of CGU (net of (i) realized gains (losses) in CGU's and its
subsidiaries' fixed income portfolio and (ii) taxes) for the period from June 1,
2000 through August 31, 2000 and (3) the difference between (x) the amount of
unrealized gains (losses) on CGU's and its subsidiaries' investments in publicly
traded common equity securities (other than Societe Generale and Munich Re
shares) as of August 31, 2000 and (y) the amount of unrealized gains (losses) on
such common securities as of May 31, 2000 (in the case of each of (x) and (y),
net of taxes), and (b) a seller note in an aggregate principal amount consistent
with the Sources and Uses Table. The Purchase Price will be adjusted (up or
down) by the difference between the actual proceeds of the sales contemplated in
clauses (iv)-(viii) of the first sentence of the preceding paragraph and the
reference sales proceeds set forth in the Stock Purchase Agreement.