EXHIBIT 99.1
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May 1, 2007


Dear Trenwick Group Limited Shareholders

Further to our previous annual update to the  shareholders of the Company dated
30 March 2006 filed with the US Securities and Exchange  Commission  ("SEC") on
Form  8-K,  we are  writing  to  briefly  update  you on  the  progress  of the
liquidation of Trenwick Group Ltd ("the Company") over the last year.

1.  COMPANY BACKGROUND

In August 2003, insolvency proceedings were initiated in both the United States
and Bermuda.  The Supreme Court of Bermuda  ordered that Michael  Morrison,  of
KPMG Financial  Advisory Services Limited in Bermuda,  and John Wardrop of KPMG
LLP in England be appointed Joint  Provisional  Liquidators to the Company (the
"Joint Provisional  Liquidators") and the Company's subsidiary company, LaSalle
Re Holdings Limited ("LSRH").

Concurrently  Trenwick America Corporation ("TAC"),  along with the Company and
LSRH,  filed voluntary  petitions for relief under chapter 11 of the Bankruptcy
Code with the United States  Bankruptcy Court for the District of Delaware (the
"Bankruptcy  Court"),  to run in parallel with the  provisional  liquidation in
Bermuda.  In 2003 and  2004,  the  Bankruptcy  Court  approved  the sale of the
Company's former UK based affiliates and the reorganization of TAC, the holding
company of the Company's US insurance entities,  pursuant to which these former
affiliates were separated and are no longer  affiliated in any respect with the
Company  or  LSRH.  Since  there  were  insufficient   assets  to  support  the
reorganization  of the Company and LSRH,  the  Bankruptcy  Court  dismissed the
Company and LSRH from the US  proceedings  in 2004 in  deference to the ongoing
Bermudian liquidation proceedings.

Following  the  dismissal  of their  chapter  11 cases  the  Joint  Provisional
Liquidators  of the Company and LSRH filed  petitions  under section 304 of the
Bankruptcy  Code and  applications  for  certain  injunctive  relief  (the "304
Petitions") with the Bankruptcy Court. The impetus behind the 304 Petitions was
to  investigate,  and, if appropriate,  prosecute  various claims and causes of
action that might exist in favour of the Company and LSRH. The relief sought in
the 304 Petitions was granted by court orders dated 26 May 2005.

The Company was placed into  liquidation  by the Supreme  Court of Bermuda on 4
November  2005 and LSRH was placed into  liquidation  by the  Supreme  Court of
Bermuda on 15 April 2005.

2.  CURRENT POSITION

The first meeting of the Company's creditors and contributories (the "Meeting")
was held on 28 April 2006, at the Company's  registered office, to consider and
to vote on:

a)  who should be appointed as the permanent liquidator of the Company; and

b)  whether a formal  committee of inspection  should be appointed  and, if so,
who should be a member of said committee of inspection.



Following the  Meetings,  by Order of the Supreme Court of Bermuda dated May 18
2006,  it was ordered that Mike Morrison and John Wardrop be appointed as Joint
Liquidators of the Company without a Committee of Inspection.

3. DUTIES AND FUNCTION OF THE JOINT LIQUIDATORS

Shareholders  of the Company  should  note that the  primary  duty of the Joint
Liquidators is to the Company's creditors.

The  function  of the Joint  Liquidators  will be to realise  the assets of the
Company and, ultimately,  distribute such assets to the Company's creditors. In
the event  that a surplus  remains  after the  distributions  to the  Company's
creditors are made, the permanent  liquidator  shall distribute such surplus to
the Company's equity security holders.

4.  MAJOR ASSETS & TIMING OF CLOSURE OF LIQUIDATION

The Company  currently has no unencumbered  cash assets with which to cover the
liquidation  expenses and therefore  the costs and expenses of the  liquidation
are being funded primarily by the Company's creditors.

The timing of the  completion of the Company's  liquidation is dependent on the
realisation  of its  assets,  the  principal  asset  being the  Company's  100%
ordinary voting shareholder interest in LSRH whose principal asset, in turn, is
its 100% ordinary voting shareholder  interest in its subsidiary LaSalle Re Ltd
("LaSalle").

4.1 LaSalle

LaSalle is a Bermudian Class 4 registered  reinsurance company that has been in
run-off since 2002. As at December 31, 2006 LaSalle's  unaudited  balance sheet
showed shareholders' funds of approximately  US$25.2 million.  LaSalle also has
an economic  interest in its  underwriting  subsidiaries  at Lloyd's of London.
LaSalle  has not been in  compliance  with  the  Bermudian  insurance  solvency
regulations  and therefore is currently not  authorised to pay any dividends to
its  parent  until  such  time  it  has  extinguished  its  current   insurance
liabilities.  Absent any accelerated closure mechanism, it is possible that the
normal  course  run-off  of LaSalle  would  continue  for at least five  years.
However, as an accelerated closure mechanism,  LaSalle has proposed a Scheme of
Arrangement  under Section 99 of the Bermuda  Companies Act 1981 (the "Scheme")
with its creditors.

The Scheme was approved by LaSalle's  creditors and was sanctioned by the Court
on April 27, 2007. Now that the Scheme has been  implemented it will materially
shorten  the time  necessary  to  finalise  LaSalle's  closure.  The  Scheme is
expected to terminate LaSalle's  remaining insurance  liabilities by the end of
2007,  after which it should be possible to  distribute  LaSalle's  shareholder
surplus to the  Company in the first  half of 2008.  The exact  quantum of this
distribution  from LaSalle will be dependant on the level of claims received by
LaSalle in the Scheme and the underlying value of LaSalle's  economic  interest
in its underwriting subsidiaries at Lloyd's of London.

It should be noted that the Company would only receive  dividends  from LSRH in
the event that there is a surplus of available  funds  following the payment of
LSRH's liquidation expenses and the full satisfaction of each of the claims and
interests held by LSRH's creditors and preference shareholders.



4.2 Senior notes issued by Trenwick America Corp

In the Joint Provisional Liquidators annual update to shareholders, dated March
2006, it was advised that the Company's  subsidiary Trenwick Bermuda ("TB") had
asserted a $23 million inter-company claim in TAC's chapter 11 case. This claim
was the subject of an objection (the "Objection"),  filed by the post-Effective
Date successor entity to TAC's Official  Committee of Unsecured  Creditors (the
"TAC  Litigation  Trust").   The  Objection  sought,  among  other  things,  to
recharacterize  the claim as equity  or, in the  alternative,  to  disallow  or
equitably subordinate the claim.

The Joint Provisional  Liquidators reached a compromise with the TAC Litigation
Trust during the year. The compromise was for a  consideration  of US$5 million
in the form of senior notes issued by reorganized TAC and receivable by TB. The
US$5  million in senior  notes have been  assigned  by TB to the  Company  (the
"Senior Notes"). The compromise between the Company and TAC was approved by the
Supreme  Court of Bermuda by an Order dated April 6, 2006 and  subsequently  by
the United  States  Bankruptcy  Court for the  District of Delaware by an Order
dated May 15, 2006.

The  liquidation  of the Company  cannot be completed  until the earlier of the
date that all possible realisations from LaSalle and certain other subsidiaries
has been  received,  or all of the Company's  creditors have been paid in full.
Given  the   inherent   uncertainty   surrounding   the   outcome  of  the  TAC
reorganisation,  it is very difficult to determine  whether TAC will be able to
make any distributions in respect of the Senior Notes.

5.  THE COMPANY'S CREDITORS

The Company and LSRH issued  guarantees and pledged  security to a syndicate of
banks  (the "LoC Bank  Group")  which  provided  letters  of credit to  support
Trenwick's  underwriting at Lloyd's of London.  Based on the limited  currently
available information,  the Joint Liquidators understand that it is likely that
a portion of the  letters of credit will be drawn down and that  therefore  the
LoC Bank Group will rank as  creditors  against the  Company and LSRH.  The LoC
Bank Group's  collateral package formerly included the Company's shares in LSRH
and LSRH's  shares in LaSalle,  all of which were pledged to the LoC Bank Group
as security for the aforementioned letters of credit.  However, in 2006 the LoC
Bank Group notified the Joint  Provisional  Liquidators  of their  intention to
cancel their security over the Company and LSRH.

6.  MAJOR LIABILITIES - PREFERRED SHARES

The Joint  Liquidators  understand  that LSRH  Series A  Preferred  Shares  are
entitled  to receive (i) a  preference  dividend  in a  liquidation  of $25 per
share, and (ii) accrued but unpaid dividends in a liquidation prior to payments
to other  shareholders.  However,  these amounts are only payable to the extent
that there are assets  remaining  following  the payment of LSRH's  liquidation
expenses  and  the  full  satisfaction  of each of the  claims  held by  LSRH's
creditors (including the LoC Bank Group).  Nevertheless,  the Joint Liquidators
recognize  that,  should  there be any  funds  available  for  distribution  to
shareholders  of LSRH in a  liquidation,  holders  of LSRH  Series A  Preferred
Shares would hold a priority  position over LSRH's common  shareholders  to the
extent described above.

7.  PROSPECTS FOR HOLDERS OF COMMON SHARES OF THE COMPANY

Based on what the Joint  Liquidators  have  learned in their role to date,  and
without  conducting any  investigation  into the issue,  it is uncertain to the
Joint  Liquidators that the holders of the Company's common shares will receive
any distribution from the liquidation of the Company.

8.  FUTURE REPORTING

The  Joint  Liquidators  intend  to  continue  to limit  the  Company's  public
announcements  in the  future to  material  events  relating  to the  Company's
winding-up (liquidation) proceedings in Bermuda. We intend to disclose any such
event to the public by filing with the US  Securities  and Exchange  Commission
("SEC") a current report on Form 8-K. Subject to the resources available to the
Company,  we expect to provide an update on the status of the Company's affairs
at  least  annually.  Reports  on the  Company's  affairs  are  not  mailed  to
shareholders  of the  Company,  unless  we are  required  to do so or unless we
believe, in our sole judgment, that it is in the best interest of the Company's
shareholders.

The Company's  current  reports on Form 8-K are available free of charge at the
SEC's website WWW.SEC.GOV.

We hope that the background provided in this letter is useful to you.

Yours faithfully                                Yours faithfully



/s/ Mike Morrison                               /s/ John Wardrop
- ---------------------------                     -------------------------------
Mike Morrison                                   John Wardrop
Joint Liquidator                                Joint Liquidator