Exhibit 5.1


                                                               26 November 2003

Diageo Investment Corporation                                  Your reference
6 Landmark Square
Stamford                                                       Our reference
Connecticut 06901-2704                                         SRBP/ORK
United States of America                                       Direct line
                                                               020 7090 3452
Diageo Capital plc
Edinburgh Park
5 Lochside Way
Edinburgh EH12 9DT
United Kingdom

Diageo Finance B.V.
Molenwerf 10-12
1014 BG Amsterdam
The Netherlands

and

Diageo plc
8 Henrietta Place
London W1G 0NB
United Kingdom


Dear Sirs,

      U.S.$7,000,000,000 SHELF FOR THE ISSUE OF GUARANTEED DEBT SECURITIES
        ("GUARANTEED DEBT SECURITIES") BY DIAGEO INVESTMENT CORPORATION,
        DIAGEO CAPITAL PLC AND DIAGEO FINANCE B.V. (EACH AN "ISSUER" AND
         TOGETHER THE "ISSUERS") GUARANTEED AS TO PAYMENT OF PRINCIPAL,
       PREMIUM (IF ANY) AND INTEREST BY DIAGEO PLC (THE "GUARANTOR") AND
  FOR THE ISSUE BY THE GUARANTOR OF DEBT SECURITIES ("DIAGEO DEBT SECURITIES"
    AND, TOGETHER WITH GUARANTEED DEBT SECURITIES, "DEBT SECURITIES") AND OF
       WARRANTS ("WARRANTS"), PURCHASE CONTRACTS ("PURCHASE CONTRACTS"),
          UNITS ("UNITS"), PREFERENCE SHARES ("PREFERENCE SHARES") AND
          ORDINARY SHARES (TOGETHER WITH PREFERENCE SHARES, "SHARES")

          We have acted as English legal advisers to the Guarantor in connection
with the establishment of the above-mentioned shelf under which the Issuers may
from time to time issue Guaranteed Debt Securities on and subject to the terms
of the Diageo Capital Indenture (as defined below), the Diageo Investment
Indenture (as defined below) and the Diageo Finance Indenture (as defined below)
and under which the Guarantor may from time to time issue Diageo



Debt Securities on and subject to the terms of the Diageo Indenture (as defined
below), Warrants, Purchase Contracts, Units and Shares.

          This opinion is delivered in connection with the registration
statement in respect of the Securities on Form F-3 of the Issuers and the
Guarantor to be filed with the United States Securities and Exchange Commission
(the "SEC") on or around 26 November, 2003 (the "Registration Statement"). We
have not been concerned with investigating or verifying the facts set out in the
Registration Statement.

          For the purpose of this opinion, we have examined copies or drafts of
the following documents:

1.        the indenture dated 3 August 1998 entered into between Diageo Capital
          plc, the Guarantor and Citibank, N.A. (the "Diageo Capital Indenture")
          including the form of guarantees to be given by the Guarantor (the
          "Diageo Capital Guarantees");

2.        the indenture dated 1 June 1999 entered into between Diageo Investment
          Corporation, the Guarantor and Citibank, N.A. (the "Diageo Investment
          Indenture") including the form of guarantees to be given by the
          Guarantor (the "Diageo Investment Guarantees");

3.        the indenture to be entered into between Diageo Finance B.V., the
          Guarantor and Citibank N.A. (the "Diageo Finance Indenture") including
          the form of guarantees to be given by the Guarantor (the "Diageo
          Finance Guarantees" and together with the Diageo Capital Guarantees
          and the Diageo Investment Guarantees, (the "Guarantees"));

4.        the indenture to be entered into between the Guarantor and Citibank
          N.A. (the "Diageo Indenture" and, together with the Diageo Capital
          Indenture, the Diageo Investment Indenture and the Diageo Finance
          Indenture, the "Indentures") including the form of Diageo Debt
          Securities;

5.        copy of an extract from the minutes of a meeting of the board of
          directors of the Guarantor held on 30 October 2001 attached to the
          Secretary's Certificate referred to in paragraph 8 below;

6.        a copy of an extract from the minutes of the Finance Committee of the
          Guarantor held on 31 October 2001 attached to the Secretary's
          Certificate referred to in paragraph 8 below;

7.        a copy of an extract from the minutes of a meeting of the Standing
          Committee of the board of directors of the Guarantor held on 11
          November 2003 attached to the Secretary's Certificate referred to in
          paragraph 8 below;

8.        the secretary's certificate dated 26 November 2003 in respect of the
          Guarantor (the "Secretary's Certificate"); and



9.        entries shown on CH Direct print outs obtained by us from the
          Companies House database on 26 November 2003 of the file of the
          Guarantor maintained at the Companies House (the "Company Searches").

          This letter sets out our opinion on certain matters of the law of
England and Wales as at today's date. We have not made an investigation of, and
do not express any opinion on, any other law. This letter is to be construed in
accordance with the law of England and Wales.

          For the purposes of this letter we have assumed:

(i)       that the Diageo Indenture, the Guarantees and the Diageo Debt
          Securities in substantially the form examined by us will have been
          duly executed and delivered by the parties thereto;

(ii)      the conformity to original documents of all copy or draft documents
          examined by us and that the copy of the memorandum and articles of
          association of the Guarantor examined by us (which is attached to the
          Secretary's Certificate) is complete and accurate and conforms to the
          original;

(iii)     the Indentures, the Guarantees and the Diageo Debt Securities are
          valid and binding on the parties under the laws of the State of New
          York ("New York law") by which the Indentures, the Guarantees and the
          Diageo Debt Securities are expressed to be governed;

(iv)      that the Debt Securities will be duly issued, authenticated and
          delivered in accordance with the provisions of the relevant Indenture;

(v)       that each Issuer has the capacity, power and authority to effect the
          execution, delivery or issue of the Guaranteed Debt Securities;

(vi)      that no law of any jurisdiction outside England and Wales would render
          such execution, delivery or issue illegal or ineffective and that,
          insofar as any obligation under the Indentures, the Guarantees or the
          Diageo Debt Securities is performed in, or is otherwise subject to,
          any jurisdiction other than England and Wales, its performance will
          not be illegal or ineffective by virtue of the law of that
          jurisdiction;

(vii)     that the aggregate initial offering price of all Debt Securities,
          Warrants, Purchase Contracts, Units or Shares issued will not exceed
          the amount to be registered as set forth in the Registration Statement
          or in any additional registration statement filed pursuant to Rule
          462(b) under the United States Securities Act of 1933 (as amended)
          (the "Securities Act") and that each Debt Security will be in the form
          set out in Article Two of the relevant Indenture and will be subject
          to the terms and conditions of that Indenture;




(viii)    that the terms and conditions applicable to the Debt Securities,
          Warrants, Purchase Contracts, Units and Shares will not be
          inconsistent with the Registration Statement;

(ix)      that (1) the information disclosed by the Company Searches and by our
          telephone search on 26 November 2003 at the Central Registry of
          Winding-up Petitions in relation to the Guarantor was then complete,
          up-to-date and accurate and has not since then been altered or added
          to, (2) no petition for an administration order in respect of the
          Guarantor has been presented in any court in England and Wales and (3)
          the Company Searches and the telephone search did not fail to disclose
          any information relevant for the purposes of this opinion. It should
          be noted that the searches are not capable of revealing whether or not
          a petition for winding-up or administration has been presented in a
          County Court or District Registry or the High Court of Justice; notice
          of a winding-up or administration order made or winding-up resolution
          passed or receiver appointed may not be filed at Companies House
          immediately. However, the Secretary's Certificate confirms that to the
          Secretary's knowledge no such event had occurred as at 26 November
          2003;

(x)       that the minutes referred to in paragraphs 5, 6 and 7 above are a true
          record of the proceedings described therein of duly convened,
          constituted and conducted meetings of the Guarantor's board of
          directors (and of the Finance and Standing Committees thereof) acting
          in the interests and for a proper purpose of the Guarantor and that
          the relevant meeting was duly held and that the authorisations given
          thereat have not subsequently been amended, revoked or superseded and
          that, in making any subsequent decision, the directors of the
          Guarantor and any committee or person to whom they have delegated any
          such decision will act in the interests and for a proper purpose of
          the Guarantor;

(xi)      that the Indentures, the Guarantees and the Diageo Debt Securities are
          entered into by the Guarantor in good faith and in furtherance of its
          objects under its memorandum and articles;

(xii)     that the Indentures, the Guarantees and the Diageo Debt Securities are
          in the best interests and to the advantage of the Guarantor;

(xiii)    the accuracy and completeness of the statements made in the
          Secretary's Certificate;

(xiv)     that, for United Kingdom tax purposes, each of the Guarantor and
          Diageo Capital plc is resident in the United Kingdom and that interest
          and other amounts payable by Diageo Finance B.V. or Diageo Investment
          Corporation on debt instruments issued by them do not have a UK
          source;

(xv)      that, for United Kingdom tax purposes, Diageo Investment Corporation
          is resident in the United States of America, is not resident in the
          United Kingdom and does not have a branch or agency in the United
          Kingdom;



(xvi)     that, for United Kingdom tax purposes, Diageo Finance B.V. is resident
          in the Netherlands, is not resident in the United Kingdom and does not
          have a branch or agency in the United Kingdom;

(xvii)    that, in respect of each issue of Shares and of Warrants to purchase
          Shares ("Equity Warrants"), the Guarantor will have sufficient
          authorised but unissued share capital and the directors of the
          Guarantor will have been granted the necessary authority to allot the
          relevant Shares; and

(xviii)   that the Indentures, the Guarantees and the Diageo Debt Securities
          have the same meaning and effect as if they were governed by English
          law.

          Based on and subject to the foregoing and subject to the reservations
mentioned below and to any matters of fact not disclosed to us, we are of the
opinion that:

1.        The Guarantor is a public limited company duly incorporated under the
          laws of England and Wales and is a validly existing company.

2.        The Indentures have been duly authorised by the Guarantor. The Diageo
          Capital Indenture and the Diageo Investment Indenture have been, and
          when executed and delivered the Diageo Finance Indenture and the
          Diageo Indenture will be, duly executed and delivered by the
          Guarantor.

3.        On the assumption that the Diageo Capital Indenture and the Diageo
          Investment Indenture do, and that the Diageo Finance Indenture, the
          Diageo Indenture, the Guarantees and the Diageo Debt Securities will
          (when executed and delivered), create valid and binding obligations of
          the parties under New York law, English law will not prevent any
          provisions of the Diageo Capital Indenture and the Diageo Investment
          Indenture and, in the case of the Diageo Finance Indenture, the Diageo
          Indenture, the Guarantees and the Diageo Debt Securities, when
          executed and delivered, from being valid and binding obligations of
          the Guarantor.

4.        The statements in the Registration Statement in the eighth sentence of
          the section headed "Enforceability of Certain Civil Liabilities", in
          the last paragraph of the section headed "Description of Debt
          Securities and Guarantees - Payment of Additional Amounts" and in the
          sections headed "United Kingdom Taxation of Shares and ADSs" and
          "United Kingdom Taxation of Debt Securities", insofar as they are
          summaries of tax considerations or refer to statements of law or legal
          conclusions, in all material respects present fairly the information
          shown.

5.        When the Shares are issued and delivered against full payment therefor
          as contemplated in the Registration Statement and in conformity with
          the Guarantor's memorandum and articles of association and so as not
          to violate any applicable law, such Shares will have been validly
          issued and fully paid up and no further contributions




          in respect of such Shares will be required to be made to the Guarantor
          by the holders thereof, by reason solely of their being such holders.

6.        When (i) the equity warrant agreements relating to the Equity Warrants
          have been duly authorised, executed and delivered, (ii) the terms of
          the Equity Warrants and of their issuance and sale have been duly
          established in conformity with the Guarantor's memorandum and articles
          of association and so as not to violate any applicable law or breach
          of any agreement binding on the Guarantor and (iii) the applicable
          equity warrant agreements and the Equity Warrants have been duly
          executed and delivered, the Equity Warrants will constitute valid and
          binding obligations of the parties under English law.

7.        When (i) the Purchase Contracts have been duly authorised, executed
          and delivered and (ii) the terms of the Purchase Contracts and of
          their issuance and sale have been duly established in conformity
          with the Guarantor's memorandum and articles of association and so as
          not to violate any applicable law or breach of any agreement binding
          on the Guarantor, the Purchase Contracts will constitute valid and
          binding obligations of the parties under English law.

Our reservations are as follows:

I.        Undertakings, covenants and indemnities contained in the Indentures or
          the Guarantees may not be enforceable before an English court insofar
          as they purport to require payment or reimbursement of the costs of
          any unsuccessful litigation brought before an English court.

II.       Insofar as any obligation under the Indentures, the Guarantees or the
          Diageo Debt Securities is to be performed in any jurisdiction other
          than England and Wales, an English court may have to have regard to
          the law of that jurisdiction in relation to the manner of performance
          and the steps to be taken in the event of defective performance.

III.      We express no opinion as to whether specific performance, injunctive
          relief or any other form of equitable remedy would be available in
          respect of any obligation of the Guarantor under or in respect of the
          Indentures, the Guarantees or the Diageo Debt Securities.

IV.       The obligations of the Guarantor under or in respect of the
          Indentures, the Guarantees and the Diageo Debt Securities will be
          subject to any law from time to time in force relating to liquidation
          or administration or any other law or legal procedure affecting
          generally the enforcement of creditors' rights.

V.        In our opinion under English law there is doubt as to the
          enforceability in the United Kingdom, in original actions or in
          actions for enforcement of judgments of United States courts, of civil
          liabilities predicated solely upon the United States Federal or State
          securities laws.

          This opinion is addressed to you in connection with the filing of the
Registration Statement.

          We consent to the references to our name and opinion under the
captions "Enforceability of Certain Civil Liabilities", "Taxation - United
Kingdom Taxation" and "Validity of Securities" in the Registration Statement. In
giving this consent, we do not admit that we are within the category of




persons whose consent is required within section 7 of the Securities Act or the
rules and regulations of the SEC thereunder.


Yours faithfully,


Slaughter and May