Document:

EXHIBIT 4
To:      Amerada Hess Corporation plc ("Amerada Hess")

and      Goldman Sachs International ("Goldman Sachs")

                                                                 6 November 2000

Dear Sirs,

I  understand  that  Amerada  Hess  intends to make an offer to acquire  all the
issued ordinary share capital of Linda plc ("Linda")  substantially on the terms
of the  attached  draft press  announcement.  This letter sets out the terms and
conditions  on which I will accept the Offer (as defined in  paragraph 7 of this
undertaking) when it is made.

Shareholdings

1.  I represent and warrant to Amerada Hess that:

(a)    I am the registered holder and beneficial owner of the number of ordinary
       shares  of 25p  each  in the  capital  of  Linda  shown  in Part A of the
       Schedule  (the  "Linda  Shares")  and that I hold these free of any lien,
       charge, option, equity or encumbrance and free from any third party right
       or interest;

(b)    I am the beneficial  owner (but not  registered  holder) of the number of
       ordinary  shares of 25p each in the  capital of Linda  shown in Part B of
       the Schedule (the "Beneficial  Shares") and that I hold these free of any
       lien, charge, option, equity or encumbrance and free from any third party
       right or interest;

(c)    the information set out in the Schedule  regarding the shares of Linda in
       which I am interested is complete and accurate;

(d)    the  Schedule  contains  complete  and  accurate  details of all options,
       warrants  and  other  rights I may have to  subscribe  for,  purchase  or
       otherwise acquire any securities of Linda; and

(e)    I have full  power and  authority  to enter  into  this  undertaking,  to
       perform  the  obligations  under it and to accept the Offer in respect of
       the Linda shares.

Dealings
2.  I  undertake to  Amerada  Hess that  before the Offer  closes,  lapses or is
withdrawn, I shall not:

(a)    sell,  transfer,  charge,  encumber,  grant any option over or  otherwise
       dispose of any Linda Shares or any Beneficial  Shares or any other shares
       or  securities  in Linda  issued  or  unconditionally  allotted  to me or
       otherwise  acquired by me before then ("Further Linda Shares") other than
       pursuant to my acceptance of the Offer;

(b)    accept any other offer in respect of the shares or securities referred to
       in paragraph 2(a);

(c)    (other  than   pursuant  to  the  Offer)  enter  into  any  agreement  or
       arrangement  or permit any agreement or arrangement to be entered into or
       incur any obligation or permit any obligation to arise:

              (i)    to do any of the acts  referred  to in  paragraphs  2(a) or
                     2(b);

              (ii)   in relation to, or  operating  by  reference  to, the Linda
                     Shares,  the Beneficial Shares or any Further Linda Shares;
                     or

              (iii)  which,  in relation  to the Linda  Shares,  the  Beneficial
                     Shares or any Further Linda Shares, would or might restrict
                     or impede me accepting the Offer,

       and for the avoidance of doubt,  references in this paragraph 2(c) to any
       agreement,  arrangement or obligation includes any agreement, arrangement
       or obligation  whether or not legally binding or subject to any condition
       or which is to take  effect  if the  Offer  closes  or  lapses or if this
       undertaking ceases to be binding or following any other event; or

(d)    save for the  acquisition  of any further shares in Linda on the exercise
       of options  referred to in Part C of the Schedule,  I shall not purchase,
       sell or  otherwise  deal in any  shares or other  securities  of Linda or
       Amerada  Hess  or  any  interest   therein   (including  any  derivatives
       referenced to such securities).

Undertaking to accept the Offer
3.  In  consideration  of Amerada  Hess's agreement in paragraph 9.1 to make the
Offer, I undertake to Amerada Hess that:

(a)    I shall  accept the Offer in respect  of the Linda  Shares in  accordance
       with  the  procedure  for  acceptance  set  out  in the  formal  document
       containing  the Offer (the  "Offer  Document")  not later than seven days
       after  Amerada Hess posts the Offer  Document to Linda  shareholders  and
       shall  perform the  agreement  to which that  acceptance  gives rise,  in
       accordance with the relevant provisions of the Offer Document;

(b)    I shall take all action  within my power to procure  that the  registered
       holder of the Beneficial  Securities accepts the Offer in accordance with
       the relevant  provisions of the Offer Document and performs the agreement
       to which that  acceptance  gives rise,  in  accordance  with the relevant
       provisions of the Offer Document;

(c)    I shall  accept  the Offer in  respect  of any  Further  Linda  Shares in
       accordance  with  the  procedure  for  acceptance  set  out in the  Offer
       Document  not later than two days after the date I become the  registered
       holder of the Further  Linda  Shares and shall  perform the  agreement to
       which  that  acceptance  gives  rise,  in  accordance  with the  relevant
       provisions of the Offer Document;

(d)    I shall take all action  within my power to procure  that the  registered
       holder  of any  further  ordinary  shares  in Linda in which I  acquire a
       beneficial  interest after the date of this undertaking but of which I do
       not become the registered  holder ("Further  Beneficial  Shares") accepts
       the offer and performs the agreement to which that acceptance  gives rise
       in accordance with the relevant provisions of the Offer Document.

(e)    I shall not  withdraw  any  acceptances  of the Offer and shall cause the
       registered  holder(s) of any Beneficial Shares and any Further Beneficial
       Shares not to do so; and

(f)    pursuant to the Offer,  Amerada Hess will acquire the Linda  Shares,  the
       Beneficial  Shares and any Further Linda Shares from me free of any lien,
       charge, option, equity or encumbrance and together with all rights of any
       nature  attaching to those shares  including  the right to all  dividends
       declared or paid after the date of this undertaking.

Voting Rights
4.1 From the time Amerada Hess announces the Offer to the time the Offer becomes
wholly unconditional, lapses or is withdrawn:

(a)    I shall  exercise the votes  attaching to my Linda Shares and any Further
       Linda Shares on a Relevant  Resolution (as defined in paragraph 4.3) only
       in accordance with Amerada Hess's directions;

(b)    I shall exercise the rights  attaching to my Linda Shares and any Further
       Linda  Shares to  requisition  or join in  requisitioning  any general or
       class  meeting  of Linda  for the  purposes  of  considering  a  Relevant
       Resolution  and to require  Linda  pursuant to section 376  Companies Act
       1985 to give notice of such a resolution  only in accordance with Amerada
       Hess's directions;

(c)    I shall cause the registered  holder(s) of any Beneficial  Shares and any
       Further Beneficial Shares to comply with paragraphs 4.1(a) and 4.1(b).

4.2  For the  purpose  of  voting  or  causing  votes  to be cast on a  Relevant
Resolution,  I shall  execute  any  form  of  proxy  required  by  Amerada  Hess
appointing  any  person  nominated  by  Amerada  Hess to attend  and vote at the
relevant general meeting of Linda .

4.3  A "Relevant Resolution" means:

(a)    a  resolution  (whether  or not  amended)  proposed at a general or class
       meeting of Linda,  or at an  adjourned  meeting,  the passing of which is
       necessary to implement the Offer or which, if passed, might result in any
       condition  of the Offer  not being  fulfilled  or which  might  impede or
       frustrate the Offer in any way;

(b)    a  resolution  to  adjourn  a general  or class  meeting  of Linda  whose
       business  includes  the  consideration  of a  resolution  falling  within
       paragraph 4.3(a); and

(c)    a resolution to amend a resolution  falling  within  paragraph  4.3(a) or
       paragraph 4.3(b).

Documentation
5.1  I consent to:

(a)    the inclusion of references to me and this  undertaking in Amerada Hess's
       announcement  of the Offer (the "Press  Announcement")  as they appear in
       the attached draft of the Press Announcement;

(b)    particulars  of this  undertaking  and my holdings  of, and  dealings in,
       relevant securities of Linda and Amerada Hess being included in the Offer
       Document and any other  related or ancillary  document as required by the
       Code; and

(c)    this  undertaking  being  available for  inspection  until the end of the
       offer period (as defined in the Code).

5.2  I shall promptly  give you all  information  and any  assistance as you may
reasonably require for the preparation of the Offer Document and all related and
ancillary  documents in order to comply with the  requirements  of the Code, the
Financial  Services  Authority and the London Stock Exchange and any other legal
or regulatory  requirement or body. I shall immediately notify you in writing of
any  material  change in the  accuracy or impact of any  information  previously
given to you.

Secrecy
6. I will keep secret the possibility, terms and conditions of the Offer and the
existence and terms of this undertaking until the Press Announcement is released
provided  that I may disclose the same to Linda and its advisers in which case I
will use reasonable  endeavours to ensure that they observe  secrecy in the same
terms.  The  obligations  in this  paragraph  will survive  termination  of this
undertaking.

Interpretation
7. In this undertaking the "Offer" means the offer to be made by or on behalf of
Amerada Hess to acquire  ordinary  shares of 25p each in the capital of Linda on
substantially the terms of the Press  Announcement or on such other terms as may
be agreed  between  Amerada  Hess and Linda or as may be required to comply with
the  requirements  of the Panel on  Takeovers  and Mergers  (the  "Panel"),  the
Financial Services  Authority or the London Stock Exchange.  A reference in this
undertaking to the "Offer" also includes any new, increased,  renewed or revised
offer made by or on behalf of Amerada Hess to acquire shares in Linda,  provided
that the terms of such offer are,  in the  opinion  of  Goldman  Sachs,  no less
favourable to acceptors than the terms set out in the Press Announcement.

Time of the Essence
8. Any time,  date or period  mentioned in this  undertaking  may be extended by
mutual agreement but as regards any time, date or period  originally fixed or as
extended, time shall be of the essence.

The Offer
9.1 Subject to paragraph 9.2, Amerada Hess agrees to make the Offer if the Press
Announcement is published,  with Amerada Hess's prior approval, in substantially
the form attached (or in such other form as may be agreed  between  Amerada Hess
and LASMO or as may be required to comply with the  requirements of the Panel on
Takeovers and Mergers (the "Panel")) by not later than 8 November 2000. Approval
of  the  release  of  the  Press  Announcement  is at  Amerada  Hess's  absolute
discretion.

9.2 Amerada Hess will not be obliged to make or proceed with the Offer if, after
the Press Announcement is published:

(a)    the Panel consents to Amerada Hess not proceeding with the Offer; or

(b)    Amerada  Hess is no longer  required  by the City Code of  Takeovers  and
       Mergers (the "Code") to proceed with the Offer.

9.3  Amerada  Hess  shall  have no  liability  to me for any  failure to make or
implement the Offer and I will not be entitled to specific performance of Clause
9.1 if, in each case,  Amerada Hess has become  aware that any  condition of the
Offer  as set out in the  Press  Announcement  has  become  incapable  of  being
fulfilled.

9.4  My obligations under this agreement will lapse if:

(a)    the Press Announcement is not released on 8 November 2000; or

(b)    the Offer is not made or Amerada  Hess does not proceed with the offer in
       any of the circumstances referred to in paragraph 9.2,

and in these  circumstances  neither party will have any claim against the other
except in respect of any prior breach.

If the undertaking lapses, I shall have no claim against Amerada Hess.

Director's undertakings
10.1  As a director  of Linda,  I shall use my best endeavours  to procure  that
Linda and the board of directors of Linda:

(a)    provide all assistance  which Amerada Hess reasonably  requests to enable
       it to prepare the Offer Document and all related and ancillary  documents
       in accordance  with the  requirements of the Code, the SEC, the Financial
       Services  Authority and the London Stock  Exchange and any other legal or
       regulatory requirement or body;

(b)    provide all assistance which Amerada Hess reasonably  requests to Amerada
       Hess as may be required to obtain the clearances and consents referred to
       in the Press Announcement;

(c)    if the Offer becomes unconditional in all respects,  promptly approve the
       appointment as  director(s) of Linda of the persons  nominated by Amerada
       Hess and, if required by Amerada  Hess,  I shall  resign as a director of
       Linda ;

(d)    agree to any  extension  of time  limits in the Code for  posting of this
       Offer which Amerada Hess requests and which the Panel approves; and

(e)    not make (and that no-one makes on behalf of Linda):

              (i)    any announcement  before the Press Announcement is released
                     which refers expressly or implicitly to Amerada Hess; or

              (ii)   any other announcement in connection with the Offer without
                     prior consultation with Amerada Hess,

         unless Amerada Hess consents in writing or the relevant announcement is
         required by law or any regulatory provision.

10.2  I shall:

(a)    not directly or indirectly  solicit any person other than Amerada Hess to
       propose or announce any offer for or any scheme of arrangement in respect
       of any shares or other securities of Linda; or

(b)    not directly or indirectly  initiate any discussions with, or provide any
       information  to,  any person who is or may be  considering  proposing  or
       announcing such an offer or scheme; or

(c)    recommend  acceptance of the Offer to Linda  shareholders and not modify,
       qualify or withdraw that recommendation at any time, except insofar as to
       do so would be inconsistent with my duties as a Director of LASMO.

10.3 I shall promptly inform you of any approach by a third party which may lead
to an offer for Linda or the occurrence of any matter referred to above and will
keep you  fully  informed  of the same  (but  not of the  value of the  relevant
proposal or the identity of its proponent).

10.4 I confirm  that I know of no matter or  circumstance  which might mean that
any  condition  of the  Offer  set  out  in the  Press  Announcement  cannot  be
fulfilled.  I will  have  no  liability  to  Amerada  Hess  in  respect  of this
confirmation.

Confirmation
11. I confirm that in signing  this letter I am not a customer of Goldman  Sachs
for the purposes of the Rules of The Securities  and Futures  Authority and that
Goldman Sachs does not owe me any of the duties which it owes to its  customers.
I confirm that I have had an adequate  opportunity to consider whether or not to
give this undertaking and to obtain independent advice.

Power of Attorney
12.1  In  order  to  secure  the  performance  of  my  obligations   under  this
undertaking, I appoint any director of Amerada Hess as my attorney:

(a)    if I fail to accept or to procure  acceptance  of the Offer in accordance
       with  paragraphs  3(a),  3(b) or 3(c) or if I fail to  accept  the  offer
       referred to in paragraph 3(d) in accordance  with that  paragraph,  in my
       name and on my behalf to do all things and to execute all deeds and other
       documents  as may be  necessary  or  desirable  to accept  such offers in
       respect of the Linda Shares,  the  Beneficial  Shares,  any Further Linda
       Shares and the options  referred to in paragraph  3(d) (as  appropriate);
       and

(b)    to execute any form of proxy  required  by Amerada  Hess  appointing  any
       person  nominated  by  Amerada  Hess to  attend  and  vote on a  Relevant
       Resolution (as defined in paragraph 4.3) at a general meeting of Linda.

12.2 I agree  that this power of  attorney  is given by way of  security  and is
irrevocable  in accordance  with section 4 Powers of Attorney Act 1971 until the
Offer closes, lapses or is withdrawn.

Specific Performance
13. I agree  that,  if I fail to  accept  the  Offer  in  accordance  with  this
undertaking  or breach any of my  obligations,  damages would not be an adequate
remedy and accordingly  Amerada Hess shall be entitled to the remedy of specific
performance.

14.      General
14.1 The obligations I have accepted under this agreement are without  prejudice
to any  rights  of  Amerada  Hess or  Goldman  Sachs at  common  law or  equity.
Invalidity  of any  provision  of this  agreement  will  not  affect  any  other
provision.

14.2 Any  failure  or delay by any  person in  exercising  any  right,  power or
privilege  under  this  agreement  will not  comprise  a waiver  and a single or
partial exercise will not restrict any further exercise.

14.3 This  agreement is governed by and is to be construed  in  accordance  with
English law and each of the parties submits to the exclusive jurisdiction of the
English courts for all purposes in connection with this agreement.

<PAGE>

                                    SCHEDULE

                                 EXISTING SHARES

PART A - REGISTERED HOLDINGS OF LINDA ORDINARY SHARES

REGISTERED HOLDER                                             ORDINARY SHARES OF
                                                              25P EACH
(Print name of giver of
undertaking)

THIERRY HUGHES BAUDOUIN

JEAN BAPTISTE DE RUDDER

<PAGE>

SIGNED and DELIVERED as a DEED by                       THIERRY HUGHES BAUDOMIAS
                                                        JEAN BAPTISTE DE RHODER

Yours faithfully,

Signature                                            THIERRY HUGHES BAUDOMIAS

Name                                                 THIERRY HUGHES BAUDOMIAS

in the presence of:

Signature of witness:      MICHELE DE RUDDER

Name                       MICHELE DE RUDDER

Address                    6 AVENUE DE BECASSES
                           1640 RHODE ST. GENESE
                           BELGIUMEXHIBIT 5
To:      Amerada Hess Corporation plc ("Amerada Hess")

and      Goldman Sachs International ("Goldman Sachs")

                                                               6 November 2000

Dear Sirs,

I  understand  that  Amerada  Hess  intends to make an offer to acquire  all the
issued ordinary share capital of Linda plc ("Linda")  substantially on the terms
of the  attached  draft press  announcement.  This letter sets out the terms and
conditions  on which I will accept the Offer (as defined in  paragraph 7 of this
undertaking) when it is made.

Shareholdings
1.        I represent and warrant to Amerada Hess that:

(a)       I am the  registered  holder  and  beneficial  owner of the  number of
          ordinary shares of 25p each in the capital of Linda shown in Part A of
          the  Schedule  (the "Linda  Shares") and that I hold these free of any
          lien,  charge,  option,  equity or encumbrance and free from any third
          party right or interest;

(b)       I am the beneficial owner (but not registered holder) of the number of
          ordinary shares of 25p each in the capital of Linda shown in Part B of
          the Schedule (the  "Beneficial  Shares") and that I hold these free of
          any lien,  charge,  option,  equity or  encumbrance  and free from any
          third party right or interest;

(c)       the information set out in the Schedule  regarding the shares of Linda
          in which I am interested is complete and accurate;

(d)       the Schedule  contains  complete and accurate  details of all options,
          warrants  and other rights I may have to  subscribe  for,  purchase or
          otherwise acquire any securities of Linda; and

(e)       I have full power and  authority  to enter into this  undertaking,  to
          perform the obligations under it and to accept the Offer in respect of
          the Linda shares.

Dealings
2.       I undertake to Amerada Hess that before the Offer closes, lapses  or is
withdrawn, I shall not:

(a)      sell, transfer,  charge,  encumber,  grant any option over or otherwise
         dispose  of any  Linda  Shares  or any  Beneficial  Shares or any other
         shares or securities in Linda issued or unconditionally  allotted to me
         or otherwise  acquired by me before then ("Further Linda Shares") other
         than pursuant to my acceptance of the Offer;

(b)       accept any other offer in respect of the shares or securities referred
          to in paragraph 2(a);

(c)       (other  than  pursuant  to the  Offer)  enter  into any  agreement  or
          arrangement  or permit any agreement or arrangement to be entered into
          or incur any obligation or permit any obligation to arise:

          (i)       to do any of the  acts  referred  to in  paragraphs  2(a) or
                    2(b);

          (ii)      in relation  to, or  operating  by  reference  to, the Linda
                    Shares,  the Beneficial  Shares or any Further Linda Shares;
                    or

          (iii)     which,  in  relation  to the Linda  Shares,  the  Beneficial
                    Shares or any Further Linda Shares,  would or might restrict
                    or impede me accepting the Offer,

          and for the avoidance of doubt,  references in this  paragraph 2(c) to
          any  agreement,  arrangement  or  obligation  includes any  agreement,
          arrangement or obligation whether or not legally binding or subject to
          any condition or which is to take effect if the Offer closes or lapses
          or if this  undertaking  ceases to be binding or  following  any other
          event; or

(d)       save  for the  acquisition  of any  further  shares  in  Linda  on the
          exercise of options referred to in Part C of the Schedule, I shall not
          purchase,  sell or otherwise deal in any shares or other securities of
          Linda  or  Amerada  Hess  or  any  interest  therein   (including  any
          derivatives referenced to such securities).

Undertaking to accept the Offer
3.       In  consideration  of Amerada Hess's agreement in paragraph 9.1 to make
the Offer, I undertake to Amerada Hess that:

(a)       I shall accept the Offer in respect of the Linda Shares in  accordance
          with the  procedure  for  acceptance  set out in the  formal  document
          containing the Offer (the "Offer  Document") not later than seven days
          after Amerada Hess posts the Offer Document to Linda  shareholders and
          shall  perform the agreement to which that  acceptance  gives rise, in
          accordance with the relevant provisions of the Offer Document;

(b)       I shall take all action within my power to procure that the registered
          holder of the  Beneficial  Securities  accepts the Offer in accordance
          with the relevant  provisions  of the Offer  Document and performs the
          agreement to which that acceptance  gives rise, in accordance with the
          relevant provisions of the Offer Document;

(c)       I shall  accept the Offer in respect of any  Further  Linda  Shares in
          accordance  with the  procedure  for  acceptance  set out in the Offer
          Document  not  later  than  two  days  after  the  date I  become  the
          registered  holder of the Further  Linda Shares and shall  perform the
          agreement to which that acceptance  gives rise, in accordance with the
          relevant provisons of the Offer Document;

(d)       I shall take all action within my power to procure that the registered
          holder of any  further  ordinary  shares in Linda in which I acquire a
          beneficial  interest after the date of this undertaking but of which I
          do not become the  registered  holder  ("Further  Beneficial  Shares")
          accepts the offer and performs the agreement to which that  acceptance
          gives rise in  accordance  with the relevant  provisions  of the Offer
          Document.

(e)       I shall not withdraw any  acceptances of the Offer and shall cause the
          registered   holder(s)  of  any  Beneficial  Shares  and  any  Further
          Beneficial Shares not to do so; and

(f)       pursuant to the Offer, Amerada Hess will acquire the Linda Shares, the
          Beneficial  Shares and any  Further  Linda  Shares from me free of any
          lien,  charge,  option,  equity or  encumbrance  and together with all
          rights of any nature  attaching to those shares including the right to
          all dividends declared or paid after the date of this undertaking.

Voting Rights
4.1 From the time Amerada Hess announces the Offer to the time the Offer becomes
wholly unconditional, lapses or is withdrawn:

(a)       I shall  exercise  the  votes  attaching  to my Linda  Shares  and any
          Further Linda Shares on a Relevant Resolution (as defined in paragraph
          4.3) only in accordance with Amerada Hess's directions;

(b)       I shall  exercise  the  rights  attaching  to my Linda  Shares and any
          Further  Linda Shares to  requisition  or join in  requisitioning  any
          general or class  meeting of Linda for the purposes of  considering  a
          Relevant  Resolution  and to require  Linda  pursuant  to section  376
          Companies  Act  1985  to give  notice  of  such a  resolution  only in
          accordance with Amerada Hess's directions;

(c)       I shall cause the registered  holder(s) of any  Beneficial  Shares and
          any Further  Beneficial  Shares to comply with  paragraphs  4.1(a) and
          4.1(b).

4.2  For the  purpose  of  voting  or  causing  votes  to be cast on a  Relevant
Resolution,  I shall  execute  any  form  of  proxy  required  by  Amerada  Hess
appointing  any  person  nominated  by  Amerada  Hess to attend  and vote at the
relevant general meeting of Linda .

4.3      A "Relevant Resolution" means:

(a)       a resolution  (whether or not amended)  proposed at a general or class
          meeting of Linda, or at an adjourned meeting,  the passing of which is
          necessary to implement the Offer or which, if passed,  might result in
          any  condition of the Offer not being  fulfilled or which might impede
          or frustrate the Offer in any way;

(b)       a  resolution  to  adjourn a general or class  meeting of Linda  whose
          business  includes the  consideration  of a resolution  falling within
          paragraph 4.3(a); and

(c)       a resolution to amend a resolution  falling within paragraph 4.3(a) or
          paragraph 4.3(b).

Documentation
5.1      I consent to:

(a)       the  inclusion of  references  to me and this  undertaking  in Amerada
          Hess's  announcement of the Offer (the "Press  Announcement")  as they
          appear in the attached draft of the Press Announcement;

(b)       particulars of this  undertaking  and my holdings of, and dealings in,
          relevant  securities  of Linda and Amerada Hess being  included in the
          Offer Document and any other related or ancillary document as required
          by the Code; and

(c)       this  undertaking  being available for inspection until the end of the
          offer period (as defined in the Code).

5.2 I shall  promptly  give you all  information  and any  assistance as you may
reasonably require for the preparation of the Offer Document and all related and
ancillary  documents in order to comply with the  requirements  of the Code, the
Financial  Services  Authority and the London Stock Exchange and any other legal
or regulatory  requirement or body. I shall immediately notify you in writing of
any  material  change in the  accuracy or impact of any  information  previously
given to you.

Secrecy
6. I will keep secret the possibility, terms and conditions of the Offer and the
existence and terms of this undertaking until the Press Announcement is released
provided  that I may disclose the same to Linda and its advisers in which case I
will use reasonable  endeavours to ensure that they observe  secrecy in the same
terms.  The  obligations  in this  paragraph  will survive  termination  of this
undertaking.

Interpretation
7. In this undertaking the "Offer" means the offer to be made by or on behalf of
Amerada Hess to acquire  ordinary  shares of 25p each in the capital of Linda on
substantially the terms of the Press  Announcement or on such other terms as may
be agreed  between  Amerada  Hess and Linda or as may be required to comply with
the  requirements  of the Panel on  Takeovers  and Mergers  (the  "Panel"),  the
Financial Services  Authority or the London Stock Exchange.  A reference in this
undertaking to the "Offer" also includes any new, increased,  renewed or revised
offer made by or on behalf of Amerada Hess to acquire shares in Linda,  provided
that the terms of such offer are,  in the  opinion  of  Goldman  Sachs,  no less
favourable to acceptors than the terms set out in the Press Announcement.

Time of the Essence
8. Any time,  date or period  mentioned in this  undertaking  may be extended by
mutual agreement but as regards any time, date or period  originally fixed or as
extended, time shall be of the essence.

The Offer
9.1 Subject to paragraph 9.2, Amerada Hess agrees to make the Offer if the Press
Announcement is published,  with Amerada Hess's prior approval, in substantially
the form attached (or in such other form as may be agreed  between  Amerada Hess
and LASMO or as may be required to comply with the  requirements of the Panel on
Takeovers and Mergers (the "Panel")) by not later than 8 November 2000. Approval
of  the  release  of  the  Press  Announcement  is at  Amerada  Hess's  absolute
discretion.

9.2 Amerada Hess will not be obliged to make or proceed with the Offer if, after
the Press Announcement is published:

(a)       the Panel consents to Amerada Hess not proceeding with the Offer; or

(b)       Amerada Hess is no longer  required by the City Code of Takeovers  and
          Mergers (the "Code") to proceed with the Offer.

9.3  Amerada  Hess  shall  have no  liability  to me for any  failure to make or
implement the Offer and I will not be entitled to specific performance of Clause
9.1 if, in each case,  Amerada Hess has become  aware that any  condition of the
Offer  as set out in the  Press  Announcement  has  become  incapable  of  being
fulfilled.

9.4  My obligations under this agreement will lapse if:

(a)       the Press Announcement is not released on 8 November 2000; or

(b)       the  Offer  is not  made in any of the  circumstances  referred  to in
          paragraph 9.2,

and in these  circumstances  neither party will have any claim against the other
except in respect of any prior breach.

If the undertaking lapses, I shall have no claim against Amerada Hess.

Director's undertakings
10.1 As a director  of Linda,  I shall use my best  endeavours  to procure  that
Linda and the board of directors of Linda:

(a)       provide all  assistance  which  Amerada  Hess  reasonably  requests to
          enable it to prepare the Offer  Document and all related and ancillary
          documents in accordance  with the  requirements  of the Code, the SEC,
          the Financial Services Authority and the London Stock Exchange and any
          other legal or regulatory requirement or body;

(b)       provide all  assistance  which  Amerada  Hess  reasonably  requests to
          Amerada Hess as may be required to obtain the  clearances and consents
          referred to in the Press Announcement;

(c)       if the Offer becomes  unconditional in all respects,  promptly approve
          the  appointment as  director(s) of Linda of the persons  nominated by
          Amerada  Hess and, if required by Amerada  Hess,  I shall  resign as a
          director of Linda ;

(d)       agree to any  extension of time limits in the Code for posting of this
          Offer which Amerada Hess requests and which the Panel approves; and

(e)       not make (and that no-one makes on behalf of Linda):

          (i)       any announcement  before the Press  Announcement is released
                    which refers expressly or implicitly to Amerada Hess; or

          (ii)      any other  announcement in connection with the Offer without
                    prior consultation with Amerada Hess,

         unless Amerada Hess consents in writing or the relevant announcement is
         required by law or any regulatory provision.

10.2     I shall:

(a)       not directly or indirectly  solicit any person other than Amerada Hess
          to propose or announce any offer for or any scheme of  arrangement  in
          respect of any shares or other securities of Linda; or

(b)       not directly or indirectly  initiate any discussions  with, or provide
          any information to, any person who is or may be considering  proposing
          or announcing such an offer or scheme; or

(c)       recommend  acceptance  of the  Offer  to  Linda  shareholders  and not
          modify,  qualify or withdraw that  recommendation  at any time, except
          insofar as to do so would be inconsistent with my duties as a Director
          of LASMO.

10.3 I shall promptly inform you of any approach by a third party which may lead
to an offer for Linda or the occurrence of any matter referred to above and will
keep you  fully  informed  of the same  (but  not of the  value of the  relevant
proposal or the identity of its proponent).

10.4 I confirm  that I know of no matter or  circumstance  which might mean that
any  condition  of the  Offer  set  out  in the  Press  Announcement  cannot  be
fulfilled.  I will  have  no  liability  to  Amerada  Hess  in  respect  of this
confirmation.

Confirmation
11. I confirm that in signing  this letter I am not a customer of Goldman  Sachs
for the purposes of the Rules of The Securities  and Futures  Authority and that
Goldman Sachs does not owe me any of the duties which it owes to its  customers.
I confirm that I have had an adequate  opportunity to consider whether or not to
give this undertaking and to obtain independent advice.

Power of Attorney
12.1  In  order  to  secure  the  performance  of  my  obligations   under  this
undertaking, I appoint any director of Amerada Hess as my attorney:

(a)       if I  fail  to  accept  or to  procure  acceptance  of  the  Offer  in
          accordance with  paragraphs  3(a), 3(b) or 3(c) or if I fail to accept
          the  offer  referred  to in  paragraph  3(d) in  accordance  with that
          paragraph, in my name and on my behalf to do all things and to execute
          all deeds and other  documents  as may be  necessary  or  desirable to
          accept  such  offers in respect of the Linda  Shares,  the  Beneficial
          Shares,  any  Further  Linda  Shares and the  options  referred  to in
          paragraph 3(d) (as appropriate); and

(b)       to execute any form of proxy  required by Amerada Hess  appointing any
          person  nominated  by  Amerada  Hess to attend  and vote on a Relevant
          Resolution  (as  defined  in  paragraph  4.3) at a general  meeting of
          Linda.

12.2 I agree  that this power of  attorney  is given by way of  security  and is
irrevocable  in accordance  with section 4 Powers of Attorney Act 1971 until the
Offer closes, lapses or is withdrawn.

Specific Performance
13. I agree  that,  if I fail to  accept  the  Offer  in  accordance  with  this
undertaking  or breach any of my  obligations,  damages would not be an adequate
remedy and accordingly  Amerada Hess shall be entitled to the remedy of specific
performance.

14.  General
14.1 The obligations I have accepted under this agreement are without  prejudice
to any  rights  of  Amerada  Hess or  Goldman  Sachs at  common  law or  equity.
Invalidity  of any  provision  of this  agreement  will  not  affect  any  other
provision.

14.2 Any  failure  or delay by any  person in  exercising  any  right,  power or
privilege  under  this  agreement  will not  comprise  a waiver  and a single or
partial exercise will not restrict any further exercise.

14.3 This  agreement is governed by and is to be construed  in  accordance  with
English law and each of the parties submits to the exclusive jurisdiction of the
English courts for all purposes in connection with this agreement.

<PAGE>

                                    SCHEDULE

                                 EXISTING SHARES

PART A - REGISTERED HOLDINGS OF LINDA ORDINARY SHARES

REGISTERED HOLDER                                         ORDINARY SHARES OF
                                                          25P EACH
(Print name of giver of
undertaking)

PAUL COLBECK MURRAY                                       9,869

                                                          55,399

PART B - BENEFICIAL HOLDINGS OF LINDA ORDINARY SHARES

BENEFICIAL OWNER                                          ORDINARY SHARES OF
                                                          25P EACH
(Print name)

-------------------------

PART C -  OPTIONS  AND OTHER  RIGHTS  TO  ACQUIRE  LINDA  SECURITIES  (INCLUDING
OPTIONS)

HOLDER                                           TYPE OF OPTION

(Print name)

-----------------------                          1984

                                                 -------------------------------
                                                 122,079

                                                 SAYE

                                                 -------------------------------
                                                 18,960

                                                 Equity Plan

                                                 -------------------------------
                                                 As per 20F SEC

<PAGE>

SIGNED and DELIVERED as a DEED by                    PAUL COLBECK MURRAY

Yours faithfully,

Signature         PAUL COLBECK MURRAY

Name              PAUL COLBECK MURRAY

in the presence of:

Signature of witness:      AO BRIEN

Name                       AO BRIEN

Address                    101 Bishopsgate
                           London  EC2M 3XH
                           Solicitor

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