Document:

EXHIBIT 10
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         withdrawn, I shall not: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)
-------------------------

PART B - Beneficial Holdings of Linda Ordinary Shares

Beneficial Owner                                            Ordinary Shares of
                                                            25p each

(Print name)
ANTONY PEVERELL HICHENS                                     43,122

PART C -  Options  and other  rights  to  acquire  Linda  securities  (including
options)

Holder                                                      Type of option
(Print name)
-----------------------

<PAGE>

SIGNED and DELIVERED as a DEED by......................................

Yours faithfully,

Signature:                 ANTONY PEVERELL HICHENS

Name:                      ANTONY PEVERELL HICHENS

in the presence of:

Signature of witness:      AO BRIEN

Name                       AO BRIEN

Address           101 Bishopsgate
                  London  EC2M 3YH
                  SolicitorEXHIBIT 11
The Directors
LASMO plc ("LASMO" or the "Company")
101 Bishopsgate
London EC2M 3XH

6 November 2000

STRICTLY PRIVATE & CONFIDENTIAL

Dear Sirs

We refer to our  discussions  concerning  the proposed offer (the "Offer") by us
for the ordinary shares in the capital of LASMO (the "Shares").

1.1 Subject to paragraph 1.2, Amerada Hess agrees to make the Offer if the Press
Announcement  is published by not later than 8 November 2000 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")).  Approval
of  the  release  of  the  Press  Announcement  is at  Amerada  Hess's  absolute
discretion.

1.2 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 on  Takeovers  and
         Mergers (the "Code") to proceed with the Offer.

1.3  Amerada  Hess shall have no  liability  to LASMO for any failure to make or
implement  the Offer and LASMO will not be entitled to specific  performance  of
Clause 1.1, 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.

1.4      The obligations of LASMO 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 1.2,

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

1.5 LASMO  confirms to Amerada Hess that it will agree to any  extension of time
limits for posting the Offer in the Code which  Amerada  Hess  approves  and the
Panel approves, or would approve if LASMO so agreed.

Exclusivity

2.1 LASMO agrees that it will not, and will procure that none of its  subsidiary
undertakings (or any of its or their respective directors,  employees, advisers,
agents or representatives acting in that capacity) will, directly or indirectly:

(a)      solicit  or  initiate  the  submission  of  proposals,  indications  of
         interest  or  offers  of any kind from any  person  (other  than us) in
         relation  to any offer,  scheme,  merger or  business  combination,  or
         similar  transaction or  arrangement  which results in the ownership of
         all or a significant proportion of the Shares passing to any person (an
         "Alternative Proposal"); or

(b)      initiate any discussions or negotiations with any person in relation to
         any Alternative Proposal.

2.2 This Clause 2 will not prevent LASMO responding to any Alternative  Proposal
from any third party if LASMO has complied at all times with Clause 2.1 and each
of its  Directors  and its Rule 3 advisers  have complied with the terms of that
Clause as if they were bound by it directly. If information about the affairs of
LASMO  or any of its  subsidiary  undertakings  is given  to  another  potential
offeror, LASMO will provide the same information to us promptly.

3.  LASMO  will  promptly  (but not  more  than 24 hours  after  receipt  of any
Alternative  Proposal),  notify Amerada Hess of (a) any Alternative  Proposal of
which it or any of its officers  becomes aware (b) any indication of which it or
any of its  officers  becomes  aware  that any person is  considering  making an
Alternative Proposal,  and LASMO will at all times keep Amerada Hess informed of
the status of any such  Alternative  Proposal.  This  Clause 3 will not  require
disclosure  of the terms of any  Alternative  Proposal  or the  identity  of its
proponent.

4.  LASMO  confirms  that  neither  it nor any of its  officers  nor its  Rule 3
advisers have previously  engaged in discussions  which have not been terminated
with respect to an Alternative Proposal.

5.1 LASMO's  obligations under Clauses 1 to 4 will terminate if the Announcement
in relation to the Offer is not made prior to midnight on 8 November 2000.

5.2 LASMO's  obligations  under Clauses 1 to 4 following the  Announcement  will
terminate if, once made, the Offer lapses or is withdrawn.

Inducement Fee

6.1 Amerada Hess shall be entitled to payment of a sum  calculated in accordance
with Clause 5.2 if:

(a)      a Trigger  Event occurs and, at any time prior to the end of the fourth
         month following the end of the Relevant Period, any person announces an
         intention (whether or not subject to any pre-condition) to implement an
         Alternative   Proposal  and  that  person  consummates  an  Alternative
         Proposal (whether or not in the form announced) at any time during 2001
         (for this purpose  "Alternative  Proposal"  includes an  acquisition or
         disposal  of  a  material  asset  being  one  with  a  value  exceeding
         (pound)100 million); or

(b)      during  the  Relevant  Period,  the  directors  of  LASMO  (i)  fail to
         recommend  unanimously LASMO  Shareholders to accept the Offer; or (ii)
         withdraw   any  such   recommendation,   or  (iii)   qualify  any  such
         recommendation in a manner not previously  approved by Amerada Hess (in
         each case  irrespective  of whether they could continue to recommend in
         good faith or in accordance with their duties); or

(c)      during the Relevant Period,  LASMO or any of its directors  voluntarily
         authorises or directs any action or omission  which will give rise to a
         breach of this  agreement  by LASMO or prevent a condition to the Offer
         being  satisfied  in  either  case in a way  which is  material  in the
         context of the Wider LASMO Group (as defined in the press  announcement
         to be issued in connection with the Offer) or which otherwise  requires
         LASMO shareholders' approval under the Takeover Code.

For these purposes, a "Trigger Event" will occur if during the Relevant Period:

(a)      any person makes public an interest in making, or an intention to make,
         an Alternative Proposal; or

(b)      any person  together  with any person acting in concert with it (within
         the meaning of the City Code)  acquires  or agrees to acquire,  whether
         subject to  conditions,  pre-conditions  or  otherwise,  shares  and/or
         rights  over  shares (as defined in the City Code) as a result of which
         such  persons  hold shares or rights over shares  carrying in aggregate
         more than 10% of the voting rights  exercisable at general  meetings of
         LASMO;

For these purposes and for the purposes of Clause 7 below, the "Relevant Period"
is the period from the date of this  Agreement  until the Offer  lapses or it is
announced  that  the  Offer  will  not be made  or is  withdrawn  (whichever  is
earlier).

6.2      The amount payable by LASMO under Clause 6.1 shall be:

(a)      one per cent. of the amount that results from multiplying 180 pence per
         Company  ordinary share by the number of issued  ordinary shares in the
         capital of LASMO as at the date of this Agreement; or

(b)      if it is less than the  amount  specified  in  sub-paragraph  (a),  the
         maximum  amount  which,  if deducted from the net assets of LASMO as at
         the date of this Agreement,  would not reduce them to a material extent
         (all such expressions  being interpreted in accordance with Section 152
         of the Companies Act 1985); or

(c)      if it is less than the  amount  specified  in  sub-paragraph  (b),  the
         largest  amount in respect of which the  commitment  of LASMO in Clause
         6.1 can lawfully be given.

Such  amount,  once  it has  become  payable,  will be  paid  by  LASMO  without
deduction, set-off or counterclaim within five business days following a written
notice of demand for payment by Amerada Hess.

LASMO Holdings

7.1      LASMO confirms to Amerada Hess that:

(a)      Methodplan  Ltd,  registered  in England with company  number  2642814,
         ("Methodplan") is a wholly owned subsidiary of LASMO;

(b)      at the date hereof  Methodplan is the beneficial owner of not less than
         8,458,007  ordinary  shares in the  capital of LASMO  (the  "Methodplan
         Shares"),  which are fully paid and held free from all liens, equities,
         charges, encumbrances and other interests;

(c)      no other  subsidiary of LASMO is the legal or  beneficial  owner of any
         ordinary shares of LASMO; and

(d)      in  connection  with the LASMO  Share  Option  Scheme  dated  1984 (the
         "Executive  Scheme"),  the  Monument  Share  Option  Scheme,  the LASMO
         International  Plan and the Monument  Oil and Gas Share  Option  Scheme
         dated 1987, the Methodplan  Shares may, lawfully and in accordance with
         the terms of the Executive  Scheme,  be used to satisfy the exercise of
         share options granted to employees of LASMO and its subsidiaries.

7.2 Except as provided in Clause 7.4 or as previously  approved by Amerada Hess,
LASMO will procure that during the Relevant  Period,  Methodplan  will not sell,
transfer,  charge,  encumber,  grant any right over or otherwise  dispose of any
Methodplan  Shares  (including  pursuant to the Offer) and shall not acquire any
further Shares.

7.3 LASMO will procure that  Methodplan will accept the Offer in respect of such
number of shares (not exceeding its holding) as Amerada Hess may direct no later
than  five  London  Stock  Exchange  dealing  days  after  the date of the Offer
Document  and,  if a mix and match  election  is  available,  will elect for the
maximum  amount of additional  cash  available (or such lesser amount of cash as
Amerada Hess may direct).

7.4(a)   Insofar as options are exercised after the date of this agreement:

             (i)  under the Executive  Scheme and in respect of approved options
                  under the  Monument  1996  Share  Option  Scheme,  LASMO  will
                  procure  that such  exercises  are  satisfied,  as directed by
                  Amerada  Hess,  by the  transfer  of the  shares  held  by the
                  trustee of the LASMO  Employee Share Trust,  if lawful,  or by
                  the  lawful   transfer   of  shares   beneficially   owned  by
                  Methodplan.

            (ii)  under  the  LASMO  International  Share  Option  Plan  or  the
                  Monument  Oil and Gas Share  Option  Scheme  dated 1987 or the
                  Monument  1996 Share  Option  Scheme (in the latter case as to
                  the exercise of  unapproved  share options  only),  LASMO will
                  ensure  that  such  exercises  are  satisfied  in  cash by the
                  payment of the amount required under the relevant  schemes or,
                  to the extent directed by Amerada Hess, by the lawful transfer
                  of shares beneficially owned by Methodplan.

(b)      Insofar as entitlements  arise under the LASMO Equity Plan,  LASMO will
         ensure  that they are  satisfied  in cash by the  payment of the amount
         required under the relevant schemes.

(c)      The Company  confirms  to Amerada  Hess that it will not  exercise  its
         discretion to satisfy  entitlements  under the LASMO Share Appreciation
         Rights Plan by issuing or procuring the transfer of any Shares.

Other Share Issues and Dividends

8.1 LASMO confirms to Amerada Hess that the  information in Appendix A regarding
the share  capital of LASMO and the rights of the  holders of options  and other
entitlements  to require the  allotment or transfer of any shares in the capital
of LASMO  (or any  interest  therein)  is  accurate  and not  misleading  in all
material respects and that there are no other entitlement not so shown.

8.2 LASMO agrees that,  unless the Offer has lapsed or been  withdrawn,  it will
not and it will procure that none of its subsidiaries  will (except as agreed by
Amerada Hess prior to the date of this Agreement):

(a)      make any further awards or grant any further options or entitlements to
         Shares under any of the Executive Scheme, the LASMO International Share
         Option Plan,  the Monument 1996 Share Option  Scheme,  the Monument Oil
         and Gas Share  Option  Scheme  dated  1987,  the LASMO SAYE Plan or the
         LASMO Equity Plan  (together the "Schemes") or any other scheme or plan
         or  otherwise  or grant any other  rights to any person to require  the
         allotment or transfer of any Shares (or any interest therein); or

(b)      grant any  additional  remuneration  or benefits  (or any  entitlements
         thereto) to any of its senior executives.

8.3 Without  limiting  Clause 8.2,  LASMO agrees that it will not allot or issue
any further  share  capital  except as  required by the Schemes  until the Offer
shall have lapsed.

8.4 LASMO agrees that,  unless the Offer has lapsed or been  withdrawn,  it will
not  recommend,  declare,  pay or make or propose  any bonus,  dividend or other
distribution.

Further Assurance
9.1 Save to the extent that to do so would  constitute a breach of the duties of
its  directors  imposed on them by virtue of holding that  office,  LASMO agrees
that it shall take or cause to be taken all such reasonable  steps as are within
its power and necessary to assist  Amerada Hess in the  preparation of necessary
regulatory notices,  applications and filings,  obtaining necessary consents and
authorisations and providing the necessary information to enable Amerada Hess to
prepare a Form S-4 registration  statement and offer document in accordance with
the Takeover Code and other documentation required in connection with the Offer.

9.2 LASMO will cooperate with Amerada Hess in ascertaining  the  entitlements of
employees under each of the Schemes,  including,  without limitation,  providing
promptly on request (i) all information  reasonably requested by Amerada Hess on
the number of Shares the subject of entitlements under each of the Schemes, (ii)
any  documentation  relevant to the entitlements of employees under the Schemes,
and (iii) details of exercises of shares options as they occur.

The terms of this letter shall be governed by and interpreted in accordance with
English  law and the courts of England  are to have  exclusive  jurisdiction  in
respect of any disputes relating to it.

If you agree to the above terms,  please  indicate your agreement by signing and
returning a copy of this letter.

Yours faithfully

J.B. HESS

for and on behalf of Amerada Hess

We confirm  that we agree and  accept the terms of this  letter and intend to be
legally bound by its terms

PAUL MURRAY
for and on behalf of LASMO plc

Dated  ____ November 2000

<PAGE>
<TABLE>

                                   Appendix A
<CAPTION>
                      Part 1. LASMO Executive Option Scheme

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

                                    Number          Number which can be     Number which can be          Number which must be
                                                     satisfied in cash         satisfied by              satisfied by new
                                                       compulsorily          existing shares             issue of shares

-----------------------------------------------------------------------------------------------------------------------------------
<S>                            <C>                      <C>              <C>                                 <C>

Maximum   number   of   options    4,100,465                Nil              4,100,465                           Nil
exercisable   or   capable   of
exercise   on   a   change   of
control  from the  date  hereof
until 30/6/2001

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

Maximum  number of options         3,421,808                Nil              3,421,808                           Nil
exercisable or capable of
exercise on a change of
control  where the offer
value is between  140p and
220p from the date hereof
until 30/6/2001

-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>
                        Part 2. LASMO International Plan

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

                                        Number        Number which can    Number which can be         Number which must be
                                                       be satisfied          satisfied by             satisfied by new
                                                    in cash compulsorily    existing shares           issue of shares
--------------------------------------------------------------------------------------------  --------------------------------------

<S>                                 <C>              <C>                    <C>                               <C>
Maximum    number    of    options    6,866,732         6,866,732             6,866,732                           Nil
exercisable    or    capable    of
exercise  on a change  of  control
from   the   date   hereof   until
30/6/2001

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

Maximum    number    of    options    6,013,032         6,013,032             6,013,032                           Nil
exercisable    or    capable    of
exercise  on a change  of  control
where the offer  value is  between
140p  and   220p   from  the  date
hereof until 30/6/2001
------------------------------------------------------------------------------------------------------------------------------------

</TABLE>
<TABLE>
<CAPTION>
                    Part 3. Monument 1987 Share Option Scheme

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

                                        Number     Number which can     Number which can       Number which can be
                                                   be satisfied in      be satisfied by       satisfied by new issue
                                                   cash compulsorily    existing shares            of shares
------------------------------------------------------------------------------------------------------------------------------------
<S>                                 <C>           <C>                    <C>                     <C>
Maximum    number    of    options     106,010        106,010                Nil                    106,010
exercisable    or    capable    of
exercise  on a change  of  control
from   the   date   hereof   until
30/6/2001

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

Maximum    number    of    options     106,010        106,010                Nil                    106,010
exercisable    or    capable    of
exercise  on a change  of  control
where the offer  value is  between
140p  and   220p   from  the  date
hereof until 30/6/2001
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>
                        Part 4. Monument 1996 Option Plan

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

                                       Number           Number which can     Number which can      Number which must
                                                        be satisfied in      be satisfied          be satisfied by new
                                                        cash compulsorily    by existing shares     issue of shares
------------------------------------------------------------------------------------------------------------------------------------
<S>                                 <C>                 <C>                 <C>                               <C>
Maximum    number    of    options     3,217,471            2,830,609         3,217,471                           Nil
exercisable    or    capable    of
exercise  on a change  of  control
from   the   date   hereof   until
30/6/2001

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

Maximum    number    of    options     3,217,471            2,830,609         3,217,471                           Nil
exercisable    or    capable    of
exercise  on a change  of  control
where the offer  value is  between
140p  and   220p   from  the  date
hereof until 30/6/2001
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>
                             Part 5. LASMO SAYE Plan

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

                                       Number                Number which can     Number which can    Number which must be
                                                             be satisfied in      be satisfied by     satisfied by new
                                                             cash compulsorily    existing shares      issue of shares
--------------------------------------------------------------------- --------------------------------------------------------------
<S>                                 <C>                        <C>             <C>                     <C>
Maximum    number    of    options    3,219,971                   Nil              Nil                    3,219,971
exercisable    or    capable    of
exercise  on a change  of  control
under the LASMO SAYE Plan  between
the date hereof and 30/6/2001

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

Maximum    number    of    options    3,121,406                  Nil               Nil                    3,121,406
exercisable    or    capable    of
exercise  on a change  of  control
under  the LASMO  SAYE Plan  where
the offer  value is  between  140p
and  220p  from  the  date  hereof
until 30/6/2001
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
<TABLE>
<CAPTION>
                      Part 6. LASMO Share Appreciation Plan

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

                                         Number     Number which           Number which can be       Number which must
                                                    can be satisfied       satisfied by existing     be satisfied by new
                                                    in cash compulsorily          shares             issue of shares
------------------------------------------------------------------------------------------------------------------------------------

<S>                                   <C>            <C>                    <C>                         <C>
Maximum    number    of    options        Nil            Nil                    Nil                        Nil
exercisable    or    capable    of
exercise  on a change  of  control
under     the     LASMO      Share
Appreciation   Plan   between  the
date hereof and 30/6/2001
------------------------------------------------------------------------------------------------------------------------------------
Maximum    number    of    options        Nil            Nil                    Nil                        Nil
exercisable    or    capable    of
exercise  on a change  of  control
under     the     LASMO      Share
Appreciation  Plan where the offer
value  is  between  140p  and 220p
from   the   date   hereof   until
30/6/2001

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

</TABLE>

                            Part 7. LASMO Equity Plan

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

Base number of shares currently subject to awards under
the plan

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

Proportion which can be satisfied in cash                     100%
--------------------------------------------------------------------------------

                                  Part 8. Other

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

Existing issued  share  capital  of                   1,344,328,323 ordinary
LASMO (by class)                                      shares  of 25p    each
                                                      (including  the shares
                                                      beneficially held by
                                                      Methodplan and 1,616,633
                                                      held by the trustee of the
                                                      LASMO Employee Share
                                                      Trust)

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

Authorised share capital of LASMO                     1,703,812,700 ordinary
                                                      shares of 25p each

--------------------------------------------------------------------------------
Number of shares held by any  subsidiary             Not less than  8,458,007
undertakings of LASMO                                (and not more than
                                                     8,658,007 beneficially held
                                                     by Methodplan

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

Number of shares  issuable  upon the                Only those shares which fail
exercise of subscription  rights or                 to be issued upon conver-
conversion rights (save as disclosed in             sion of the 7 3/4% conver-
Parts 1-7 above)                                    tible bonds due 2005.  The
                                                    current conversion price is
                                                    541p per share.
--------------------------------------------------------------------------------

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