Document:

<PAGE>   1
                                                                    EXHIBIT 10.2

                       FOURTH ADDENDUM TO LEASE AGREEMENT

       This Fourth Addendum to Lease Agreement (the "Fourth Addendum") is made
effective as of the 25 day of October, 2000, by and among JEMAL'S/CAYRE 6010
EXECUTIVE BLVD. L.L.C. ("Landlord") and INFORMAX, INC. ("Tenant");

       Whereas, Landlord and Tenant executed an Office Lease Agreement dated
March 31, 1999 (the "Lease") for Twelve Thousand Six Hundred Twenty Four
(12,624) square feet of space (the "Initial Premises") on the tenth floor of the
Building located at 6010 Executive Blvd., Rockville, Maryland (the "Building");

       Whereas, by Addendum to Lease dated July 8, 1999 (the "Addendum"), the
parties amended the Lease by adding an additional 5,600 square feet of space to
the Premises (the "New Space"), increasing the total square footage of the
Premises to 18,224;

       Whereas, by Second Addendum to Lease dated as of February 1, 2000 (the
"Second Addendum"), the parties amended the Lease by adding an additional 3,076
square feet of space to the Premises (the "Expansion Space"), increasing the
total square footage of the Premises to 21,300 square feet;

       Whereas, by Third Addendum to Lease dated as of May 19, 2000 (the "Third
Addendum"), the parties amended the Lease by adding an additional 3,076 square
feet of space to the Premises (the "Expansion Space"), increasing the total
square footage of the Premises to 24,376 square feet;

       Whereas, Tenant now wishes to lease additional space at the Building and
Landlord is willing to rent Tenant such additional space all in accordance with
the terms hereinafter set forth;

       Now, Therefore, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties agree as follows:

       1. MODIFICATION TO LEASE. The terms of this Fourth Addendum shall be
deemed to modify and supplement the terms of the Lease as amended by the
Addendum and Second Addendum and in the event of any inconsistencies the terms
of this Fourth Addendum shall control. All references herein and in the future
to the "Lease", unless the context is clearly otherwise, shall be deemed to be
the Lease as amended by the Addendum, the Second Addendum, the Third Addendum
and this Fourth Addendum. All capitalized terms used herein shall have the
meanings as set forth in the Lease, unless otherwise expressly defined herein.

       2. EXPANSION SPACE. Landlord hereby leases to the Tenant the additional
space as depicted on Exhibit A hereto as the "Fourth Expansion Space" being an
additional Three Thousand Eight Hundred Ninety (3890) square feet, including
core factor, located on the second (2nd) floor at the Building. The Net Rentable
Area of the Fourth Expansion Space has been

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determined in the manner set forth in Section 1.01. H. of the Lease. Hereafter,
the "Net Rentable Area of the Premises" for all purposes of the Lease shall be
28,266 square feet (being the sum of Net Rentable Area of (i) the Expansion
Space (ii) the New Space; (iii) the Initial Premises; (iv) the Third Expansion
Space and (v) the Fifth Expansion Space. The Tenant's Pro-Rata share under the
Lease after the date of this Fourth Addendum shall be 23.47%. All references to
Premises in the Lease, as amended by this Fourth Addendum, the Third Addendum,
the Second Addendum and the Addendum, "Premises", shall include the Initial
Premises, the New Space, the Expansion Space the Third Expansion Space, the
Fourth Expansion Space.

       3. ANNUAL BASE RENT. Commencing on the Fourth Commencement Date (as
defined below), the annual Base Rent for the second Lease Year for the Premises
(which includes the New Space, the Expansion Space, the Third Expansion Space,
the Fourth Expansion Space and the Initial Premises) shall be adjusted and shall
equal the sum of (i) the product of $24.98 multiplied by 21,300 square feet; and
(ii) the product of $28.50 multiplied by 6966 being the Net Rentable Area of the
Third Expansion Space and the Fourth Expansion Space. The Base Rent, as
determined above, shall be adjusted on the first day of each successive Lease
Year, starting with the Third Lease Year, in the manner set forth in the Lease.
The Fourth Commencement Date shall be November 1, 2000. Tenant may take
occupancy of the Fourth Commencement Date upon final execution of this Fourth
Addendum for the purpose of commencing "Tenant Improvements" to the Fourth
Expansion Space.

       4. ADDITIONAL SECURITY DEPOSIT. Upon execution of this Fourth Addendum,
the Tenant shall pay to Landlord the sum of $9238.75, such amount to be added to
and become part of the "Deposit" under Section 7.01 of the Lease, as increased
under Paragraph 4 of the Fourth Addendum.

       5. ADDITIONAL PARKING PERMITS. The number of parking permits set forth in
Section 3.01, as previously amended, is hereby increased from "60" to "71",
effective upon Tenant taking occupancy of the Fourth Expansion Space.

       6. IMPROVEMENTS TO FOURTH EXPANSION SPACE. The Fourth Expansion Space
shall be delivered in "AS IS" condition, and Tenant shall undertake all
improvements to the Fourth Expansion Space at its expense in accordance with the
provisions of ARTICLE IV of the Lease. Notwithstanding the foregoing, the
"Allowance payable by Landlord for the Fourth Expansion Space shall be $10.00
per rentable square foot of the Fourth Expansion Space, payable upon completion
of the improvements to the Fourth Expansion Space and otherwise in conformance
with the terms of Article IV of the Lease. Landlord have no obligations to make
any improvements to the Fourth Expansion Space.

       7. APPLICABILITY OF LEASE. Subsequent to the date of this Fourth
Addendum, all references in the Lease to the "Demised Premises" or "Premises"
shall include the Initial Premises as set forth in the Lease and the (i) New
Space; (ii) Expansion Space; (iii) Third Expansion Space; and (iv) Fourth
Expansion Space. It is the intent of the parties that except as

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otherwise expressly provided herein, the use and occupancy of the Fourth
Expansion Space shall be subject to all the terms and conditions of the Lease,
as if the Fourth Expansion Space was originally included as part of the
Premises. Except as otherwise expressly provided herein, all the terms of the
Lease, as previously amended by the Addendum, and the Second Addendum and Third
Addendum, shall remain in full force and effect and shall not be modified or
otherwise effected by this Fourth Addendum. The parties acknowledge that the
Lease, as amended, currently is in full force and effect, and that currently no
defaults exist thereunder.

       8. ENTIRE AGREEMENT. This Fourth Addendum constitutes the entire
understanding of the parties hereto relating to the subject matter hereof, and
shall be binding upon, and inure to the benefit of, the parties hereto, and
their permitted successors and assigns. This Fourth Addendum may not be amended
except by a writing signed by all the parties hereto.

       In Witness Whereof, the parties have signed this Fourth Addendum to Lease
Agreement effective this 29 day of September 2000.

JEMAL'S/CAYRE 6010 EXECUTIVE BLVD. L.L.C.

By: /s/ Douglas Jemal
   ---------------------------
   Douglas Jemal, Authorized Member

INFORMAX, INC.

   BY: /s/ JAMES E. BERNSTEIN
      ---------------------------

   JAMES E. BERNSTEIN
   ---------------------------
   CHIEF OPERATING OFFICER
   ---------------------------

                                       3<PAGE>   1
                                                                     EXHIBIT 4.4

                                      RULES
                                     OF THE
                              BCO TECHNOLOGIES PLC
                         UNAPPROVED SHARE OPTION SCHEME

                                Dated        2000

                                 MCGRIGOR DONALD

                                   SOLICITORS

                                  Pacific House
                              70 Wellington Street
                                     GLASGOW
                                     G2 6SB
                            Telephone: 0141 248 6677
                       Facsimile: 0141 204 1351 / 221 1390
                         E-Mail: enquiries@mcgrigors.com
                       Web Site: http://www.mcgrigors.com

<PAGE>   2

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
CLAUSE    HEADING                                                                                      PAGE NO.

<S>       <C>                                                                                          <C>
1         DEFINITIONS AND INTERPRETATION..................................................................1

2         GRANT OF OPTIONS................................................................................2

3         DEALINGS IN OPTIONS.............................................................................3

4         INVESTOR PROTECTION INDIVIDUAL LIMITS...........................................................3

5         INVESTOR PROTECTION COMPANY LIMITS ON OPTIONS...................................................4

6         EXERCISE OF OPTIONS.............................................................................5

7         LAPSE OF OPTIONS................................................................................6

8         CESSATION OF SERVICE............................................................................6

9         TAKEOVERS AND LIQUIDATIONS......................................................................7

10        VARIATION OF SHARE CAPITAL......................................................................8

11        MANNER OF EXERCISE OF OPTIONS...................................................................8

12        ALTERATION......................................................................................8

13        EMPLOYMENT......................................................................................9

14        TAXATION........................................................................................9

15        ADMINISTRATION..................................................................................9
</TABLE>

                                      (i)
<PAGE>   3

                        RULES OF THE BCO TECHNOLOGIES PLC
                         UNAPPROVED SHARE OPTION SCHEME

1    DEFINITIONS AND INTERPRETATION

1.1  In the Rules, including these definitions, the following words and
     expressions shall except insofar as the context otherwise requires have the
     meanings set opposite them respectively:

     "ACQUIRING COMPANY" means a company which has obtained control of the
     Company in terms of Rule 9.1 or 9.2 or, as the case may be, a company which
     has become bound or entitled as mentioned in Rule 9.3

     "ACQUISITION PRICE" means in respect of any Share over which an Option is
     granted the price at which such Share may be acquired on the exercise of
     the Option which price shall be determined by the Committee but shall not
     be less than the Market Value of a Share at the Date of Grant

     "ACT" means the Income and Corporation Taxes Act 1988

     "ASSOCIATED COMPANY" has the meaning given in paragraph 23 of Schedule 9 by
     virtue of Section 187 of the Act

     "AUDITORS" means the auditors of the Company (acting as experts and not as
     arbiters)

     "BOARD" means the board of directors of the Company

     "CLOSE PERIOD" means the period defined as a "close period" for the
     purposes of the Model Code of the Stock Exchange concerning dealings by
     directors and employees in securities of the Company

     "COMMENCEMENT DATE" means the date on which the Scheme is adopted by the
     Company

     "COMMITTEE" means the remuneration committee of the Board

     "COMPANY" means BCO Technologies PLC

     "CONTROL" has the meaning given in Section 840 of the Act

     "DATE OF GRANT" means in respect of any Option the date on which it is
     granted

     "DEALING DAY" means a day on which the London Stock Exchange is open for
     the transaction of business

     "ELIGIBLE EMPLOYEE" means a person who is either (a) an employee of a
     Participating Company who is not a Director of a Participating Company or
     (b) a Director of a

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      Participating Company who is required to devote to his duties
      substantially the whole of his working time and in no case less than 25
      hours per week (excluding meal breaks)

      "GRANT VALUE" means

      (a) in respect of any Share over which an Option has been granted or which
          has been acquired pursuant to the exercise of an Option the Market
          Value of that Share at the Date of Grant

      (b) in respect of any Share over which an option has been granted under
          any other share option scheme, the market value (as determined for the
          purposes of such scheme) of such Share at the time of grant of the
          option

      "LONDON STOCK EXCHANGE" means the London Stock Exchange Limited

      "MARKET VALUE" means the value of a Share determined for the purposes of
      the Scheme by the Committee

      "OPTION" means a right granted in accordance with the Rules to acquire
      Shares

      "OPTION HOLDER" means an individual to whom an Option has been granted or,
      if that individual has died, his executors or personal representatives

      "PARTICIPATING COMPANY" means the Company and any other company of which
      the Company has Control

      "RULES" means these rules as altered or varied from time to time

      "SCHEME" means the share option scheme constituted and governed by the
      Rules

      "SHARE" means an ordinary share in the capital of the Company

1.2   In these Rules, except insofar as the context otherwise requires:

1.2.1 words denoting the singular shall include the plural and vice versa;

1.2.2 words denoting the masculine gender shall include feminine gender; and

1.2.3 any reference to any enactment shall be construed as a reference to that
      enactment as from time to time amended, extended or re-enacted.

2     GRANT OF OPTIONS

2.1   At any time or times but not within a Close Period the Committee may grant
      or procure that there are granted to such individuals who shall at the
      proposed Date of Grant be Eligible Employees as the Committee may in its
      absolute discretion select options or rights to acquire on making payment
      of the Acquisition Price such numbers of Shares in the Company as the
      Committee shall determine.

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2.2   No Option shall be granted after the tenth anniversary of the Commencement
      Date. No Option shall be granted to an Eligible Employee within the period
      of two years immediately preceding the date on which he shall attain the
      age at which he is bound to retire in accordance with the terms of his
      contract of employment.

2.3   Any Option may be granted on terms that it may, or that except in stated
      circumstances it may, be exercised only subject to the satisfaction or
      waiver of such objective condition or conditions (including limitations on
      the time at or period during which the Option may be exercised) as the
      Committee may determine.

2.4   Any condition imposed under Rule 2.3 may be varied or amended only in
      accordance with the terms of the condition or in accordance with Rule 2.5.

2.5   If at any time after the Date of Grant there is in the opinion of the
      Committee a change in the circumstances of the Company or of the Option
      Holder which results in any condition imposed under Rule 2.3 being no
      longer appropriate, the condition may be varied or amended in such manner
      as the Committee shall in its discretion, which shall be exercised fairly
      and reasonably, think appropriate, provided that the condition as varied
      or amended is no more difficult to satisfy than the original condition was
      considered to be at the Date of Grant.

2.6   As soon as is reasonably practical after any Option has been granted the
      Committee shall ensure that there is issued to the Option Holder a
      certificate of Option in such form as the Committee may determine.

3     DEALINGS IN OPTIONS

3.1   No Option may be transferred, assigned or charged in any way. If any
      attempt is made to transfer, assign or charge any Option the Option shall
      lapse immediately. Each Option certificate shall carry a statement to this
      effect. Nothing in this Rule shall detract from the rights of the
      executors or personal representatives of a deceased Option Holder under
      the Rules to exercise his Option in his place.

3.2   Any Option Holder may at any time within the period of 30 days after the
      grant to him of an Option disclaim such Option in whole or in part by
      giving notice to the Company to that effect. To the extent that an Option
      is disclaimed, it shall be deemed never to have been granted. No
      consideration shall be payable for any such disclaimer.

3.3   Any Option Holder may surrender any Option at any time.

4     INVESTOR PROTECTION INDIVIDUAL LIMITS

4.1   No Option shall be granted pursuant to Rule 2 to an Eligible Employee if
      immediately following such grant the total aggregate Grant Value of:

4.1.1 all Shares over which he holds Options granted during the immediately
      preceding period of 10 years; and

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4.1.2 all Shares over which he holds options granted during such period under
      any other share option scheme (not being a savings-related share option
      scheme) during such period would exceed four times the total annual amount
      of the emoluments then payable to him by Participating Companies.

4.2   For the purposes of this Rule:

4.2.1 if an Eligible Employee surrenders any Option or option over Shares he
      shall be deemed to continue to hold such option unless the surrender
      occurred less than 30 days after the date of grant of the Option or option
      concerned; and

4.2.2 any Option or option which has lapsed shall be deemed not to have lapsed.

4.3   In determining at any time whether the limit specified in this Rule 4 has
      been complied with, no account shall be taken of and there shall be
      disregarded all Options granted before Shares are admitted to the Official
      List of the London Stock Exchange.

5     INVESTOR PROTECTION COMPANY LIMITS ON OPTIONS

5.1   No Option shall be granted under the Scheme if the grant would result in
      any of the limits specified in this Rule being contravened.

5.2   At any time the total of:

5.2.1 the aggregate nominal value of all Shares issued or which require to be
      issued upon the exercise of Options granted under the Scheme during the
      immediately preceding period of 10 years; and

5.2.2 the aggregate nominal value of all Shares issued or which require to be
      issued upon the exercise of options granted under any other share option
      scheme (not being a savings-related share option scheme) during that
      period shall not exceed 5 percent of the nominal value of the ordinary
      share capital of the Company then in issue unless all Options granted in
      excess of that limit are exercisable only in accordance with such special
      condition or conditions as the Committee shall impose under Rule 2.3

5.3   At any time the total of:

5.3.1 the aggregate nominal value of all Shares issued or which require to be
      issued upon the exercise of Options granted under the Scheme during the
      immediately preceding period of 10 years;

5.3.2 the aggregate nominal value of all Shares issued or which require to be
      issued upon the exercise of options granted under any other share option
      scheme during that period; and

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5.3.3 the aggregate nominal value of all Shares issued pursuant to any other
      employee share scheme during that period shall not exceed 10 percent of
      the nominal value of the ordinary share capital of the Company then in
      issue.

5.4   In determining at any time whether any of the limits specified in this
      Rule 5 have been complied with no account shall be taken of and there
      shall be disregarded in calculating the nominal value of the Shares issued
      or which require to be issued upon the exercise any Options or options:

5.4.1 all Shares which would have been required to be issued pursuant to any
      Option or option which has lapsed or been surrendered or disclaimed, and

5.4.2 all Options granted before Shares are first listed on the Alternative
      Investment Market.

5.5   Any references in this Rule 5 to any or any other share option scheme or
      to any savings-related share option scheme or to any employee share scheme
      shall be construed respectively as references to such schemes as have been
      or may be established by the Company or by any Associated Company to which
      Shares are subject.

6     EXERCISE OF OPTIONS

6.1   Any Option which has not lapsed or been surrendered may be exercised in
      whole or in part at any time and from time to time following the earliest
      to occur of the following events:

6.1.1 the third anniversary of the Date of Grant;

6.1.2 the death of the Option Holder;

6.1.3 the Option becoming exercisable in accordance with Rule 8; and

6.1.4 the Option becoming exercisable in accordance with Rule 9.

6.2   If at any time before the third anniversary of the Date of Grant of any
      Option there shall occur in relation to the Option Holder or the Company
      any event which the Committee shall consider makes it appropriate for such
      Option to become exercisable then the Committee may determine that such
      Option shall be exercisable for such period ending not later than the day
      before the day on which the Option would otherwise become exercisable and
      not exceeding six months as the Committee shall determine. The Committee
      may, if it thinks it appropriate, in relation to any exercise of Option
      taking place within such period waive any condition of exercise which
      would otherwise be applicable. For the avoidance of doubt such Option
      shall not lapse at the end of such period, unless the Committee shall so
      determine.

6.3   If under Rule 2.3 an Option is exercisable subject to the satisfaction or
      waiver of any condition or conditions then, except as otherwise provided
      in the Rules or as stated in the

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      Certificate of Option issued at the time of grant, it shall be exercisable
      only if those condition or conditions (as varied or amended in accordance
      with Rule 2.3) have been satisfied or waived at the time of exercise.

7     LAPSE OF OPTIONS

7.1   An Option shall lapse on the date on which there shall occur the earliest
      to occur of the following events:

7.1.1 the tenth anniversary of the Date of Grant;

7.1.2 the first anniversary of the death of the Option Holder;

7.1.3 where Rule 6.2 applies and the Committee has determined that the Option
      concerned should lapse at the end of the period during which it is
      exercisable by virtue of that Rule, the end of that period;

7.1.4 where Rule 8 applies, the date of lapse determined in accordance with Rule
      8;

7.1.5 where Rule 9 applies, unless a release has been effected under Rule 9.4,
      the end of the relevant period specified in Rule 9 during which an Option
      may be exercised, but only if not later than one month before the end of
      that period the Committee shall give notice to Option Holders that Options
      shall so lapse; and

7.1.6 the Option Holder being adjudicated bankrupt or declared apparently
      insolvent.

7.2   An Option which is exercisable subject to satisfaction of a condition
      imposed under Rule 2.3 shall lapse if, or to the extent that, it is
      determined that the condition has not been satisfied.

8     CESSATION OF SERVICE

8.1   This Rule applies if an Option Holder ceases, other than by death, to be a
      director or employee of a Participating Company and does not remain a
      director or employee of another Participating Company.

8.2   All Options held by the Option Holder shall lapse when the cessation
      occurs unless Rule 8.3 applies.

8.3   If:

8.3.1 the cessation occurs by reason of injury, disability or retirement on
      reaching normal retirement age, or

8.3.2 the cessation occurs for some other reason but within two months after the
      cessation the Committee decides that Rule 8.2 should not apply then,
      subject to Rule 8.4:

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8.3.3 any Option held by the Option Holder which immediately before the
      cessation is exercisable shall remain exercisable until six months after
      the date of cessation when it shall lapse; and

8.3.4 any Option held by the Option Holder which immediately before the
      cessation has not become exercisable shall become exercisable if and when
      and to the extent that it would have become exercisable if the cessation
      had not occurred and shall lapse six months after it first becomes
      exercisable.

8.4   If Rule 8.3 applies the Committee may in its absolute discretion:

8.4.1 decide that any Option held by the Option Holder shall be exercisable at
      such time or times or during such period and shall lapse at such time as
      the Committee shall specify, and/or

8.4.2 waive any condition of exercise imposed under Rule 2.3.

9     TAKEOVERS AND LIQUIDATIONS

9.1   If any person obtains Control of the Company as a result of making

9.1.1 a general offer to acquire the whole of the issued ordinary share capital
      of the Company (other than that which is already owned by such person)
      which is made on a condition such that if it is satisfied the person
      making the offer will have Control of the Company or

9.1.2 a general offer to acquire all the shares in the Company which are of the
      same class as the Shares and which are not already owned by that person
      then any Option may be exercised before the expiry of the period of six
      months beginning at the time when the person making the offer has obtained
      Control of the Company and any condition subject to which the offer is
      made has been satisfied. If a person obtains Control of the Company as
      contemplated by this Rule the Committee shall as soon as practicable
      notify all Option Holders of that fact.

9.2   If under Article 418 of the Companies (Northern Ireland) Order 1986 or
      Article 96 of the Insolvency (Northern Ireland) Order 1989 the Court
      sanctions a compromise or arrangement proposed for the purposes of or in
      connection with a scheme for the reconstruction of the Company or its
      amalgamation with any other company or Companies, any Option may be
      exercised before the expiry of the period of six months beginning on the
      date on which the Court sanctions the compromise or arrangement. If the
      Court sanctions a compromise or arrangement as contemplated by this Rule
      the Committee shall as soon as practicable notify all Option Holders of
      that fact.

9.3   If any person becomes bound or entitled to acquire shares in the Company
      under Part XIVA of the Companies (Northern Ireland) Order 1986 any Option
      may be exercised at any time when that person remains so bound or
      entitled. If any person becomes bound or

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     entitled as contemplated by this Rule the Committee shall as soon as
     practicable notify all Option Holders of that fact.

9.4  If the Company passes a resolution for voluntary winding up, any Option may
     be exercised within six months after the passing of the resolution.

9.5  For the purposes of this Rule 9 a person shall be deemed to have obtained
     Control of a Company if he and others acting in concert with him have
     together obtained Control of it.

10   VARIATION OF SHARE CAPITAL

10.1 In the event of any capitalisation issue, rights issue, consolidation,
     sub-division or reduction or other variation of share capital by the
     Company the number of Shares over which Options subsist and the Acquisition
     Price for each of those Shares may, if the Committee considers it
     appropriate, be adjusted in such manner as the Auditors confirm in writing
     to be fair and reasonable.

10.2 The Company shall promptly after any adjustment has been made pursuant to
     this Rule give notice thereof to all Option Holders.

11   MANNER OF EXERCISE OF OPTIONS

11.1 An Option shall be exercised by the Option Holder giving notice to the
     Company in writing signed by him and setting out the number of Shares in
     respect of which he wishes to exercise the Option and such notice shall be
     accompanied by payment in full of the Acquisition Price payable for such
     Shares and the relevant option certificate, and shall be effective on the
     date of its receipt by the Company.

11.2 Not later than thirty days after the date of exercise of any Option the
     Shares which then fall to be acquired by the Option Holder shall be issued
     or transferred to him and a definitive share certificate or other
     appropriate evidence of title shall be issued to him in respect of such
     Shares. Shares issued as a result of the exercise of any Option shall rank
     pari passu with the other shares of the same class in issue at the date of
     issue, but shall not confer any right, dividends or other benefits or
     entitlements the right to which is determined by reference to a date
     preceding the date of issue.

11.3 When an Option is exercised only in part, the balance shall remain
     exercisable on the same terms as originally applied to the whole Option and
     a new option certificate shall be issued accordingly by the Company as soon
     as possible after the partial exercise.

11.4 All allotments and issues and transfers of Shares to be made pursuant to
     the Scheme shall be subject to the obtaining of all necessary statutory or
     other consents.

12   ALTERATION

     The Committee may from time to time alter or add to all or any of the Rules
     in such manner and to such extent as the Committee shall think fit,
     provided that no alteration or

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     addition shall materially and adversely affect the rights of an Option
     Holder as regards an Option granted prior to the alteration or addition
     being made.

13   EMPLOYMENT

     The terms and conditions of the employment by any Participating Company of
     any Option Holder shall not be changed or affected in any way by his being
     the holder of any option under the Scheme, or by such rights as he may have
     to participate in the Scheme. In the event of the termination of the
     employment by a Participating Company of any Option Holder he shall not be
     entitled to any compensation or damages in respect of any loss or
     diminution in the value of his rights under the Scheme which may occur as a
     result of such termination.

14   TAXATION

14.1 Each Option Holder shall pay to and indemnify and keep indemnified all
     Participating Companies from and against the full amount of any and all
     liability to pay as you earn income tax, employee national insurance
     contributions and other liabilities which are attributable to the grant or
     exercise or any benefit derived by the Option Holder from any Option and
     which are primarily liabilities of or which arise in respect of the Option
     Holder but which a Participating Company is or may become liable to
     discharge.

14.2 Without prejudice to Rule 13.1, no Option Holder shall be entitled to
     exercise any Option unless and until he has entered into arrangements which
     are in all respects satisfactory to the Company to enable the Company to
     recover from the Option Holder any and all amounts of pay as you earn
     income tax, employee national insurance contributions and any other
     taxation or other liabilities which any Participating Company is or may
     become liable to discharge as a result of the exercise of the Option or in
     respect of any benefit derived by the Option Holder from the Option.

15   ADMINISTRATION

15.1 The Scheme shall be administered by the Committee whose decision on all
     disputes and matters concerning the interpretation of the Rules shall be
     final.

15.2 The cost of establishing and operating the Scheme shall be borne by the
     Participating Companies in such proportions as the Committee shall
     determine.

15.3 No person shall for the purposes of the Scheme be treated as ceasing to be
     a director or employee of a Participating Company until he is no longer a
     director or employee of the Company or of any Associated Company or other
     company of which the Company has Control.

15.4 Any notice or other communication under or in connection with the Scheme
     may be given by the Company either personally or by post and to the Company
     either personally or by post to the secretary; items sent by post shall be
     pre-paid and shall be deemed to have been received 72 hours after posting.

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15.5 The Company shall at all times either keep available sufficient authorised
     and unissued Shares to satisfy all Options which have neither lapsed or
     been fully exercised, or shall procure that sufficient Shares are available
     for transfer to satisfy all such Options.

15.6 The Scheme, the Rules and all other documents relating to the Scheme shall
     be govemed by and construed in accordance with Northern Irish Law.

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