TERRA INDUSTRIES INC
8-K/A, 1998-01-14
MISCELLANEOUS NONDURABLE GOODS
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<PAGE>
 
================================================================================
                                        
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                  FORM 8-K/A
                                Amendment No. 1

                                CURRENT REPORT

                      Pursuant to Section 13 or 15(d) of
                      the Securities Exchange Act of 1934


      Date of Report (Date of earliest event reported): December 31, 1997



                             TERRA INDUSTRIES INC.
            (Exact name of registrant as specified in its charter)



           Maryland                        1-8520                52-1145429
(State or other jurisdiction of       (Commission File        (I.R.S. Employer
incorporation or organization)            Number)            Identification No.)


              Terra Centre
           600 Fourth Street
             P.O. Box 6000
            Sioux City, Iowa                                       51102-6000
(Address of principal executive offices)                           (Zip Code)


      Registrant's telephone number, including area code:  (712) 277-1340

================================================================================
<PAGE>
 
     Reference is made to the Current Report on Form 8-K dated November 20, 1997
filed by Terra Industries Inc. There is hereby added to such Form 8-K an Item 2
and an Item 7 as follows:

ITEM 2.   Acquisition or Disposition of Assets.

     Terra Industries Inc. ("Terra"), through its indirect, wholly owned
subsidiary Terra Nitrogen (U.K.) Limited ("Terra Nitrogen UK"), acquired on
December 31, 1997 the United Kingdom nitrogen fertilizer business (the
"Business") of Imperial Chemical Industries plc ("ICI"). The Business, which had
1996 revenues of about $350 million, employs nearly 600 people at two
manufacturing facilities located in Billingham (northeastern England) and
Severnside (southwestern England) and at an office in Wilton. Combined annual
production capacity for the facilities is approximately 740,000 metric tons of
ammonia. Most of the ammonia is upgraded into nitric acid and ammonium nitrate,
which upgrade facilities have annual production capacity of 1.2 million metric
tons and 1.1 million metric tons, respectively. Additionally, 600,000 metric
tons of annual carbon dioxide capacity is included in the Business. The output
from these facilities is expected to continue to be marketed by Terra Nitrogen
UK to agricultural and industrial users in the UK and to be exported to western
Europe.

     The purchase price for the Business was (Pounds)200 million (or
approximately $340 million). ICI retains liabilities relating to the Business.
In a separate transaction, ICI is paying Terra (Pounds)8 million for an ammonium
nitrate hedge agreement covering, under certain conditions, 500,000 metric tons
per year for five years. Terra's payments, if any, under the hedge agreement
cannot exceed (Pounds)58 million over the five-year period. As a result of
making any such payments, Terra will not benefit fully from the U.K. price of
ammonium nitrate over certain threshholds during the term of this hedge
agreement. In addition, various implementation agreements have been entered into
by the parties to provide services and materials to one another in connection
with the Business and ICI's other businesses located nearby.

     Terra funded the acquisition with $125 million from a five year term loan
provided by a bank group led by Citibank and secured by the assets of the Terra
International (Canada) Inc. subsidiary, $175 million as part of the sale by
Terra of a $225 million minority preferred limited partnership interest in its
Beaumont Methanol, Limited Partnership subsidiary, and the balance with
available cash.

ITEM 7.   Financial Statements and Exhibits.

(a), (b)  Financial Statements of Businesses Acquired and Pro Forma Financial
Information.

     It is impracticable to provide the historical and pro forma financial
statements for the Business, required by Item 7 of Form 8-K, by the date on
which the report on Form 8-K relating to the above-described acquisition would
be required to be filed under the Securities
<PAGE>
 
Exchange Act of 1934. Such financial statements will be filed with the
Securities and Exchange Commission as soon as practicable, but not later than 60
days after January 15, 1998, the date on which such report on Form 8-K would be
required to be filed.

(c)  Exhibits.

      2   Sale of Business Agreement dated November 20, 1997 between ICI
          Chemicals & Polymers Limited, Imperial Chemical Industries, Terra
          Nitrogen (U.K.) Limited (f/k/a Terra Industries Limited) and Terra
          Industries Inc.

      4   Amended and Restated Credit Agreement dated December 31, 1997 among
          Terra Capital, Inc., Terra Nitrogren, Limited Partnership, Certain
          Guarantors, Certain Lenders, Certain Issuing Banks and Citibank, N.A.
          (without exhibits or schedules).

     99   Ammonium Nitrate Hedge Agreement dated December 31, 1997 between Terra
          International (Canada) Inc. and ICI Chemicals & Polymers Limited.

                                   SIGNATURE

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                    TERRA INDUSTRIES INC.



                              By:  /s/ George H. Valentine
                                   ------------------------------------
                                   George H. Valentine
                                   Senior Vice President, General Counsel
                                     and Corporate Secretary


Date:  January 14, 1998

                                       3

<PAGE>
 
CONFORMED COPY
- --------------
                                                                   EXHIBIT 10.14

                           DATED 20TH NOVEMBER, 1997

                                        
                       ICI CHEMICALS & POLYMERS LIMITED

                       IMPERIAL CHEMICAL INDUSTRIES PLC

                           TERRA INDUSTRIES LIMITED

                                      and

                             TERRA INDUSTRIES INC.


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

                          SALE OF BUSINESS AGREEMENT
                                  RELATING TO
                          THE ICI FERTILIZER BUSINESS
                     ------------------------------------





                                        
                                 ALLEN & OVERY
                                    London
<PAGE>
 
                                   CONTENTS
<TABLE> 
<CAPTION> 
<C>  <S>                                                                    <C> 
Clause                                                                      Page
1.   Interpretation............................................................1
2.   Sale Of Business..........................................................7
3.   Excluded Assets...........................................................9
4.   Consideration And Stocks.................................................10
5.   Conditions Precedent.....................................................11
6.   Contracts................................................................15
7.   Debts And Creditors......................................................17
8.   Apportionments, Prepayments And Discounts................................17
9.   Liabilities..............................................................19
10.  Purchaser's Warranties...................................................21
11.  Seller's Warranties......................................................22
12.  Environmental............................................................26
13.  Completion...............................................................26
14.  Records, Assistance And Accounts.........................................27
15.  Defunct Plant............................................................28
16.  Employees................................................................29
17.  Pensions.................................................................29
18.  Guarantees...............................................................29
19.  Protective Covenants.....................................................30
20.  ICI Roundel..............................................................32
21.  Confidentiality..........................................................32
22.  Independent Accountant...................................................34
23.  Announcements............................................................34
24.  Value Added Tax And Capital Allowances...................................34
25.  Computer Systems.........................................................36
26.  Default Interest.........................................................37
27.  Notices..................................................................37
28.  General..................................................................37
29.  Whole Agreement..........................................................39
30.  Governing Law............................................................40
31.  Jurisdiction.............................................................40

Schedules

1.   Properties...............................................................41
2.   Plant and Equipment......................................................42
3.   Intellectual Property....................................................43
4.   ICI and Terra Individuals................................................45
5.   Excluded Assets..........................................................46
6.   Implementation Agreements................................................47
7.   Warranties...............................................................51
8.   Employees................................................................62
9.   Pensions.................................................................66
10.  Stock Valuation..........................................................79
11.  Environmental............................................................84
12.  Conduct of Business up to Completion.....................................93
Signatories..................................................................122
</TABLE>
<PAGE>
 
Annexes

1.   Implementation Agreements (not in agreed form)
2.   Property Schedule
3.   Property Warranties

Agreed Form Documents

A.   Completion Certificate
B.   Disclosure Letter
C.   Property Documents
D.   Ammonium Nitrate Hedging Agreement
E.   Put Agreement
F.   Guarantee relating to D and E above
G.   Implementation Agreements (Schedule 6)
H.   Employee Notice (Schedule 8, paragraph (1))
<PAGE>
 
THIS AGREEMENT is made on 20th November, 1997 BETWEEN:

(1)  ICI CHEMICALS & POLYMERS LIMITED (registered number 358535), a company
     incorporated under the laws of England, whose registered office is at The
     Heath, Runcorn, Cheshire WA7 4QF (the "Seller");

(2)  TERRA INDUSTRIES LIMITED (registered number 3455690), a company
     incorporated under the laws of England, whose registered office is at 5
     Appold Street, London EC2A 2HA (the "Purchaser");

(3)  IMPERIAL CHEMICAL INDUSTRIES PLC (registered number 218019), a company
     incorporated under the laws of England, whose registered office is at
     Imperial Chemical House, Millbank, London  SW1P 3JF ("ICI"); and

(4)  TERRA INDUSTRIES INC., a corporation incorporated under the laws of the
     state of Maryland, USA whose principal executive office is at 600 Fourth
     Street, P.O. Box 6000, Sioux City, Iowa ("Terra").

WHEREAS:

(A)  The Seller carries on the Business (as defined below).

(B)  The Seller wishes to sell and the Purchaser wishes to purchase the Business
     with a view to carrying on the Business as a going concern in succession to
     the Seller on the terms set out in this agreement.

(C)  The Seller is a wholly owned subsidiary of ICI.

(D)  The Purchaser is a wholly owned subsidiary of Terra.

IT IS AGREED as follows:

1.   INTERPRETATION

(1)  In this agreement:

     "Accounts" means the audited accounts relating to the Business for the
     twelve month periods ended 31st December, 1995 and 31st December, 1996 and
     the unaudited accounts relating to the Business for the nine months ended
     30th September, 1997 (comprising in each case a balance sheet, profit and
     loss account and cash flow statement and related notes), copies of which
     are annexed to the Disclosure Letter and, for the purpose of clause 14(5)
     only, the audited accounts relating to the Business for the twelve months
     ending on 31st December, 1997;

     "Acquired Intellectual Property" means the Business Intellectual Property,
     Licensed Intellectual Property, Non-Exclusive Information and Exclusive
     Information;

     "Affiliate" means in relation to any party, any subsidiary undertaking or
     parent undertaking of that party and any other subsidiary undertaking of
     that parent undertaking for the time being;
<PAGE>
 
     "Agreed Form" means, in relation to any document, the form of that document
     which has been initialled for the purpose of identification by or on behalf
     of the parties to this agreement;

     "Assets" means the several assets relating exclusively or primarily to the
     Business to be sold to the Purchaser under this agreement and described in
     clause 2(1) but excluding the Excluded Assets;

     "Billingham Site Services" means those services which the Seller or any
     relevant member of the Seller's Group supply from the Properties before
     Completion and which the Purchaser or its Affiliates will provide from the
     Properties following Completion pursuant to the Implementation Agreements;

     "Business" means the business carried on by the Seller and any relevant
     member of the Seller's Group at or from the Properties comprising:

     (1)  the production, distribution and sale of:

          (a)  ammonia;

          (b)  nitric acid;

          (c)  ammonium nitrate fertilizers;

          (d)  sodium nitrite;

          (e)  liquid carbon dioxide; and

     (2)  the supply of the Billingham Site Services;

     "Business Day" means a day (other than a Saturday or Sunday) on which banks
     are generally open for normal business in both London and New York;

     "Business Intellectual Property" means all Intellectual Property (other
     than Licensed Intellectual Property) owned by the Seller or any relevant
     member of the Seller's Group and used exclusively in connection with the
     Business together with goodwill relating thereto including, without
     limitation, those shortly described in Part 1 of Schedule 3;

     "Completion" means completion of the sale and purchase of the Assets in
     accordance with clause 13 which shall be deemed to occur at 12 midnight
     London time on the Completion Date;

     "Completion Certificate" means a certificate in the Agreed Form confirming
     the matters described in clause 5(9);

     "Completion Date" has the meaning given in clause 13;

     "Computer Systems" means all computer systems and shall include, but not be
     limited to, computer processors, computer programmes, technical or other
     documentation, 
<PAGE>
 
     telecommunication systems and equipment data entered into,
     created or stored by such computer systems and all other computer related
     hardware, software, or peripherals;

     "Contracts" means all contracts and engagements (other than (i) any leases
     or licences in relation to the Properties and (ii) the contracts relating
     to the Employees) relating exclusively or primarily to the Business entered
     into before Completion, including orders made before Completion, by or on
     behalf of the Seller or any relevant member of the Seller's Group with
     third parties in connection with the Business which remain (in whole or in
     part) to be performed at Completion including, without limitation, all
     orders and contracts for the manufacture, sale or purchase of goods or
     provision or supply of services or for the hire purchase, credit sale,
     leasing or licence of goods or services, or the licensing of Intellectual
     Property and Information and including, without limitation, the Material
     Contracts;

     "Creditors" means all book, trade and other debts (including without
     limitation financial debt) or sums (including credit notes granted) due,
     owing, accrued or payable by the Seller or any of its Affiliates in respect
     of the Business (whether or not then invoiced and whether or not then due
     and payable) which are in respect of the period up to Completion;

     "Customs" means HM Customs & Excise;

     "Debts" means all book, trade and other debts or sums (including suppliers'
     credit notes) due, owing, accrued or payable to the Seller or its
     Affiliates in respect of the Business (whether or not then invoiced and
     whether or not then due and payable) which are in respect of the period up
     to Completion;

     "Default Interest" means LIBOR plus 2 per cent.;

     "Defunct Plant" has the meaning given in clause 15;

     "Disclosure Letter" means the letter to be dated the date of this agreement
     from the Seller to the Purchaser in the Agreed Form and, as the context may
     require, the letter together with additional specific disclosures made
     pursuant to clause 5 which shall be incorporated into the Disclosure Letter
     with effect from the Completion Date;

     "Employees" means those individuals employed by the Seller in the Business
     as set out in the Disclosure Letter;

     "Employment Regulations" means the Transfer of Undertakings (Protection of
     Employment) Regulations 1981;

     "Encumbrance" means any debenture, mortgage, charge, lien, deposit by way
     of security, bill of sale, option or right of pre-emption or other third
     party right (legal or equitable) but excluding licences of Intellectual
     Property or Information;

     "Environmental Claims" means any claims under the environmental warranties
     in paragraph A.6 of Schedule 7 or under the provisions of Schedule 11;

     "Excluded Assets" means the assets or rights referred to in clause 3;

     "Excluded Technologies" means those technologies set out in Part 3 of
     Schedule 3;
<PAGE>
 
     "Exclusive Information" means all Information relating exclusively to the
     Business at Completion including, without limitation, the Information
     listed in Part 4 of Schedule 3;

     "Field of Activity" means the business of sale and manufacture of the
     Products;

     "Goodwill" means the goodwill of the Business with the right to carry on
     the Business in succession to the Seller and any relevant member of the
     Seller's Group but excludes any goodwill or other right in the ICI Roundel;

     "Hedging Agreements" has the meaning given in clause 13(2)(j);

     "ICI Controller's Manuals" means the control manuals which are recorded on
     disk which accompanies the Disclosure Letter or any printed copy made from
     that disk (as more fully described in Schedule 10);

     "Implementation Agreements" means the documents in Agreed Form listed in
     Schedule 6 and those other documents listed in Annex 1 to be entered into
     on the Completion Date;

     "Independent Accountant" has the meaning given in clause 22;

     "Information" means all information owned by the Seller or any other member
     of the Seller's Group relating to the Business including (but without
     limitation) know-how, trade secret, industrial and commercial information
     and techniques including (but not limited to) drawings, formulae, test
     reports, operating and testing procedures, shop practices, instruction
     manuals and tables of operating conditions and including all information
     owned by the Seller or any other member of the Seller's Group relating to
     the supply of any materials to the Business and to the marketing of any
     products or services supplied by the Business, including customer names and
     lists, sales targets, sales statistics, market share statistics, marketing
     surveys and reports, marketing research and any advertising or other
     promotional materials;

     "Intellectual Property Assignment" means the proforma assignment of
     Business Intellectual Property in Agreed Form;

     "Intellectual Property Consent" means the written consents executed by NWS
     Bank plc to the assignment to the Purchaser of the Seller's jointly held
     ownership in the marks "TALISMAN", "TALISMAN GOLD CARD", "CLASSIC" and
     "CLASSIC GOLD";

     "Intellectual Property" means (a) all inventions (whether patentable or
     unpatentable and whether or not reduced to practice), all improvements
     thereto, and all patents, patent applications, and patent disclosures,
     together with all reissuances, continuations, continuations-in-part,
     revisions, extensions, and re-examinations thereof, (b) all trademarks,
     service marks, trade dress, logos and trade names, together with all
     translations, adaptations, derivations and combinations thereof and all
     applications, registrations, and renewals in connection therewith, (c) all
     copyrightable works, all copyrights and all applications, registrations,
     and renewals in connection therewith, (d) all intellectual property rights
     in all computer software (including data and related documentation), (e)
     all other proprietary rights of a similar nature, and (f) all intellectual
     property rights in all copies and tangible embodiments thereof (in whatever
     form or medium);
<PAGE>

     "LIBOR" means the rate for deposits in Pounds Sterling for a period of one
     month which appears on the Reuters Screen ISDA Page at approximately 11.00
     a.m., London time, on the first day of the period to which any interest
     period relates (the "Relevant Date"). If such rate does not appear on the
     Reuters Screen ISDA Page on the Relevant Date, the rate for that Relevant
     Date will be determined as if the parties had specified that the rate for
     the Relevant Date will be determined on the basis of the rates at which
     deposits in Pounds Sterling are offered by Midland Bank plc at
     approximately 11.00 a.m., London time, on the Relevant Date to prime banks
     in the London interbank market for a period of one month commencing on that
     Relevant Date;

     "Licensed Intellectual Property" means Intellectual Property owned by the
     Seller or any member of the Seller's Group and used non-exclusively in
     connection with the Business which is to be licensed by the Seller or the
     relevant member of the Seller's Group to the Purchaser but excluding the
     Excluded Technologies;

     "Material Contracts" has the meaning given in paragraph D(1) of Schedule 7;
     "Non-Exclusive Information" means Information owned by the Seller or any
     member of the Seller's Group and used non-exclusively in connection with
     the Business but excluding the Excluded Technologies;

     "Plant and Equipment" means the plant, machinery, desk top computers, spare
     parts, tools, equipment, tangible chattels, motor vehicles, trailers,
     furniture, fixtures and fittings (to the extent they are not included in
     the Properties) owned by the Seller or any member of the Seller's Group and
     used exclusively or primarily in connection with the Business as at
     Completion including, without limitation, those shortly described in
     Schedule 2;

     "Pounds Sterling", "Pounds" and "(Pounds)" means the lawful currency of the
     United Kingdom;

     "Premises" and "Premises Agreements" has the meaning given in Schedule 1;

     "Products" means ammonia, nitric acid, ammonium nitrate fertilizers, sodium
     nitrite and liquid carbon dioxide;

     "Properties" means the properties short particulars of which are set out in
     Schedule 1 and "Property" means any of them and includes every part of each
     of them;

     "Property Purchase Price" means, in respect of each Property, the
     consideration attributed to that Property as set out in Schedule 1;

     "Property Rights" has the meaning given in Schedule 1;

     "Property Documents" has the meaning given in Schedule 1;

     "Purchaser's Auditors" means Deloitte & Touche, Stonecutter Court, 1
     Stonecutter Street, London EC4A 4TR;

     "Purchaser's Group" means the Purchaser's ultimate parent undertaking and
     that parent undertaking's Affiliates;

<PAGE>
 
     "Purchaser's Solicitors" means Ashurst Morris Crisp of Broadwalk House, 5
     Appold Street, London EC2A 2HA;

     "Records" means:

     (a)  supplier records (but not the records referred to in clause 24(7))
          excluding specific price, rebate and discount information relating in
          large part to supplies procured as part of an arrangement relating to
          any business other than the Business;

     (b)  employee records;

     (c)  management accounting records; and

     (d)  all documents of title to the Assets (but excluding those relating to
          the Properties),

     in each case to the extent that the items are owned by the Seller or any
     relevant member of the Seller's Group at the Completion Date and relate
     exclusively or primarily to the Business;

     "Seller's Auditors" means KPMG Audit plc of 8 Salisbury Square, London EC4V
     7BB;

     "Seller's Group" means the Seller's ultimate parent undertaking and that
     parent undertaking's Affiliates;

     "Seller's Solicitors" means Allen & Overy of One New Change, London EC4M
     9QQ;

     "Shared IT Services Agreement" means the IT Services Agreement of even date
     herewith made between ICI and Terra;

     "Stock Location" has the meaning given in Schedule 10;

     "Stocktake" has the meaning given in Schedule 10;

     "Stocks" means the stocks of fuels, raw materials, ingredients, packaging,
     office and laboratory supplies, revenue engineering spares, consumable
     stores, work in progress and finished goods at Completion belonging to the
     Seller's Group held exclusively or primarily for the purposes of the
     Business;

     "subsidiary" shall have the meaning given in section 736 of the Companies
     Act 1985;

     "subsidiary undertaking" and "parent undertaking" shall have the meanings
     given in section 258 of the Companies Act 1985;

     "Taxation" means all taxes, levies, charges, imposts and withholdings
     wheresoever imposed and having the character of taxation and all penalties,
     charges and interest relating thereto;

     "Terra Individuals" has the meaning given in clause 11(2)(d);

     "Territory" means those countries which at the date of this agreement are
     part of the European Economic Area;
<PAGE>
 
     "VAT" means value added tax; and

     "VAT Element" means the amount of the consideration for any supply of goods
     or services which is attributable to VAT chargeable on that supply.

(2)  Any express reference to an enactment includes references to:

     (a)  that enactment as amended, extended or applied by or under any other
          enactment before or after this agreement;

     (b)  any enactment which that enactment re-enacts (with or without
          modification); and

     (c)  any subordinate legislation made (before or after this agreement)
          under any enactment, including one within (a) or (b) above,

     except to the extent that any of the matters referred to in (a) to (c)
     occurring after the date of this agreement increase or alter the liability
     of any party under this agreement.

(3)  The singular shall include the plural and vice versa and words denoting
     persons shall include bodies corporate and unincorporated associations of
     persons and, unless otherwise stated, shall include the permitted
     successors or assigns of such persons.

(4)  Subclauses (1) to (3) apply unless the contrary intention appears.

(5)  The headings in this agreement do not affect its interpretation.

(6)  Any Schedule, Appendix or Annex to this agreement shall take effect as if
     set out in this agreement and references to this agreement shall include
     its Schedules, Appendices and Annexes.

(7)  Where any statement is qualified by the expression "so far as the Seller is
     aware" or "to the Seller's knowledge, information and belief" or any
     similar statement, that statement shall, unless otherwise provided in this
     agreement, be deemed to mean such knowledge which those officers and
     operational and functional managers of the Seller listed in Part 1 of
     Schedule 4 (and no other persons) had in relation to the matter for which
     they have responsibility or ought to have had in relation to such matter.

(8)  For the purposes of clauses 7(1), 11(6)(b), 11(14), 14(1) and 14(4), where
     the statement "at the Seller's expense" or any similar statement is used
     and for the purpose of clauses 14(3) and 24(8) where the statement "at the
     Purchaser's expense" or any similar statement is used, that statement shall
     be deemed to mean the reimbursement by the Seller or Purchaser (as
     appropriate) of any reasonable out-of-pocket cost by the other party (or
     another member of such party's group) but shall not include any internal
     management time or attributable internal cost of the party to be reimbursed
     (or any other member of the such party's group).

2.   SALE OF BUSINESS

(1)  The Seller shall sell or shall procure the sale by any relevant member of
     the Seller's Group in each case and the Purchaser shall purchase from
     Completion:
<PAGE>
 
     (a)  the Properties (together with the Property Rights);

     (b)  the Plant and Equipment;

     (c)  the Stocks;

     (d)  the benefit (subject to the burden) of the Contracts;

     (e)  the Goodwill;

     (f)  the Business Intellectual Property;

     (g)  to the extent they are capable of transfer to the Purchaser,
          franchises, approvals, permits, governmental licences, orders,
          registrations, certificates, variances, and similar rights obtained
          from governments and governmental agencies which relate exclusively or
          primarily to the Business;

     (h)  the Exclusive Information;

     (i)  all records, books, letters, files, correspondence, lists, plans,
          architectural plans, drawings, specifications, creative materials,
          studies, reports and other documents (or copies or extracts thereof if
          such records or documents do not relate exclusively or primarily to
          the Business) relating to the Business (excluding the VAT records
          referred to in clause 24(7)); and

     (j)  all other assets of the Seller or any relevant member of the Seller's
          Group used, in the case of Business Intellectual Property and
          Exclusive Information, exclusively or, in the case of any other asset,
          exclusively or primarily, in connection with the Business,

     but excluding the assets referred to in clause 3.

(2)  Subject to subclauses (3) and (4), the Seller (or the relevant member of
     the Seller's Group) shall sell the Assets (except the Properties, the
     unregistered Business Intellectual Property and the Exclusive Information)
     with full title guarantee with effect from Completion free from all
     Encumbrances and together with all rights attaching thereto; provided that
     this shall be qualified to the extent that there has been specifically
     disclosed in the Disclosure Letter any Encumbrance or any other matter the
     existence of which reveals that the sale of the relevant Asset cannot be so
     made, in which event the Seller shall sell that Asset (except the
     Properties) with such rights, title and interest as the Seller has in that
     Asset and, for the avoidance of doubt, Part 1 of the Law of Property
     (Miscellaneous Provisions) Act 1994 shall not apply to the extent of such
     disclosure.

(3)  The Properties shall be sold on and subject to the conditions contained in
     Schedule 1.

(4)  The unregistered Business Intellectual Property and the Exclusive
     Information shall be sold with such rights, title and interest as the
     Seller or the relevant member of the Seller's Group has in such Business
     Intellectual Property.
<PAGE>
 
(5)  The Seller and ICI grant to the Purchaser, effective from Completion, an
     irrevocable, perpetual, non-exclusive, royalty free licence to use the
     Licensed Intellectual Property and the Non-Exclusive Information in and for
     the purposes of the Business as carried on by the Seller at Completion. The
     Purchaser may appoint a sub-contractor to carry out, perform and discharge
     some or all of the rights and obligations granted under the licence without
     relieving the Purchaser of primary liability thereunder.

     Further, such licence shall be assignable in whole or in part if the
     assignment forms part of a sale of the whole or part of the Business by the
     Purchaser and the Intellectual Property and Information which is the
     subject of such assignment will be used by the assignee only in and for the
     purpose of the Business, or that part of it, provided that the Purchaser
     will remain primarily liable to the Seller under such licence unless the
     Seller, the Purchaser and any such assignee consent to a novation (or
     partial novation as the case may be) of such licence (or part thereof) such
     consent not to be unreasonably withheld or delayed by the Seller whose
     reasonable legal costs of entering into such novation or partial novation
     as the case may be, will be payable by the Purchaser.

(6)  The Seller undertakes that, if at any time after the date of this
     agreement, the Seller or the relevant member of the Seller's Group executes
     any assignment of all or any part of the Licensed Intellectual Property or
     Non-Exclusive Information, the Seller will or will procure that the
     relevant member of the Seller's Group will notify such assignee (as the
     case may be) of the Purchaser's rights in the same.

(7)  The Seller shall supply to the Purchaser a copy of such of the Non-
     Exclusive Information as the Purchaser may reasonably request.

(8)  Pending Completion the Seller shall, and shall procure that any relevant
     member of the Seller's Group shall, observe the provisions of Schedule 12.

3.   EXCLUDED ASSETS

     Nothing in this agreement shall operate to transfer any assets or rights of
     the Seller, or any of its Affiliates other than those referred to in clause
     2(1) and without limiting the generality of the foregoing there shall be
     expressly excluded and excepted from the sale and purchase and nothing in
     this agreement shall operate to transfer:

     (a)  the statutory books and records of the Seller and the benefit to the
          Seller of this agreement;

     (b)  any cash in hand or at bank (including uncleared cheques received at
          or before  Completion to the extent the same relate to the period up
          to Completion) or bills receivable;

     (c)  the Licensed Intellectual Property (provided that the Purchaser shall
          have the right to use and deal with the Licensed Intellectual Property
          in accordance with clause 2(5));

     (d)  subject to the provisions of clause 5, the benefit of any insurance
          effected by or on behalf of the Seller;

     (e)  those assets listed in Schedule 5;
<PAGE>
 
     (f)  Non-Exclusive Information excluding the goodwill relating thereto;

     (g)  any Debts and all charges, bills, notes and securities, receivable
          therefor;

     (h)  any balances in respect of Taxation relating to the period up to
          Completion;

     (i)  the Defunct Plant; and

     (j)  the Excluded Technologies.

4.   CONSIDERATION AND STOCKS

(1)  Subject to subclause (3), the consideration payable by the Purchaser for
     the sale of the Assets (under or procured under this agreement) shall be
     (Pounds)200,000,000, allocated as follows:

     (a)  for the Properties and the Property Rights the sum of
          (Pounds)8,000,000 to be apportioned as provided in Schedule 1;

     (b)  for the Plant and Equipment, the sum of (Pounds)170,000,000;

     (c)  for the benefit (subject to the burden) of the Contracts, the
          Purchaser's covenant in clause 6;

     (d)  for the Stocks, the sum of (Pounds)12,000,000 adjusted in accordance
          with the provisions of subclause (3);

     (e)  for the Goodwill, the sum of (Pounds)7,000,000;

     (f)  for the Business Intellectual Property, the sum of (Pounds)3,000,000;
          and

     (g)  for the remaining items in clause 2(1), the sum of (Pounds)0.

(2)  The amount of (Pounds)200,000,000 shall be paid in full on Completion.

(3)  (a)  The final purchase price to be paid hereunder for the Stocks shall be
          an amount equal to the value of the Stocks at the Completion Date
          calculated in accordance with the Stocktaking and valuation method set
          out in Schedule 10 (the "Stock Valuation").

     (b)  If the value of the Stocks exceeds (Pounds)12,000,000, the amount of
          such excess shall be due and payable by the Purchaser to the Seller
          within 15 days of the Stock Valuation.

     (c)  If the value of the Stocks is less than (Pounds)12,000,000, the amount
          of such deficit shall be due and payable by the Seller to the
          Purchaser within 15 days of the Stock Valuation.

     (d)  Any amounts due under this subclause (3) shall bear interest at the
          rate of LIBOR plus one per cent. from Completion to the date of
          receipt by the relevant party.
<PAGE>
 
     (e)  Each party shall bear its own costs in connection with the said
          Stocktaking and Stock Valuation.  The fees of the Independent
          Accountant instructed in accordance with Schedule 10 shall be borne
          equally between the Seller and the Purchaser.

(4)  Subject to any express provisions in this agreement to the contrary, the
     consideration for the Business and the Assets and any other sum payable
     hereunder is exclusive of any stamp duty or transfer fees, which, if
     payable, shall be borne by the Purchaser.

5.   CONDITIONS PRECEDENT

(1)  The sale and purchase of the Business is conditional on:

     (a)  the Purchaser not having exercised its right to withdraw from the
          acquisition pursuant to subclause (6) below;

     (b)  the Seller having delivered to the Purchaser confirmation of the
          matters referred to in subclause (5) below; and

     (c)  satisfaction of subclause (2) below.

(2)  Insofar as the proposed acquisition constitutes a concentration with a
     community dimension within the scope of Council Regulation (EEC) 4064/89
     (the "Regulation") the Seller and the Purchaser agree to comply with the
     requirements of the Regulation and not to enter into the proposed
     acquisition until the requirements of the Regulation have been satisfied
     which will be achieved by the occurrence of any of the following events:

     (a)  if the European Commission issues a decision under Article 6(1)(b) of
          the Regulation (or is deemed to have done so under Article 10(6) of
          the Regulation) declaring that the proposed transaction is compatible
          with the common market without imposing any conditions on either the
          Seller's Group or the Purchaser's Group which are deemed by the Seller
          or the Purchaser, as the case may be, in their reasonable opinion to
          be unacceptable; or

     (b)  if the European Commission initiates proceedings pursuant to Article
          6(1)(c) of the Regulation and issues a decision declaring that the
          proposed transaction is compatible with the common market (or is
          deemed to have done so under Article 10(6) of the Regulation) without
          imposing any conditions on either the Seller's Group or the
          Purchaser's Group which are deemed by the Seller or the Purchaser, as
          the case may be, in their reasonable opinion to be unacceptable; or

     (c)  if the proposed transaction has been referred to a competent authority
          of one or more EEA States, such competent authority or authorities
          having issued all authorisations, consents, clearances and approvals
          in respect of the proposed transaction as may reasonably be deemed
          necessary or appropriate by the Seller's Group and the Purchaser's
          Group; or

     (d)  if the European Commission grants a derogation to Article 7(1) of the
          Regulation in respect of the proposed transaction pursuant to Article
          7(4) of the Regulation; or
<PAGE>
 
     (e)  if the European Commission decides not to continue the suspension of
          the proposed transaction pursuant to Article 7(2) of the Regulation.

(3)  Each of the parties shall use reasonable endeavours to procure that the
     conditions in subclause (l) are fulfilled on or before 31st March, 1998
     provided that if subclause (2)(b) is applicable each of the parties shall
     use reasonable endeavours to procure that subclause (2)(b) is fulfilled on
     or before 30th June, 1998.

(4)  If the conditions in subclause (l) are not fulfilled or waived on or before
     the relevant date specified in subclause (3) none of the parties (provided
     it shall have used reasonable endeavours as aforesaid) will have any rights
     or liabilities under this agreement except under clauses 1, 18, 21, 23, 27,
     28(2), 28(5), 29, 30 and 31 which shall survive termination of this
     agreement.

(5)  Not later than 15 Business Days and five Business Days before the
     anticipated Completion Date and also immediately prior to Completion, the
     Seller shall provide the Purchaser with additional specific disclosures
     relating to the matters (if any) between the date of this agreement and the
     Completion Date, the absence of which would make the Warranties untrue (or
     incomplete) as at the Completion Date.

(6)  If there has been a Material Adverse Change (as defined below), the
     Purchaser shall be entitled either to agree to proceed to Completion or to
     withdraw from the acquisition in which latter case the provisions of
     subclause (4) shall apply (as if the conditions in subclause (1) had not
     been fulfilled before the relevant date referred to in subclause (3)).

(7)  If there arises or occurs between the time of execution of this agreement
     on the date hereof and Completion any fact, matter, event or circumstance
     in relation or pertaining to or giving rise to physical loss or damage to
     the Properties or Plant and Equipment which is or might reasonably be
     anticipated to be insured by or otherwise within the ambit of material
     damage Policy P450141/97/0/00 (the "Policy") under which the Seller or any
     member of the Seller's Group is an insured or otherwise has an insurable
     interest or any actual or contingent right of benefit, indemnity or payment
     from the insurer of that policy (the "Insurer"), then the Seller will use
     (and will procure that the relevant members of the Seller's Group use) its
     (and their) best endeavours to make all insurance recoveries (including any
     reinsurance recoveries) and to secure for the Purchaser all available
     benefits and indemnities in respect of the said physical loss or damage
     under the Policy and, subject to Completion, shall transfer all such
     insurance recoveries to the Purchaser and to the extent reasonably
     practicable give the Purchaser the benefit of or a benefit equal to all
     said available benefits and indemnities (in any case net of the reasonable
     costs of recovery from the Insurer and/or reinsurers).

(8)  (a)  The Seller undertakes to the Purchaser that with reference to clause
          5(7), the Seller will (and will procure that the relevant members of
          the Seller's Group will) furthermore:

          (i)  as soon as reasonably practicable (and in any event within any
               time limit set down in the Policy) notify the Insurer in writing
               of the occurrence of an event, fact, matter or circumstance
               giving rise to a claim for physical loss or damage to the
               Properties, Plant and Equipment under the Policy, (at the same
               time delivering to the Purchaser a copy of such written
               notification to the Insurer) and keep the Purchaser regularly and
               fully advised as to the progress 
<PAGE>
 
               of such claim and allow the Purchaser at its election (but
               without obligation) to be consulted in any loss adjustment,
               claims handling and settlement;

          (ii) in the event that and to the extent that any payment is made or
               indemnity or benefit is given by the Insurer to the Seller or any
               member of the Seller's Group in relation to such claim under the
               Policy, forthwith pay to the Purchaser a sum equal to the payment
               received (net of the reasonable costs of recovery from the
               Insurer and/or reinsurers) or utilise, apply or secure for the
               benefit of the Purchaser any such benefit or indemnity.

     (b)  The Seller further irrevocably undertakes to the Purchaser that the
          Seller will forthwith upon execution of this agreement notify the
          Insurer of the provisions of clause 5(7) and of this clause 5(8) and
          will procure that the interest of the Purchaser is noted by the
          Insurer on the Policy.

     (c)  The Seller warrants and represents to the Purchaser that there is no
          impediment or prohibition (legal or otherwise) according to the terms
          of the Policy or according to the terms of any statute or regulation
          applicable to the Insurer or according to any licence or consent
          possessed or required by the Insurer that would prevent or restrict
          the operation of clause 5(7) and this clause 5(8) for the benefit of
          the Purchaser in accordance with the terms hereof including without
          limitation:

          (i)  any restriction or prohibition on the ability of the Seller or
               any relevant of member the Seller's Group to procure the noting
               of the Purchaser's interest; or

          (ii) any restriction or prohibition on the Insurer making any payment
               or giving any benefit or indemnity to the Seller or any member of
               the Seller's Group pursuant to clauses 5(7) and 5(8)(b).

     (d)  The provisions of this clause 5(8) shall only be of effect in respect
          of an event, fact, matter or circumstance occurring during the period
          commencing from the time of execution of this agreement on the date
          hereof until the provisions of clause 13 are satisfied on the
          Completion Date save in respect of any claims or events notified, (or
          of which the Seller was aware but did not notify) to the Insurer on or
          prior to the satisfaction of the provisions of clause 13 on the
          Completion Date.

     (e)  The Seller undertakes to maintain in full force and effect the Policy
          until the satisfaction of the provisions of clause 13 on the
          Completion Date and in the event of any prior renewal or replacement
          of the Policy shall effect such renewal or replacement on at least the
          same terms and conditions of coverage as the Policy with the same
          Insurer and with equivalent reinsurance protections and further
          undertakes that the provisions of 5(8)(b) and 5(8)(c) shall apply to
          any such policy as if it were the Policy.

(9)  If there has been a breach of Warranty, by reference to the facts
     subsisting at the date of this agreement or at Completion or a breach of
     Schedule 12 but there has not been a Material Adverse Change (as defined
     below), then:

<PAGE>
 
     (a)  in the case of a breach of Warranty arising only upon its repetition
          at Completion and by reason of matters outside the Seller's control,
          the Seller, if it elects to remedy the breach of Warranty by reference
          to insurance recoveries, will use (and will procure that the relevant
          members of the Seller's Group use) its (and their) best endeavours to
          make all insurance recoveries (including any reinsurance recoveries)
          and to secure for the Purchaser all available benefits and indemnities
          in respect of the physical loss or damage to the Properties, Plant and
          Equipment under the Policy and, subject to Completion, shall transfer
          such insurance recoveries to the Purchaser and to the extent
          reasonably practicable give the Purchaser the benefit of or a benefit
          equal to all said available benefits and indemnities (in any case net
          of the reasonable costs of recovery from the Insurer and/or
          reinsurers).  The Seller further undertakes that the Seller will (and
          will procure that the relevant members of the Seller's Group will)
          comply with the provisions of clause 5(8)(a) above.  This provision
          shall only apply to insurance proceeds recoverable in respect of
          physical loss or damage to the Properties, Plant and Equipment
          occurring in the period between the time of execution of this
          agreement on the date hereof and Completion; and

     (b)  in any other case the Seller shall, in respect of a breach of Warranty
          at the date of this of agreement or such a breach which arises between
          the date of this agreement and the Completion Date, remedy the matter
          or, if the matter is not remediable prior to Completion or is in
          respect of a breach of Warranty at Completion or breach of Schedule 12
          prior to Completion, be liable in damages for breach of Warranty or
          for failing to comply with Schedule 12 (if applicable).

(10) The Purchaser's right to withdraw under subclause (6) is its sole remedy
     under this agreement in the event of a Material Adverse Change.

(11) The Seller shall provide a Completion Certificate in the Agreed Form to the
     Purchaser at Completion confirming, as appropriate, that:

     (a)  the Warranties are true as at the Completion Date subject to the
          matters disclosed pursuant to subclause (5) above (which shall be
          incorporated into the Disclosure Letter);

     (b)  the covenants given under Schedule 12 have been complied with or, if
          they have not been complied with, details of such non-compliance; and

     (c)  there has been no Material Adverse Change.

(12) For the purposes of this clause a "Material Adverse Change" means a change,
     whether inside or outside the Seller's control, whether relating to the
     Business or generally, which shows a deterioration in the aggregate value
     of the Business in the period from the date of signature of this agreement
     (on the assumption that the Warranties were, subject to the Disclosure
     Letter at the date hereof, correct at the date of this agreement) to the
     (scheduled) Completion Date of 10 per cent or more. In the event of dispute
     as to whether there has been a Material Adverse Change, either party may
     refer the matter for resolution by the courts of England pursuant to the
     provisions of clause 31.

(13) If the matter is referred to the courts pursuant to subclause (10), the
     Seller will continue to perform the covenants in Schedule 12 pending final
     determination.  If the final determination 
<PAGE>
 
     is that a Material Adverse Change did occur, the Purchaser's sole remedy
     shall be to withdraw in accordance with subclause (6) subject to any award
     for costs which the court may make. If the final determination is that a
     Material Adverse Change did not occur then Completion shall take place 30
     Business Days following the final determination and the Warranties and
     Disclosure Letter will be treated as having been given as at the original
     scheduled Completion Date and shall not be repeated or speak from the
     actual later Completion Date. This shall be the Seller's sole remedy
     subject to any award for costs which the court may make.

6.   CONTRACTS

(1)  As part of the consideration for the sale and purchase of the Assets the
     Purchaser shall from Completion:

     (a)  accept assignments from the Seller (or other members of the Seller's
          Group, or both, as the case may be) of the Contracts or join with the
          Seller in procuring a novation of the Contracts;

     (b)  carry out, perform and discharge all the obligations and liabilities
          created by or arising under the Contracts and which, under the terms
          of the relevant Contract, are (in whole or in part) to be performed
          after Completion; and

     (c)  indemnify the Seller against all actions, proceedings, costs, damages,
          claims and demands in respect of any failure on the part of the
          Purchaser to carry out, perform and discharge those obligations and
          liabilities.

(2)  The Seller shall from Completion indemnify the Purchaser against all
     actions, proceedings, costs, damages, claims and demands in respect of any
     failure on the part of the Seller to carry out, perform and discharge all
     the obligations and liabilities created by or arising under the Contracts
     and which, under the terms of the relevant Contract, should have been
     carried out, performed or discharged prior to Completion.

(3)  Insofar as the benefit or burden of any of the Contracts cannot effectively
     be assigned to the Purchaser as set out in subclause (1) except by an
     agreement or novation with or consent to the assignment from the person,
     firm or company concerned:

     (a)  the Seller shall at the Purchaser's request use all reasonable
          endeavours with the co-operation of the Purchaser to procure such
          novation or assignment;

     (b)  until the Contract is novated or assigned the Seller shall hold it in
          trust for the Purchaser absolutely and the Purchaser shall (if such
          sub-contracting is permissible and lawful under the Contract), as the
          Seller's sub-contractor, carry out, perform and discharge all the
          obligations and liabilities of the Seller under the Contract to be
          carried out, performed or discharged after Completion (subject to
          receiving the benefit of such Contract) and shall indemnify the Seller
          against all actions, proceedings, costs, damages, claims and demands
          in respect of any failure on the part of the Purchaser to perform
          those obligations; and

     (c)  until the Contract is novated or assigned the Seller shall (so far as
          it lawfully may) give all reasonable assistance to the Purchaser (at
          the Purchaser's request) to enable 

<PAGE>
 
          the Purchaser to enforce its rights under the Contract. If the
          Contract prohibits the Purchaser from acting as the Seller's sub-
          contractor (as referred to in paragraph (b) above) or the Purchaser
          cannot be permitted to act as sub-contractor because of
          confidentiality obligations, the Seller shall, at the cost of the
          Purchaser and to the extent that the Seller is reasonably able, do all
          such acts and things as the Purchaser may reasonably require to enable
          due performance of the Contract and to provide for the Purchaser the
          benefit, subject to the burden, of the Contract. For the purpose of
          this paragraph and paragraph (b) above, it shall not be reasonable to
          require the Seller to make any payment unless the Purchaser has first
          paid the Seller sufficient cleared funds to make such payment. For the
          purpose of complying with this paragraph (c) the parties shall bear
          their own costs except that the Seller shall pay any reasonable out of
          pocket expenses of the Purchaser.

(4)  Insofar as the benefit or burden of any licence of Intellectual Property
     (other than copyright in computer programmes which shall be dealt with
     under the provisions of clause 25) or Information (including without
     limitation a part of such licence as the case may be) that is not, nor
     forms part of, a Contract and that is necessary for the Business as
     performed by the Seller at Completion (a "Necessary Licence") cannot
     effectively be assigned to the Purchaser except by an agreement or novation
     with or consent to the assignment from the person, firm or company
     concerned:

     (a)  the Seller shall at the Purchaser's request use all reasonable
          endeavours with the co-operation of the Purchaser to procure such
          novation or assignment;

     (b)  until the Necessary Licence is novated or assigned the Seller shall
          hold it in trust for the Purchaser absolutely and the Purchaser shall
          (if such sub-contracting is permissible and lawful under the terms and
          conditions of the Necessary Licence), as the Seller's sub-contractor,
          carry out, perform and discharge all the obligations and liabilities
          of the Seller under the Necessary Licence to be carried out, performed
          or discharged after Completion (subject to receiving the benefit of
          such Necessary Licence) and shall indemnify the Seller against all
          actions, proceedings, costs, damages, claims and demands in respect of
          any failure on the part of the Purchaser to perform those obligations;
          and

     (c)  until the Necessary Licence is novated or assigned the Seller shall
          (so far as it lawfully may) give all reasonable assistance to the
          Purchaser (at the Purchaser's request) to enable the Purchaser to
          enforce its rights under the Necessary Licence.  If the Necessary
          Licence prohibits the Purchaser from acting as the Seller's sub-
          contractor (as referred to in paragraph (b) above) or the Purchaser
          cannot be permitted to act as sub-contractor because of
          confidentiality obligations, the Seller shall, at the cost of the
          Purchaser and to the extent that the Seller is reasonably able, do all
          such acts and things as the Purchaser may reasonably require to enable
          due performance of the Necessary Licence and to provide for the
          Purchaser the benefit, subject to the burden, of the Necessary
          Licence.   For the purpose of this paragraph and paragraph (b) above,
          it shall not be reasonable to require the Seller to make any payment
          unless the Purchaser has first paid the Seller sufficient cleared
          funds to make such payment.  For the purpose of complying with this
          paragraph (c) the parties shall bear their own costs except that the
          Seller shall pay any reasonable out of pocket expenses of the
          Purchaser.

<PAGE>
 
7.   DEBTS AND CREDITORS

(1)  The Seller shall collect the Debts for its own account and the Purchaser
     shall give reasonable assistance at the Seller's expense to the Seller to
     enable the Seller to collect the Debts.  The Parties shall co-operate to
     ensure that in all aspects, including the application of payments and
     dealing with defaulting debtors, debtors are treated in a manner which is
     consistent with the Seller's previous practice.

(2)  The Purchaser shall account to the Seller for any Debts paid to it within
     14 days of receipt.  If a payment is received by the Purchaser from a
     person who owes any of the Debts and who is also a debtor of the Purchaser,
     it shall be applied (notwithstanding any direction of the debtor) in
     discharge of the earliest undischarged debt due from that person to the
     Seller or the Purchaser.

(3)  Any sums received by the Purchaser in respect of any of the Debts shall be
     held on trust by the Purchaser for the Seller on the terms of this clause.

(4)  If a payment is received by the Seller from a person who is a debtor of the
     Purchaser in respect of the Business carried on after the Completion Date,
     the Seller shall account to the Purchaser in respect of such amount within
     14 days of receipt.  Any such sums received by the Seller shall be held on
     trust by the Seller for the Purchaser.

(5)  The Seller shall discharge the Creditors and shall indemnify the Purchaser
     against all costs, claims, demands, proceedings, expenses and liabilities
     in respect of them.

(6)  The Purchaser shall discharge all creditors (as defined in the next
     sentence) and shall indemnify the Seller against all costs, claims,
     demands, proceedings, expenses and liabilities in respect of them.  In this
     subclause (6) "creditors" means all book, trade and other debts (including
     without limitation financial debt) or sums (including credit notes granted)
     in respect of the Business which arise in respect of the period from
     Completion.

8.   APPORTIONMENTS, PREPAYMENTS AND DISCOUNTS

(1)  For the avoidance of doubt all periodical charges and periodical outgoings
     of the Business including but not limited to rents, rates, non-customer
     rebates, gas, electricity, telephone and water charges and all liabilities
     in relation to salaries, wages, employee bonus entitlements, national
     insurance and pension contributions and accrued holiday pay and holiday
     entitlements (but for the avoidance of doubt this shall not include any
     entitlement to redundancy payments or any other obligation in respect of an
     Employee's period of continuous service) shall be apportioned on a time
     basis so that such part of the relevant charges attributable to the period
     ending on Completion shall be borne by the Seller and such part of the
     relevant charges attributable to the period commencing on the day
     immediately following Completion shall be borne by the Purchaser.  All
     rents, licence fees, royalties and other periodical receipts of the
     Business shall be apportioned between the Seller and the Purchaser on a
     like basis.

(2)  As soon as practicable after Completion (and in any event not later than 45
     Business Days after Completion) the Purchaser (with the assistance of the
     Seller as the Purchaser may reasonably request) shall prepare a schedule of
     the apportionment of costs and outgoings described in subclause (1) above
     (excluding employee bonus entitlements) and either the 
<PAGE>
 
     Seller or the Purchaser (as the case may require) shall (within 15 Business
     Days of such schedule being prepared) pay to the other an amount equal to
     the net liability shown in such schedule; in the case of employee bonus
     entitlements the Purchaser shall prepare schedules of the apportionment of
     the employee bonus payments as soon as reasonably practicable after the
     period in which the employee bonus entitlements accrue and the bonus
     entitlements have been calculated and the Seller shall (within 15 Business
     Days of such schedules being prepared) pay to the Purchaser the amounts
     payable by the Seller shown in such schedules.

(3)  All prepayments and payments in advance (excluding the amount of any VAT
     Element thereof to the extent that the Seller or the representative member
     of any VAT group of which the Seller is a member is required to account to
     Customs for such VAT) made to the Seller in the ordinary course of business
     prior to the Completion Date in respect of goods which are to be supplied
     or services which are to be provided by the Purchaser after the Completion
     Date, liability for which is to be assumed by the Purchaser under this
     agreement, shall be paid by the Seller to the Purchaser and a schedule of
     all such prepayments and payments in advance shall, as soon as practicable
     on or after the Completion Date and in any event not later than 45 Business
     Days after the Completion Date, be prepared by the Seller (with such
     assistance of the Purchaser as the Seller shall reasonably request) as at
     the Completion Date and the Seller shall, subject to the provisions of
     subclause (5) below, on the Completion Date or as soon as practicable
     thereafter pay to the Purchaser an amount equal to the amount of the
     liability shown in such schedule.

(4)  All prepayments and payments in advance (excluding any VAT Element thereof
     which is recovered by the Seller or the representative member of any VAT
     group of which the Seller is a member) made by the Seller in the ordinary
     course of business prior to the Completion Date in respect of goods to be
     supplied or services to be provided to the Purchaser after the Completion
     Date, the benefit of which the Purchaser shall receive under this
     agreement, shall be reimbursed to the Seller by the Purchaser and a
     schedule of such prepayments and payments in advance shall, as soon as
     practicable on or after the Completion Date (and in any event not later
     than 45 Business Days after the Completion Date), be prepared by the Seller
     (with such assistance of the Purchaser as the Seller shall reasonably
     request) as at the Completion Date, and the Purchaser shall, subject to the
     provisions of subclause (5) below, on the Completion Date or as soon as
     practicable thereafter pay to the Seller an amount equal to the amount of
     the liability shown in such schedule.

(5)  In the event that the Purchaser disputes the accuracy of the schedule(s)
     prepared by the Seller in accordance with subclauses (2), (3) or (4) above
     it shall pay or require the Seller to pay, as the case may be, the amount
     which is not in dispute forthwith and in the event that the Seller and
     Purchaser are unable to agree to such schedule(s) within fifteen (15)
     Business Days of the receipt of the relevant schedule(s) the Purchaser may
     refer the matter to an Independent Accountant in accordance with clause 22
     and the Independent Accountant shall be instructed to make such
     determination as soon as practicable and in any event within 45 Business
     Days of being instructed) and the Seller or the Purchaser (as appropriate)
     shall pay the balance so determined within 15 Business Days of such
     determination. In the event that any such dispute is so referred to such
     Independent Accountant each of the Seller and the Purchaser shall bear 50
     per cent. of the costs of such referral unless the Independent Accountant
     determines otherwise.

(6)  Notwithstanding anything suggesting the contrary contained in this
     agreement, the Seller shall remain responsible for paying customer
     discounts (on the basis set out below) which
<PAGE>
 
     accrue in respect of sales made in the period up to Completion and the
     Purchaser shall be responsible for paying customer discounts which accrue
     in respect of sales made in the period after Completion.

(7)  In respect of any discounts (including, for this purpose, any volume
     related payments) which apply in respect of sales made both before
     Completion by the Seller and after Completion by the Purchaser, the
     Purchaser shall promptly following the expiry of the period to which they
     relate inform the Seller of the same and shall provide the Seller with a
     calculation of how much of such discount is payable by the Seller and how
     much by the Purchaser.  Such calculation shall be made according to the
     discount structure by applying the ratio of volume of the Seller's sales
     pre-Completion to the volume of the Purchaser's sales post-Completion to
     the total discount due therefor.  The total discount due in respect of the
     total discount period shall be calculated in line with the contract
     conditions existing at Completion and shall be pro-rated between the
     Purchaser and Seller according to the said ratio notwithstanding that the
     discount is expressed on a differential basis (e.g. even though a higher
     discount may be payable once sales pass a certain figure the parties shall
     assume that the total discount due is evenly spread across the total volume
     to which the discount pertains).  Unless the Seller questions the accuracy
     of such calculation (in which case they shall be entitled to receive
     sufficient information to enable them to verify the same) such calculation
     shall be used by the Seller and the Purchaser for the purposes of settling
     the discount due in each case.  The Seller shall pay to the Purchaser the
     discount payable by the Seller in accordance with the above calculation
     prior to the date on which it is payable by the Purchaser.

(8)  In the event that the Purchaser wishes to change an existing discount
     scheme it shall first bring to an end the existing scheme and make the
     calculations under subclause (7) in respect of the period up to the date on
     which the scheme is ended.

(9)  Disputes under subclauses (6), (7) or (8) may be referred by either party
     to the Independent Accountant pursuant to the provisions of clause 22.

9.   LIABILITIES

(1)  The Seller undertakes to indemnify and keep indemnified the Purchaser
     against all claims by third parties giving rise to losses, costs,
     liabilities, proceedings, claims, demands and expenses (including
     reasonable legal fees) (together "Liabilities") which may be incurred by
     the Purchaser, or to which the Purchaser may become subject, and which
     arise as a result of the operation of the Business by the Seller (or any of
     its Affiliates) prior to Completion (whether the Liabilities are accrued,
     absolute, contingent, known or unknown at the Completion Date) other than
     as provided in clause 9(2) or the Implementation Agreements, but including
     without limitation Liabilities arising as a result of:

     (a)  the Seller's failure (or that of any of its Affiliates) to comply with
          any relevant and legally enforceable corporate or other laws, rules,
          ordinances, regulations with respect to the operation of the Business
          by the Seller (or any of its Affiliates) prior to Completion;

     (b)  any liability to Taxation in respect of the period prior to
          Completion;
<PAGE>
 
     (c)  the Seller's failure (or that of any of its Affiliates) to obtain any
          required relevant governmental or regulatory permit, licence, consent
          or other authorisation or renewal or variation thereof with respect to
          the operation of the Business by the Seller (or any of its Affiliates)
          prior to Completion;

     (d)  any breach of contract, tort, product liability or other claim arising
          from or with respect to, the operation of the Business by the Seller
          (or any of its Affiliates) prior to Completion;

     (e)  any suit, action, arbitration, charge, governmental investigation,
          claim, litigation or proceedings  arising as a result of the operation
          of the Business prior to Completion;

     (f)  any liabilities of the Business arising in connection with any
          Excluded Assets;

     (g)  any fines and/or penalties and/or damages which are imposed by the
          Commission of the European Communities (the "Commission") and/or the
          EFTA Surveillance Authority (the "ESA") or which result from any
          judgement, order or direction (including without limitation any
          interlocutory, injunctive or other relief) made by any court, tribunal
          or other regulatory body (including the Commission and the ESA) in
          respect of any infringements by the Business of Articles 85 and/or 86
          of the Treaty establishing the European Community and/or their
          equivalent provisions under the European Economic Area Agreement,
          which arise from the entry into of agreements by the Business prior to
          Completion and/or any conduct or omissions on the part of the Business
          prior to Completion in connection with such agreements, and all
          reasonable costs and expenses which the Purchaser or any member of the
          Purchaser's Group may incur in responding to or defending any
          Commission and/or ESA inquiry or proceeding or any other proceedings
          before a court, tribunal or other regulatory body in relation to such
          infringements or alleged infringements; and

     (h)  any amount owing to any member of the Seller's Group.

(2)  The indemnity in subclause (1) shall not apply:

     (a)  in relation to Contracts, to which the provisions of clause 6 shall
          apply;

     (b)  in relation to Debts and Creditors, to which the provisions of clause
          7 shall apply;

     (c)  in relation to VAT, to which the provisions of clause 24 shall apply;

     (d)  in relation to Employees, to which the provisions of Schedule 8 shall
          apply;

     (e)  in relation to pensions, to which the provisions of Schedule 9 shall
          apply; or

     (f)  in relation to Environmental Liabilities (as defined in Schedule 11),
          to which the provisions of Schedule 11 shall apply.

(3)  Save as expressly stated otherwise in this agreement the Purchaser
     undertakes to indemnify and hold harmless the Seller from and against all
     Liabilities which may be incurred by the Seller (or any of its Affiliates),
     or to which the Seller (or any of its Affiliates) may become subject, and
     which arise as a result of the operation of the Business after Completion
     (other 
<PAGE>
 
     than Liabilities expressly retained by the Seller under this agreement) and
     any and all actions suits, proceedings, claims, demands, assessments and
     judgements with respect to the foregoing.

10.  PURCHASER'S WARRANTIES

 The Purchaser and Terra each warrants to the Seller that:

     (a)  it (and each of its Affiliates, in respect of the Implementation
          Agreements and the other agreements entered into pursuant to this
          agreement to which it is a party) has the requisite power and
          authority to enter into and to perform this agreement, such
          Implementation Agreements and the other agreements entered into
          pursuant to this agreement;

     (b)  it (and each of its Affiliates, in respect of the Implementation
          Agreements and the other agreements entered into pursuant to this
          agreement to which it is a party)  has obtained or satisfied all
          corporate, regulatory and other approvals, or any other significant
          conditions, necessary to execute and perform this agreement, such
          Implementation Agreements and the other agreements entered into
          pursuant to this agreement;

     (c)  this agreement, the Implementation Agreements and the other agreements
          entered into pursuant to this agreement constitute (or, when executed,
          will constitute) valid and binding obligations of the Purchaser (and
          each of its Affiliates, in respect of the Implementation Agreements
          and the other agreements entered into pursuant to this agreement to
          which it is a party) enforceable in accordance with their terms;

     (d)  compliance with the terms of this agreement, the Implementation
          Agreements and the other agreements entered into pursuant to this
          agreement by the Purchaser or its Affiliates (as appropriate) will:

          (i)   not constitute a breach of any agreement or contract to which
                the Purchaser or such Affiliate is a party or by which it is
                bound;

          (ii)  be in compliance with the Purchaser's or such Affiliate's
                memorandum and articles of association or other constitutional
                documents; and

          (iii) not contravene any order, judgement, decree or regulation or any
                other restriction of any kind by which the Purchaser or such
                Affiliate is bound; and

     (e)  each of the Purchaser and Terra:

          (i)   is a company, duly incorporated and subsisting under the laws of
                England and Wales and the State of Maryland, USA, respectively;
                and

          (ii)  is not in liquidation, administration or administrative
                receivership, nor has any resolution been passed by the
                shareholders or creditors to put either of the companies into
                liquidation, administration or administrative receivership (and
                has not done or suffered in any jurisdiction other than England
                and Wales, anything equivalent to the things referred to in this
                subparagraph (ii)).
<PAGE>
 
11.  SELLER'S WARRANTIES

(1)  The Seller warrants to the Purchaser that, save as otherwise stated in this
     agreement and subject to all matters and circumstances disclosed in the
     Disclosure Letter, each of the statements set out in Schedule 7 to this
     agreement (the "Warranties") are true and accurate as at the date of this
     agreement and at Completion (by reference to the facts and circumstances
     then subsisting).

(2)  The Purchaser acknowledges and agrees that:

     (a)  no representations, warranties, collateral contracts or other
          assurances of any kind  (express or implied) have been given by or on
          behalf of the Seller or any member of the Seller's Group and on which
          the Purchaser may rely in entering into this agreement except for the
          Warranties and, in particular, but without prejudice to the generality
          of the foregoing, no member of the Seller's Group makes any express or
          implied representation or warranty (other than the Warranties) as to
          the physical condition or suitability for any particular purpose of
          any of the Assets, individually or collectively, which are otherwise
          being purchased "as is, where is" at the time of Completion;

     (b)  no other statement, promise or forecast made by or on behalf of the
          Seller or any member of the Seller's Group (except in instances of
          fraud) may form the basis of, or be pleaded in connection with, any
          claim by the Purchaser under or in connection with this agreement or
          the Implementation Agreements (save as set out in such agreements);

     (c)  any claim by the Purchaser or any person deriving title from it in
          connection with the Warranties (a "Warranty Claim") shall be subject
          to the following provisions of this clause; and

     (d)  at the time of entering into this agreement none of the individuals
          set out in Part 2 of Schedule 4 (the "Terra Individuals") are aware
          that the Purchaser will at the date of this agreement or at Completion
          be entitled to bring a Warranty Claim.

(3)  The liability of the Seller under or in respect of the Warranties or under
     Schedule 11 shall be limited as follows:

     (a)  there shall be disregarded for all purposes any breach of the
          Warranties or liability under Schedule 11 in respect of which the
          amount of the damages (or other payment) to which the Purchaser would
          otherwise be entitled is less than (Pounds)50,000 (excluding interest,
          costs and expenses) provided that any series of claims arising from
          the same or similar circumstances shall be treated as a single claim
          for these purposes and to the extent that the claim(s) is satisfied by
          the Seller from insurance proceeds a series of claims or events or a
          single claim or event shall be interpreted in accordance with the
          terms and conditions of the Policy referred to in 5(7);

     (b)  the Purchaser shall not be entitled to recover any damages (or other
          payment) in respect of any breach or breaches of the Warranties until
          the amount of damages in respect of such breach or breaches (together
          with any liability on the part of the 
<PAGE>
 
          Seller and all members of the Seller's Group under Schedule 11)
          exceeds in aggregate the sum of (Pounds)1,000,000 in which event the
          Purchaser shall be entitled to recover the whole of such amount and
          not just the excess;

     (c)  the maximum aggregate liability of the Seller and all members of the
          Seller's Group in respect of all and any Warranty Claims (other than
          Environmental Claims) shall not exceed (Pounds)100,000,000;

     (d)  the maximum aggregate liability of the Seller and all members of the
          Seller's Group in respect of all and any Environmental Claims shall
          not exceed (Pounds)100,000,000;

     (e)  in respect of any liability which is contingent, unless and until such
          liability becomes an actual liability and is due and payable provided
          that recovery for claims associated with a contingent liability in
          existence prior to the Expiration Date shall still be permitted when
          actual liability does not become due and payable until after the
          Expiration Date if notice of the contingent liability has been given
          in accordance with subclauses (6) and (7) below.

(4)  The Purchaser acknowledges and agrees that:

     (a)  no liability shall attach to the Seller by reason of any breach of any
          of the Warranties to the extent that the loss has been recovered by
          the Purchaser under Schedule 11 or any other term of this agreement or
          any other document referred to herein and accordingly the Purchaser
          may only recover once in respect of the same loss;

     (b)  the Seller shall not be liable for breach of any Warranties or under
          Schedule 11 or any other term of this agreement to the extent that the
          subject of the claim has been or is made good or is otherwise
          compensated for without cost, expense or loss to the Purchaser in a
          manner reasonably acceptable to the Purchaser; and

     (c)  in calculating the liability of the Seller for any breach of the
          Warranties or under Schedule 11 there shall be taken into account the
          amount by which any taxation for which the Purchaser is now or will in
          the future be accountable or liable to be assessed is or will be
          reduced or extinguished as a result of the matter giving rise to such
          liability.

(5)  The Purchaser shall not be entitled to make any Warranty Claim:

     (a)  to the extent that provision or allowance for the matter or liability
          which would otherwise give rise to the claim in question is taken
          account of or reflected in the determination of the Stock Valuation;

     (b)  in respect of anything fairly disclosed in the Disclosure Letter
          (which, with respect to the Warranties given as at the date of this
          agreement, shall, for the avoidance of doubt, exclude any additional
          specific disclosures after the date of this agreement and, with
          respect to the Warranties given at the date of Completion, will
          include the benefit of additional specific disclosures made pursuant
          to clause 5);

     (c)  if the claim would not have arisen but for a change in (or in the
          judicial interpretation of) or an enactment or repeal of legislation
          or regulation, or the introduction, change 
<PAGE>
 
          in or cessation of the published practice of any taxation authority
          taking effect after the date of this agreement;

     (d)  to the extent that the claim arises as a result only of any change
          after Completion in the accounting bases upon which the Business
          values its assets or computes its profits or arises as a result of the
          taxation or accounting policies, bases or practices of the Purchaser
          being different to those adopted or used in preparing the Accounts
          (except to the extent that such change is made as a result of the
          Accounts not being as warranted in paragraph B(1) of Schedule 7); or

     (e)  to the extent that the claim arises as a result of a circumstance
          which arose:

          (i)  prior to Completion with the written consent of the Purchaser; or

          (ii) due to any voluntary act or omission of the Purchaser after
               Completion which was outside the ordinary course of business,
               which the Purchaser knew would result in a breach of Warranty and
               the primary intention of which was to create a claim for breach
               of Warranty.

          Notwithstanding any other provision of this agreement, the Purchaser
          shall be deemed not to have any notice of any matters which might be
          disclosed in any fire certificates or planning provisions which may
          have been available to the Purchaser or its advisers.

(6)  If any of the directors of the Purchaser or senior management of Terra
     become aware that the Purchaser is entitled to make a  Warranty Claim or a
     claim in respect of any indemnity by the Seller under this agreement
     (except in relation to claims under the indemnities set out in Schedule 11)
     the Purchaser shall give notice to the Seller within 30 days of  such
     person or persons becoming aware of any such matter specifying (in
     reasonable detail) the matter which gives rise to the claim, the nature of
     the claim and the amount claimed in respect thereof (including the
     Purchaser's calculation of the loss thereby alleged to have been suffered
     by it) provided that the Purchaser shall not lose any rights to bring a
     Warranty Claim or a claim in respect of any indemnity by reason of failing
     to give such a notice unless and except to the extent that the Seller's
     liability is increased as a result of such failure.  If the Warranty Claim
     or claim in respect of an indemnity in question is as a result of or in
     connection with a liability or alleged liability to a third party:

     (a)  the Purchaser shall make no admission of liability, agreement,
          settlement or compromise with any third party in relation to any such
          liability or alleged liability without the prior written consent of
          the Seller (such consent not to be unreasonably withheld or delayed),
          and the Purchaser shall (subject to being indemnified by the Seller
          against all reasonable costs, claims and liabilities arising in
          connection therewith) take such action to avoid, mitigate, dispute,
          resist, appeal, settle, compromise or contest the liability as may be
          reasonably requested by the Seller (provided any such actions would
          not be prejudicial to its ongoing business interests in a material
          respect);

     (b)  the Purchaser shall make available to the Seller, at the Seller's
          expense, such persons and all such access and information as the
          Seller may reasonably require for 
<PAGE>
 
          avoiding, disputing, resisting, appealing, compromising or contesting
          any such liability.

(7)  The Seller shall cease to have any liability under or in respect of the
     Warranties (other than the Warranties in respect of environmental matters
     to which the time limitations in Schedule 11 shall apply) on the date two
     years from Completion (the "Expiration Date") in respect of any Warranties
     except in respect of a Warranty Claim of which the Purchaser gives notice
     to the Seller before the relevant date and in accordance with subclause (6)
     above but the liability of the Seller in respect of any Warranty Claim
     shall absolutely terminate if proceedings in respect of it have not been
     commenced within 12 months of service of notice of that Warranty Claim (and
     for this purpose proceedings shall not be deemed to have been commenced
     unless they have been properly issued and validly served upon the Seller);
     provided, however, that such limitation on liability shall not apply with
     respect to Warranties relating to the ownership of assets and due
     authorisation of this agreement, the Implementation Agreements and
     transactions contemplated thereby.

(8)  Without prejudice to the Purchaser's duty to mitigate any loss in respect
     of any breach of the Warranties or in respect of any claim under Schedule
     11 if in respect of any matter which would otherwise give rise to a breach
     of the Warranties or a claim under Schedule 11 the Purchaser is entitled to
     claim under any policy of insurance  then the Purchaser shall use all
     reasonable endeavours to pursue such insurance claim and the amount of any
     insurance monies recovered by the Purchaser (net of taxes and costs of
     recovery and excluding returns of premium (if any)) shall reduce to that
     extent or extinguish the claim for breach of the Warranties or the amount
     indemnified under Schedule 11.

(9)  If the Seller or any member of the Seller's Group makes any payment by way
     of damages for breach of the Warranties (the "Damages Payment") and the
     Purchaser receives any benefit otherwise than from the Seller or that
     member which would not have been received but for the circumstance giving
     rise to the claim in respect of which the Damages Payment was made the
     Purchaser shall, once it has received such benefit, forthwith repay to that
     Seller or member an amount equal to the lower of the amount of such benefit
     and the Damages Payment net of taxes and the cost of recovery.

(10) The Purchaser shall not be entitled to rescind or terminate this agreement
     after Completion in any circumstances provided that nothing in this
     subclause shall exclude or limit any liability for fraud.

(11) Any payment made by the Seller in respect of a breach of the Warranties or
     under any indemnity shall be deemed to be a reduction in the consideration
     for the sale of the Business.

(12) References to the Seller shall include any member of the Seller's Group
     which might have any liability with respect to the Warranties or under any
     indemnity.

(13) The Purchaser shall not be entitled to claim for punitive damages in
     respect of any Warranty Claim or in respect of a claim in respect of any
     indemnity by the Seller under this agreement.

(14) The Purchaser shall take reasonable steps at the Seller's expense (provided
     such expenses are taken into account when calculating damages) to avoid or
     mitigate any loss or damage which may give rise to a claim under or in
     connection with this agreement, whether arising in contract, tort
     (including, without limitation, negligence) or otherwise howsoever arising.
<PAGE>
 
(15) The Seller shall have no liability under or in connection with this
     agreement whether arising in contract, tort (including, without limitation,
     negligence or otherwise howsoever arising) save in relation to the
     Warranties  and as otherwise expressed in this agreement.

(16) The Seller and ICI, on behalf of themselves and each member of the Seller's
     Group, waive any and all claims which they or any member of the Seller's
     Group might otherwise have against any of the Employees, to the intent that
     this subclause (16) shall be for the benefit of, and enforceable against
     the Seller, ICI and each member of the Seller's Group by, the Employees and
     each member of the Purchaser's Group in connection with the sale of the
     Assets and the Business, this agreement and any document ancillary to it
     and any information supplied or omitted to be supplied by them and any act
     or omission by them or any of them in connection with the preparation of
     and the contents of this agreement and any document ancillary to it
     (including, without limitation, the Disclosure Letter) except that this
     clause shall not result in the Seller, ICI or any member of the Seller's
     Group waiving claims for  wilful default or fraud by the Employees.

(17) The Purchaser shall not be deemed to have any specific knowledge except as
     specifically disclosed in the Disclosure Letter.

(18) The provisions of this clause shall have effect notwithstanding any other
     provisions of this agreement.

(19) Subject to the Terra Individuals not being aware of the Purchaser being
     entitled to bring a Warranty Claim at the date of this agreement or at
     Completion (as provided for in (2)(d) above), the Purchaser shall be
     entitled to claim after Completion that any of the Warranties is or was
     untrue or has or had been breached even if the Purchaser knew or could have
     discovered on or before Completion that the Warranty in question was untrue
     or had been breached and Completion shall not in any way constitute a
     waiver of any of the Purchaser's rights in respect of any such claim
     (provided that subclause (2)(d) shall take precedence over the provisions
     of this subclause (19)).

12.  ENVIRONMENTAL

     The Seller and the Purchaser shall observe and perform the provisions of
     Schedule 11 expressed to be observed and performed by each of them
     respectively.

13.  COMPLETION

(1)  Completion shall take place on the later of 31st December, 1997 and the
     tenth Business Day following the satisfaction or, with the agreement of all
     the parties, waiver of the conditions precedent set out in clause 5 (other
     than conditions with respect to actions the respective parties will take at
     Completion itself) or such other date as the parties hereto may mutually
     determine (the "Completion Date").

(2)  Completion shall take place at the offices of the Seller's Solicitors on
     the Completion Date, at which time:

     (a)  each party shall provide to the other evidence in a form reasonably
          satisfactory to the other that it (and each Affiliate entering into an
          Implementation Agreement) has all 
<PAGE>
 
          necessary corporate approvals and its signatories have the necessary
          authority to enter into this agreement and the other agreements
          referred to herein;

     (b)  the Seller shall execute and deliver to the Purchaser the Property
          Documents in the Agreed Form;

     (c)  the Seller shall execute and deliver the Completion Certificate as
          described in clause 5(11);

     (d)  each party shall (or shall procure that its relevant Affiliates) duly
          execute, deliver and, to the extent applicable, complete the
          Implementation Agreements;

     (e)  the Purchaser shall pay to the Seller the sum of (Pounds)200,000,000
          in respect of the Consideration by telegraphic transfer to such
          account as the Seller may specify;

     (f)  the Seller shall let the Purchaser into possession of the Assets and
          occupation of the Properties;

     (g)  the Seller shall make available at the Properties the Records and
          other documents relating exclusively to the operation of the Business
          (the "Business Records") to the Purchaser (but delivery at the place
          where the Records are currently kept shall be a sufficient discharge
          of this obligation provided that such place is included with the
          Properties);

     (h)  the Seller shall execute and deliver the Disclosure Letter (as amended
          pursuant to clause 5) which the Purchaser shall acknowledge and return
          the duly executed copy;

     (i)  the Seller shall deliver the Intellectual Property Consent;

     (j)  the Seller or the relevant member of the Seller's Group shall, in
          respect of the Business Intellectual Property, execute and deliver to
          the Purchaser the Intellectual Property Assignment in the Agreed Form;
          and

     (k)  the parties shall procure the execution and delivery by their
          respective Affiliates of the Ammonium Nitrate Hedging Agreement, the
          Put Agreement and the related Guarantee (the "Hedging Agreements")
          each in the Agreed Form and, if the Seller so requires, corporate
          resolutions, approvals and legal opinions in a form satisfactory to
          the Seller in respect of the Hedging Agreements.

14.  RECORDS, ASSISTANCE AND ACCOUNTS

(1)  The Purchaser shall retain all the Business Records (including, without
     limitation, those documents pertaining to research, development and testing
     of products, sales, marketing and regulatory compliance of products) for a
     period of at least six years following the Completion Date and during that
     period shall allow the Seller and its advisers to inspect and (at the
     Seller's expense) to copy the same at reasonable times on reasonable notice
     for reasonable purposes.  For a period of six years following the expiry of
     that period the Purchaser shall not dispose of or destroy any of the
     Business Records without first giving the Seller at least six months'
     notice of its intention to do so and giving the Seller the opportunity to
     remove and retain any of them (at the Seller's expense).
<PAGE>
 
(2)  Prior to any disposal of the Business by the Purchaser or any member of the
     Purchaser's Group (whether or not the disposal is part of some larger
     transaction and whether or not it forms part of a sale of shares or assets)
     during the twelve year period following Completion, the Purchaser shall
     give written notice of such sale to the Seller in sufficient time for the
     Seller to pursue its rights to inspect, copy, remove or retain
     documentation pursuant to this clause 14.

(3)  For a period of at least six years following the Completion Date, the
     Seller shall retain all the records relating to the Business owned by and
     in the possession of the Seller other than the Business Records or (at the
     Seller's option) shall retain extracts from the same.  During that period,
     the Purchaser shall be entitled to inspect the same and, in so far as they
     relate to the Business, the Purchaser shall be entitled (at the Purchaser's
     cost) to copy such extracts at reasonable times on reasonable notice.  For
     a period of six years following the expiry of that period the Seller shall
     not dispose of or destroy any of such records without first giving the
     Purchaser at least six months' notice of its intention to do so and giving
     the Purchaser the opportunity to remove and retain any of them (at the
     Purchaser's expense). Following the expiry of that further period the
     Seller shall be at liberty to destroy any of such records or extracts.

(4)  The Purchaser shall, at the Seller's expense and on reasonable notice from
     the Seller for reasonable purposes, give such assistance to the Seller as
     the Seller may reasonably require in relation to completing accounts of the
     Seller for the year ending 31st December, 1997 or any proceedings by or
     against the Seller or any of its Affiliates (other than proceedings
     involving the Purchaser or its Affiliates), including, without limitation,
     proceedings relating to employees' claims, product liability or taxation.
     Such assistance shall include, without limitation, access to personnel and
     records of the Purchaser after Completion and access to the Properties
     (insofar as the Purchaser or its Affiliates can grant such access) except
     to the extent that access relates to litigation between the Seller and the
     Purchaser.

(5)  The Seller shall as soon as reasonably practicable and in any event within
     60 days after the Completion Date provide to the Purchaser copies of the
     Accounts for the year ended 31st December, 1997.

15.  DEFUNCT PLANT

(1)  The Seller shall at its expense remove the following plant (the "Defunct
     Plant") within the periods stated:

     (a)  the 1A ammonia plant at Severnside within 42 months of Completion;

     (b)  the LP1 plant at Billingham within 42 months of Completion;

     (c)  the LP2 plant at Billingham within 42 months of Completion; and

     (d)  the LP3 ammonia plant at Billingham within 42 months of Completion.

(2)  The removal of the Defunct Plant shall be conducted in accordance with the
     terms of the letter dated 13th November, 1997 (LP Ammonia Arrangements) and
     an internal ICI e-mail dated 15th November, 1997 which are attached as
     annex 9 to the Disclosure Letter.
<PAGE>
 
(3)  In removing the Defunct Plant the Seller shall ensure that there is no
     breach of Environmental Law, that no contamination is created and that the
     area from which the Defunct Plant has been removed is in a safe condition.

(4)  The Seller further undertakes to ensure that the removal is carried out in
     such a way so as not to interfere to any material degree with the normal
     running of the Business or damage to the Business.

(5)  The Seller shall be liable for all loss or liability caused to the
     Purchaser as a result of the breach by the Seller of its obligations under
     this clause.

16.  EMPLOYEES

     The Seller and the Purchaser shall observe and perform the provisions of
     Schedule 8 expressed to be observed and performed by each of them
     respectively.

17.  PENSIONS

     The Seller and the Purchaser shall observe and perform the provisions of
     Schedule 9 expressed to be observed and performed by each of them
     respectively.

18.  GUARANTEES

(1)  Each of ICI and Terra (the "Guarantor") as primary obligor unconditionally
     and irrevocably:

     (a)  guarantees by way of continuing guarantee to the other and its
          Affiliates (the "Beneficiary") the payment when due of all amounts
          payable by it and its Affiliate which is party to this agreement (the
          "Obligor") to the Beneficiary under this agreement;

     (b)  undertakes to ensure that the Obligor will perform when due all its
          obligations under this agreement;

     (c)  agrees to indemnify and keep indemnified the Beneficiary against all
          losses and damages sustained by it flowing from any non-payment or
          default of any kind by the Obligor under this agreement; and

     (d)  agrees that if and each time that the Obligor fails to make any
          payment to the Beneficiary when it is due under this agreement, the
          Guarantor shall on demand (without requiring the Beneficiary first to
          take steps against the Obligor or any other person) pay that amount to
          the Beneficiary (and the certificate of the Beneficiary shall in the
          absence of manifest error be conclusive evidence of the Seller's
          failure to make the payment).

(2)  The Guarantor's obligations under this clause shall not be affected by any
     matter or thing which but for this provision might operate to affect or
     prejudice those obligations, including without limitation:
<PAGE>
 
     (a)  any time or indulgence granted to, or composition with, the Obligor or
          any other person;

     (b)  the taking, variation, renewal or release of, or neglect to perfect or
          enforce this agreement or any right, guarantee, remedy or security
          from or against the Obligor or any other person; or

     (c)  any unenforceability or invalidity of any obligation of the Obligor,
          so that this clause shall be construed as if there were no such
          unenforceability or invalidity.

(3)  The Beneficiary may appropriate any sum paid by the Obligor, the Guarantor
     or any other person or recovered or received on account of the obligations
     the subject of this clause as the Beneficiary sees fit, whether or not
     towards those obligations.

(4)  Until all amounts which may be or become payable under this agreement have
     been irrevocably paid in full, the Guarantor shall not as a result of this
     clause or any payment or performance under this clause be subrogated to any
     right or security of the Beneficiary or claim or prove in competition with
     the Beneficiary against the Obligor or any other person or claim any right
     of contribution, set-off or indemnity.

(5)  The Guarantor will not hold any security from the Obligor in respect of
     this guarantee and any such security which is held in breach of this
     provision will be held by the Guarantor in trust for the Beneficiary.

(6)  Subject to subclause (7) below, the Guarantor will reimburse the
     Beneficiary for all legal and other costs (including VAT) incurred by the
     Purchaser in connection with the enforcement of this guarantee.

(7)  The liability of the Guarantor under the Guarantee in this clause shall
     under no circumstances exceed the liability of the Obligor and shall be
     subject to any limitations on liability contained in this agreement
     (including, without limitation, the provisions of clause 11).

19.  PROTECTIVE COVENANTS

(1)  The Seller covenants with the Purchaser that no member of the Seller's
     Group will:

     (a)  for a period of four years from Completion within the Territory carry
          on or be engaged or involved in the Field of Activity (save as the
          owner for investment purposes only of securities traded on a
          recognised stock exchange and not exceeding ten per cent. of the
          securities of that class);

     (b)  without prior approval from the Purchaser, for a period of two years
          from Completion, solicit or endeavour to entice away from the
          Purchaser or its Affiliates any of the Employees whether or not such
          person would commit any breach of his/her contract of employment by
          reason of leaving the service of that member of the Purchaser's Group;

     (c)  disclose to any third party (except as otherwise required by law or
          any competent regulatory body or Stock Exchange) any information of a
          secret or confidential nature in the possession of the Seller's Group
          relating to the Business; or
<PAGE>
 
     (d)  attempt or knowingly assist or procure any person to do any of the
          foregoing things.

(2)  The Purchaser covenants with the Seller that no member of the Purchaser's
     Group will disclose to any third party (except as otherwise required by law
     or any competent regulatory body or Stock Exchange), any Non-Exclusive
     Information of a secret or confidential nature in the possession of the
     Purchaser's Group.

(3)  Each of the restrictions in subclause (1) above shall be enforceable
     independently and its validity shall not be affected if the other is
     invalid.

(4)  The  parties acknowledge that the provisions of this clause are no more
     extensive than are reasonable to protect the Purchaser and the Seller (as
     the case may be).

(5)  Nothing in this clause 19 or in this agreement shall prevent the Seller or
     its Affiliates from:

     (a)  purchasing shares in any company or any business which has an interest
          in the Field of Activity (the ownership of which would otherwise
          contravene subclause (1)) unless more than 20 per cent. of the
          turnover of such company or business in its last accounting year was
          generated by its interest in the Field of Activity; provided, however,
          that if the Seller or its Affiliates acquire any such shares or
          business which it wishes to sell at any time during the period of four
          years from Completion, the Seller or its Affiliates (as applicable)
          will first offer such shares or business to the Purchaser.  If the
          Purchaser does not buy such shares or business within a reasonable
          period of time following such offer and in any event (provided the
          Seller or the Purchaser has not unreasonably delayed) within six
          months of such offer being made, the Seller and its Affiliates may
          sell such shares or business to any third party at not less than the
          price so offered and declined;

     (b)  carrying on or being engaged, involved or having any interest in:

          (i)    any business it currently carries on (other than the Business)
                 substantially as conducted in the previous 12 months;

          (ii)   any business after such time as the Purchaser or its Affiliates
                 have ceased to carry on or be engaged or involved in such
                 business;

          (iii)  shares of Irish Fertilizer Industries Limited (or its
                 successor) and the business carried on by that company;

          (iv)   sales of ammonium nitrate by the ICI explosives business
                 provided that such sales are not knowingly made by the Seller's
                 Group for use in fertilizers in the Territory; or

          (v)    nitric acid as an intermediate for industrial use by the
                 Seller's Group or a joint venture to which a member of the
                 Seller's Group is a party;

     (c)  being involved in the Field of Activity only insofar as it relates to
          process licensing, technical assistance or the manufacture, sale or
          lease of catalysts, absorbents and adsorbents to any person which is
          itself involved in the Field of Activity.
<PAGE>
 
(6)  Each of the parties to this agreement confirms that if by virtue of any
     provision of this agreement or of any other agreement or arrangement of
     which this agreement forms part any such agreement or arrangement is
     subject to registration under the Restrictive Trade Practices Act 1976 (the
     "RTPA") none of the parties to any such agreement or arrangement who
     carries on business within the United Kingdom shall give effect to, or
     enforce or purport to enforce the agreement or arrangement in respect of
     any such provision until the day after particulars of the agreement or
     arrangement have been furnished to the Director General of Fair Trading
     under section 24 of the RTPA.

20.  ICI ROUNDEL

(1)  Nothing contained in this agreement shall entitle the Purchaser to any
     rights to carry on business in the names of ICI or of the Seller, or
     otherwise to use  any trademark, service mark, trade name or logo
     (including but not limited to the ICI trade mark known as the ICI Roundel)
     or to use any name, mark or logo confusingly similar thereto, other than
     those comprised in the Business Intellectual Property and the Licensed
     Intellectual Property subject to the terms and conditions of this
     agreement.

(2)  To the extent that any such name or trademark is displayed on any Asset or
     is displayed on any sign or otherwise at the Properties the Purchaser shall
     delete or cover the same as soon as practicable after Completion.

(3)  To the extent that any such name or trademark appears on any Stock, the
     Purchaser shall delete or cover the same before such Stock is sold, passed
     to or otherwise disclosed to any third party, except where it is displayed
     on packaging or labelling materials which are included in the Stock and
     used for the packaging or labelling of products passed to customers of the
     Business within the period of six months from the Completion Date or if
     such supplies existing at Completion are unused at the expiry of six months
     from the Completion Date, at the earlier of the date on which such supplies
     are used or 12 months from the Completion Date.

(4)  The Purchaser shall indemnify the Seller (for itself and on behalf of its
     Affiliates) against all costs, claims, demands and liabilities which result
     from a breach by the Purchaser or any of its Affiliates of the provisions
     of this clause.

21.  CONFIDENTIALITY

(1)  For the purposes of this clause:

     (a)  "Confidential Information" means all information received by the
          Purchaser's Group from the Seller's Group relating to the Seller, its
          Affiliates and the businesses conducted by the Seller's Group (whether
          pursuant to, or in relation to, this agreement or any of the
          Implementation Agreements) and all information received by the
          Seller's Group from the Purchaser's Group relating to the Purchaser,
          its Affiliates and the businesses conducted by the Purchaser's Group
          (whether pursuant to, or in relation to, this agreement or any of the
          Implementation Agreements), including not only written information but
          information transferred orally, visually, electronically, or by any
          other means.  For the avoidance of doubt, the term Confidential
          Information shall not include:
<PAGE>
 
          (i)    information that is in the public domain at the date of this
                 agreement;

          (ii)   information that subsequently comes into the public domain,
                 otherwise than as a result of a breach of this agreement, but
                 only after it has come into the public domain;

          (iii)  information which the receiving party or its Representatives
                 obtain from a third party not under any confidentiality
                 obligation to the disclosing party respecting such information;

          (iv)   information which the receiving party or its Representatives at
                 the time of disclosure already has in its possession and which
                 is not subject to any obligation of secrecy on its part to the
                 other party; or

          (v)    information which is independently developed by employees of
                 the receiving party or its Representatives who had no access to
                 the information disclosed by the disclosing party.

     (b)  "Representatives" means Affiliates, directors, officers, employees,
          agents or representatives of either party or its Affiliates and also
          the funders of any member of the Purchaser's Group in connection with
          the funding of the acquisition under this agreement at Completion or
          any refinancing thereof, and their respective solicitors, accountants,
          consultants and financial or other advisers (provided that any
          entities or persons are subject to an obligation or duty of
          confidentiality).

(2)  Each party undertakes, for a period of 10 years from the date of this
     agreement (subject to such other period specified in an Implementation
     Agreement in relation to particular information), to maintain Confidential
     Information received by it or its Representatives relating to the other
     party or the other party's Affiliates (or their respective businesses) in
     confidence and not disclose that Confidential Information to any person
     other than its Representatives except with the prior written approval of
     the other party.

(3)  Each party undertakes only to disclose to Representatives such Confidential
     Information relating to the other party or the other party's Affiliates as
     is reasonably required for the purposes of performing the obligations under
     this agreement and the Implementation Agreements and only to
     Representatives whom it has informed of the confidential nature of the
     Confidential Information and who undertake to keep it confidential.  Each
     party shall be responsible for breach of such confidentiality undertaking
     by it or its Representatives and undertakes to indemnify and hold harmless
     the other party, its Affiliates or any successor to such business against
     all actions, proceedings, costs, claims, demands, liabilities, losses or
     expenses (including legal expenses) arising from such breach.

(4)  In the event that, after receipt of Confidential Information, either party,
     or any person or Representative to whom it has transmitted Confidential
     Information, becomes legally required (by oral questions, interrogatories,
     requests for information or documents, subpoena, civil investigation,
     demand or similar process, or otherwise) to disclose any of the
     Confidential Information received, the legally compelled party shall
     provide the other party with prompt written notice of that requirement so
     that the other party may seek a protective order or other appropriate
     remedy but shall not be obliged to delay disclosure if to do so 
<PAGE>
 
     would be in breach of any conditions for such disclosure imposed by the
     authority compelling disclosure and in any event should the other party not
     be successful in seeking or obtaining a protective order or other
     appropriate remedy, the other party shall waive compliance with the
     provisions of this agreement for such particular case to enable the legally
     compelled party or its Representative to comply with any such legal
     requirement.

(5)  Each party will only use (or permit the use by its Representatives of) the
     Confidential Information received by it or its Representatives for the
     purposes of the transactions contemplated by this agreement.

(6)  Notwithstanding any provision to the contrary, the provisions of this
     clause shall survive termination of this agreement.

22.  INDEPENDENT ACCOUNTANT

(1)  Where this agreement expressly so provides or if either party wishes to
     refer any matter in dispute in accordance with the provisions of Schedule
     10 for determination under this clause  22 it shall give notice to the
     other requiring the appointment of an independent accounting firm of
     international reputation (the "Independent Accountant").  If the parties
     are unable to agree upon the Independent Accountant within 14 days of such
     notice, then the Independent Accountant shall be appointed by the President
     for the time being of the Institute of Chartered Accountants in England and
     Wales on the application of either party.

(2)  If the Independent Accountant delays or becomes unwilling or incapable of
     acting or if for any other reason the President for the time being of the
     Institute of Chartered Accountants in England and Wales thinks fit he may
     discharge the Independent Accountant and, in the absence of agreement
     between the parties, appoint another in his place.

(3)  The Independent Accountant shall act as an expert and not as an arbitrator
     and his decision shall (in the absence of manifest error or material
     departure from instructions) be final and binding on the parties.  The
     Independent Accountant shall afford the parties the opportunity of making
     written representations to him.

(4)  The fees and expenses of the Independent Accountant shall be borne by the
     parties in equal shares unless the Independent Accountant otherwise
     determines or as otherwise stated in this agreement.

23.  ANNOUNCEMENTS

     Neither party shall make or permit any member of the Seller's Group or the
     Purchaser's Group, as the case may be, to make any announcement concerning
     this agreement, the fact or status of the transaction to which this
     agreement relates or any ancillary matter except as required by law or any
     competent regulatory body or with the prior written approval of the other
     party, the Seller or ICI such approval not to be unreasonably withheld or
     delayed.

24.  VALUE ADDED TAX AND CAPITAL ALLOWANCES

(1)  All amounts expressed in this agreement as being payable by the Purchaser
     are expressed exclusive of any Value Added Tax which may be chargeable on
     any supply for which such amounts form the consideration and the amount of
     any such Value Added Tax shall be payable in addition thereto subject as
     hereinafter provided.
<PAGE>
 
(2)  The Seller, ICI and the Purchaser intend that article 5 of the Value Added
     Tax (Special Provisions) Order 1995 ("article 5") shall apply to the sale
     of the Assets under, or procured under, this agreement, so that the sale is
     treated as neither a supply of goods nor a supply of services.

(3)  If nevertheless any VAT is payable on any supply by the Seller or ICI under
     this agreement or any supply procured pursuant to this agreement, the
     Purchaser shall pay the Seller or ICI the amount of that VAT in addition to
     the price and the Seller, or, as the case may be, ICI shall issue (or
     procure the issue) to the Purchaser a proper VAT invoice in respect of that
     VAT, but any such payments shall be without prejudice to the rights of the
     Purchaser under clause 24(4).

(4)  If any VAT is payable as mentioned in subclause (3) above and such VAT
     would not have been payable:

     (a)  had the Purchaser complied with its obligations under subclause (6)(a)
          or continued to use the Assets as mentioned in subclause (6)(b); or

     (b)  had any matter or circumstance notified in writing by the Purchaser to
          the Seller or ICI (as the case may be) in relation to the application
          by the Seller or ICI (as the case may be) to Customs for a ruling as
          to the application of article 5 to the sale of the Assets under this
          Agreement been correct,

     then

     (aa) such VAT shall be payable by the Purchaser to the Seller or ICI (as
          the case may be) on the later of (i) five working days before the
          Seller or ICI (as the case may be) is obliged to account to Customs
          for such VAT and (ii) five working days after the Seller or ICI (as
          the case may be) gives the Purchaser written notice that such VAT is
          payable and of the amount of such VAT; and

     (bb) the Purchaser shall indemnify the Seller or ICI (as the case may be)
          against any interest or penalties imposed by Customs arising out of
          the treatment by the Seller, ICI and the Purchaser of the sale as
          described in subclause (2) above except to the extent that any such
          interest or penalties are referable to any period after the Seller or
          ICI (as the case may be) has received cleared funds equal to such VAT
          from the Purchaser.

     In all other circumstances the Purchaser shall pay such VAT to the Seller
     or ICI (as the case may be) within five working days of recovery of such
     VAT by the Purchaser (or by the representative member of any VAT group of
     which the Purchaser is a member) pursuant to sections 25 or 26 of the Value
     Added Tax Act 1994 (and the Purchaser shall use reasonable endeavours to
     procure such recovery as soon as lawfully possible) provided that if such
     VAT has not been so recovered in full on the expiration of three months
     after Completion the Purchaser shall be deemed for the purposes of this
     sub-clause to have recovered such VAT in full on that date.
<PAGE>
 
(5)  If the Purchaser fails to pay the amount of the tax on the due date under
     subclause (3), it shall pay Default Interest on that amount from the due
     date until actual payment (excluding any period for which interest
     indemnified under subclause (2) runs) compounded monthly.

(6)  With a view to procuring that article 5 applies, the Purchaser:

     (a)  shall ensure that the Purchaser is registered for VAT not later than
          the date of Completion; and

     (b)  warrants that the Assets are to be used by the Purchaser in carrying
          on the same kind of business as that carried on by the Seller and ICI.

(7)  The Seller and the Purchaser envisage that section 49 of the Value Added
     Tax Act 1994 will apply to the sale and purchase of the Assets under this
     agreement but intend that the Seller should retain the records referred to
     in that section, and accordingly:

     (a)  notwithstanding anything in this agreement the Seller shall not be
          required to deliver to the Purchaser the records referred to in
          section 49;

     (b)  the Seller shall make a request to Customs under section 49 for the
          records to be preserved by the Seller;

     (c)  if or for so long as that request is not granted, the Seller shall
          preserve the records on behalf of the Purchaser for such period as may
          be required by law, and shall during that period permit the Purchaser
          reasonable access to them to inspect or make copies of them; and

     (d)  the Seller may fulfil its obligations under paragraph (c) by procuring
          that a future transferee of its business or any other person preserves
          the records and permits reasonable access as mentioned in that
          paragraph, in which case the Seller shall notify the Purchaser of the
          name of that person to the contrary in this agreement.

(8)  The Seller shall if so requested by the Purchaser and at the Purchaser's
     expense supply the Purchaser with all information which is in the Seller's
     possession and which is reasonably necessary to enable the Purchaser to
     claim any capital allowances which may be available to the Purchaser in
     respect of any Asset, fixture, property or any other item or asset of any
     description being acquired by the Purchaser.

25.  COMPUTER SYSTEMS

(1)  To the extent that defined terms are used in this clause 25 they shall bear
     the meaning given to them in this agreement but in the absence of any
     definition they shall bear the meaning given to them in the Shared IT
     Services Agreement.

(2)  On condition that the Purchaser and ICI enter into the Shared IT Services
     Agreement on or before the Completion Date, each of the Seller and ICI
     shall use its reasonable endeavours to ensure that the Purchaser will for a
     period of 18 months from and including Completion be able to use and/or
     obtain the benefit of the Computer Systems necessary for the conduct of the
     Business as the Business was carried on by the Seller during the Comparison
     Period.
<PAGE>
 
26.  DEFAULT INTEREST

     Subject as otherwise provided to the contrary in this agreement, if any sum
     due for payment under or in accordance with this agreement is not paid on
     the due date the party in default shall pay Default Interest on that sum
     from the due date until the date of actual payment calculated on a day to
     day basis.

27.  NOTICES

(1)  Any notice or other document to be served under this agreement shall be in
     writing and may be delivered by hand or sent by post or overnight courier
     service to the party to be served at its address appearing in this
     agreement (and marked for the attention of the person whose name is
     referred to in subclause (3) below) or at such other address (or marked for
     the attention of such other person) as it may have notified to the other
     party in accordance with this clause.  Any notice or other document sent by
     post shall be sent by registered post (if both posted and for delivery
     within the same jurisdiction) or by registered airmail (if posted for
     delivery outside the jurisdiction in which it is posted).

(2)  Any notice or document shall be deemed to have been served:

     (a)  if delivered by hand, at the time of delivery; or

     (b)  if posted or if sent by overnight courier service, at 10.00 a.m. on
          the second Business Day after it was sent for delivery within the same
          jurisdiction, or at 10.00 a.m. (local time at the place of
          destination) on the fifth Business Day after it was put in the post if
          sent by registered airmail.

(3)  The person to whom notices or documents should be addressed for the
     purposes of subclause (1) is:

     (a)  if to be served on the Seller or  ICI:
          the Company Secretary;

     (b)  if to be served on the Purchaser or Terra:
          Mr G.M. Valentine.

(4)  In proving service of a notice or document it shall be sufficient to prove
     that delivery was made by hand or that the envelope containing the notice
     or document was properly addressed and provided to the overnight courier or
     posted (either by registered post or by registered airmail, as the case may
     be, in accordance with the requirements of this clause).

28.  GENERAL

(1)  Each of the obligations, warranties and undertakings set out in this
     agreement which is not fully performed at Completion will continue in force
     after Completion.

(2)  Unless otherwise expressly stated all payments to be made under this
     agreement shall be made in Pounds Sterling to the Seller in immediately
     available funds to the account of the 
<PAGE>
 
     Seller at such account as the Seller may notify to the Purchaser and to the
     Purchaser in immediately available funds to such account as the Purchaser
     may notify to the Seller.

(3)  Save as otherwise provided to the contrary in this agreement, each payment
     to be made under this agreement shall be made free and clear of all
     deductions or withholdings of any kind, except for those required by law,
     and if any deduction or withholding must be made by law, an additional
     amount will be paid sufficient to ensure that the recipient receives a net
     amount equal to the full amount which it would have received if the payment
     had been made without the deduction or withholding.  If and when the
     recipient of the payment (the "recipient") obtains a relief or refund
     attributable to the deduction or withholding, it will pay to the maker of
     the payment (the "payer") an amount equal to the relief or refund, less:

     (a)  any external costs of the recipient in obtaining the relief or refund
          and in paying the said amount to the payer;

     (b)  any additional Taxation liability of the recipient arising on such
          relief or refund; and

     (c)  any deduction or withholding required by law on such payment of such
          amount by the recipient to the payer.

(4)  None of the rights or obligations under this agreement may be assigned or
     transferred without the written consent of the other party provided,
     however, that either party may:

     (a)  assign any or all of its rights and interests hereunder to one or more
          of its Affiliates provided that:

          (i)   such assignment shall only be permitted if the assignment has no
                adverse effect on the non-assigning party;

          (ii)  if the Affiliate to which the rights have been assigned ceases
                to be an Affiliate of the assigning party, the rights which have
                been transferred shall, prior to it ceasing to be an Affiliate,
                be re-transferred to the party which originally assigned those
                rights or to another Affiliate of that original assigning party;
                and

          (iii) it shall be a condition of any such assignment that reasonable
                notice is given in writing to the other party of the proposal to
                assign (identifying the rights proposed to be assigned, the
                identity of the proposed assignee and such other details
                relating thereto as the other party may reasonably require);

     (b)  designate one or more of its Affiliates to perform its obligations
          under this agreement (in any or all of which cases the Seller or the
          Purchaser, as the case may be, nonetheless shall remain responsible
          for the performance of all of its obligations hereunder); or

     (c)  (in respect of the Purchaser only) assign its rights and interests
          under this agreement for the benefit of the funders of any member of
          the Purchaser's Group in connection with the funding of the
          acquisition under this agreement at Completion or any refinancing
          thereof.
<PAGE>
 
(5)  Save as otherwise provided in this agreement, each party shall pay the
     costs and expenses incurred by it in connection with the entering into and
     completion of this agreement.

(6)  This agreement may be executed in any number of counterparts, all of which
     taken together shall constitute one and the same agreement and any party
     may enter into this agreement by executing a counterpart.

(7)  No amendment, variation or waiver of this agreement or any provision of
     this agreement shall be effective unless it is in writing and duly executed
     by or on behalf of each of the parties.

(8)  Both parties shall and shall procure that their Affiliates shall at their
     own expense at all times from the date of this agreement do all things as
     may be reasonably required to give effect to this agreement including,
     without limitation, the execution of all deeds and documents, procuring the
     convening of all meetings, the giving and obtaining of all necessary
     waivers and consents and the passing of all resolutions and otherwise
     exercising all powers and rights available to them.  For the avoidance of
     doubt, the Seller shall be responsible for all costs that have been or may
     be incurred as a result of any assignment of Business Intellectual Property
     executed between members of the Seller's Group prior to Completion
     including the costs of recording of such assignment.

(9)  The Purchaser hereby waives and relinquishes any right of set-off or
     counterclaim, deduction or retention which the Purchaser might otherwise
     have in respect of sums due to the Seller under the Hedging Agreements.

(10) Each of the parties hereto acknowledges and agrees that the other parties
     would be damaged irreparably in the event any of the provisions of this
     agreement are not performed in accordance with their specific terms or
     otherwise are breached.  Accordingly, each of the parties hereto agrees
     that the other parties shall be entitled to an injunction or injunctions to
     prevent breaches of the provisions of this agreement and to enforce
     specifically this agreement and the terms and provisions of this agreement
     in addition to any other remedy to which it may be entitled, at law or in
     equity.

(11) The Seller's Group will, prior to the Completion Date, permit
     representatives of the Purchaser to have reasonable access at all
     reasonable times and on reasonable notice, and in a manner which, in the
     reasonable opinion of the Seller, will not unduly interfere with the normal
     business operations of the Seller or any member of the Seller's Group, to
     all premises, properties, personnel, books, records (including tax
     records), contracts, and documents of or pertaining to the Business,
     subject to appropriate undertakings of confidentiality and subject to
     obligations of confidentiality to third parties.

29.  WHOLE AGREEMENT

(1)  Subject to subclause (2) below, this agreement, the Implementation
     Agreements and the other agreements to be entered into pursuant to this
     agreement (if and when executed) contain the whole agreement between the
     parties and their respective Affiliates relating to the transactions
     contemplated by this agreement and the Implementation Agreements and
     supersede all previous agreements (including the Data Room Rules dated 19th
     August, 1997) between the parties and their respective Affiliates relating
     to such transactions.
<PAGE>
 
(2)  A provision in another agreement between the parties to this agreement or
     between the respective parent undertakings of the parties (and whether made
     before or after the date of this agreement) which refers to this agreement
     and which extends or supplements any provision in this agreement will be
     deemed for the purposes of subclause (1) above to form part of the whole
     agreement between the parties as referred to in that subclause.

(3)  Each of the parties to this agreement acknowledges on its own behalf and on
     behalf of each of its Affiliates that, in agreeing to enter into this
     agreement and the Implementation Agreements, it has not relied on any
     representation, warranty, collateral contract or other assurance (except
     those set out in this agreement and the Implementation Agreements) and
     waives all rights and remedies which, but for this subclause, might
     otherwise be available to it in respect of any such representation,
     warranty, collateral contract or other assurance, provided that nothing in
     this subclause shall limit or exclude any liability for fraud.

30.  GOVERNING LAW

     This agreement is governed by and shall be construed in accordance with
     English law.

31.  JURISDICTION

     The parties submit to the non-exclusive jurisdiction of the English courts
     for all purposes relating to this agreement.  Terra irrevocably appoints
     the Purchaser as its agent for service of process.

AS WITNESS the hands of the duly authorised representatives of the parties on
the date which first appears on page 1.
<PAGE>
 
                                  SCHEDULE 1
                                  See Annex 2
<PAGE>
 
                                  SCHEDULE 2

                              PLANT AND EQUIPMENT
                                        
                                  BILLINGHAM
                       Ammonia 4 Production Plant (NH3)
                     Ammonia Storage Facilities (NH3 Sto)
                Sphere and loading facilities for Road Tankers
              Dilution plant and storage and Road Tanker Loading
                      Nitric Acid Plants, Nos 1,8,3 and 4
                        Ammonium Nitrate Prilling Tower
                             Sodium Nitrate Plant
  Storage facilities for finished product fertilizer, nitric acid and sodium
                                    nitrate
         CO\\2\\ liquefaction plants (Nos 2 and 3) and storage bullets
Pipe bridges with pipes and cables; buried pipelines; auxiliary boilers and; de-
                            mineralised water plant



                                  SEVERNSIDE

                      Two leading concept ammonia plants
                            Two nitric acid plants
                      One ammonium nitrate prilling tower
                    Storage for finished product fertilizer
                          CO\\2\\ liquefaction plant
                           Utilities infrastructure



                                    STANLOW
                                        
                    CO\\2\\ liquefaction plant and storage
<PAGE>
 
                                  SCHEDULE 3

                INTELLECTUAL PROPERTY AND EXCLUDED TECHNOLOGIES


                    Part 1:  Business Intellectual Property
                                        
                            Registered Trade Marks

                     See annex 6 of the Disclosure Letter

                           Unregistered Trade Marks

                                    Classic
                                 Classic Gold
                                   Number 8
                                    Super 8
                                 Sulphur Gold
                                   Blue Bag


                    Part :  Licensed Intellectual Property

                                    Designs

                                    1054749
                                    1054750

                                    Patents

                                EP 0080839 (UK)
                                EP 0320153 (UK)

                 Copyright relating to the following Software:

                                      QSA

   Modifications to SAP/R2 order processing system dedicated to the Business
Developments as at Completion of Modifications to SAP/R3 order processing system
                           dedicated to the Business
<PAGE>
 
                        Part 3:  Excluded Technologies

                                    Patents

                                EP 0080270 (UK)
                                EP 0124228 (UK)
                                EP 0157480 (UK)
                                EP 0180412 (UK)
                                EP 0194067 (UK)
                                EP 0254395 (UK)
                                EP 0287238 (UK)

                        Part 4:  Exclusive Information

           Information relating to the manufacture of Sodium Nitrite
         Information relating to the abatement of NOx from Nitric Acid
                        Manufacture using caustic soda
<PAGE>
 
                                  SCHEDULE 4


                                    Part 1

                                ICI Individuals
                                        
                                 R.W. Carter
                                 G.M. Fish
                                 M. Gardner
                                 S.A. Roberts
                                 T.A. Shovlin
                                 A.J. Lewis
                                 C. Lock
                                 P. Gill
                                 M.J. Welch
                                 D.S. Flett
                                 J. Hullah
                                 R.C. Goodwin
                                 M. Bell
                                 J. Lees
                                 C.A. Hobson
                                 S.J. Beer
                                 J. Robertson
                                 M. White

                                    Part 2

                               Terra Individuals
                                 M.L. Bennett  
                                 G.H. Valentine
                                 L.S. Hlobek
                                 E.L. Slockers
                                 S. Savage
<PAGE>
 
                                  SCHEDULE 5

                                EXCLUDED ASSETS

1.   All assets required by the Seller or its Affiliates for the supply or
     receipt of utilities, services or products to be supplied by the Seller or
     its Affiliates to the Purchaser or its Affiliates pursuant to the
     Implementation Agreements which are located either outside the Properties
     and are not subject to the Property Rights or identified in the
     Implementation Agreements as being retained by the Seller or its
     Affiliates.

2.   Any interest in the Wilton site except as set out in the Implementation
     Agreements or the Property Documents and/or Premises Agreements.
<PAGE>
 
                                  SCHEDULE 6
                                        
                           IMPLEMENTATION AGREEMENTS
                                        
                                        
<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------
          AGREEMENT                       SUPPLIER                    PURCHASER
- -------------------------------------------------------------------------------------
<S>                                     <C>                          <C>
        1.  UTILITIES                   The Business                   Methanol
           Nitrogen
        Potable Water
    Fire Water (Raw Water)
         Gately Water
         Demin Water
           Effluent
           IP Steam
           LP Steam
- -------------------------------------------------------------------------------------
       2.  ELECTRICITY                  The Business                   Methanol
          50Hz Elec
- -------------------------------------------------------------------------------------
        3.  MATERIALS                   The Business                   Methanol
        Carbon Dioxide
- -------------------------------------------------------------------------------------
         4.  SERVICES                   The Business                   Methanol
       Site Road System
        Interface Ops
        Process Pipes
- -------------------------------------------------------------------------------------
        5.  UTILITIES                   The Business                    Amines
         Gately Water
          Fire Water
        Potable Water
           Effluent
           HP Steam
           IP Steam
           LP Steam
          Condensate
    Nitrogen (by pipeline)
- -------------------------------------------------------------------------------------
       6.  ELECTRICITY                  The Business                    Amines
          Elec 40Hz
          Elec 50Hz
- -------------------------------------------------------------------------------------
</TABLE>
<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------
            AGREEMENT                       SUPPLIER                      PURCHASER
- ----------------------------------------------------------------------------------------
<S>                                       <C>                           <C>
         7.  MATERIALS                    The Business                      Amines
            Ammonia                       
- ----------------------------------------------------------------------------------------
         8.  UTILITIES                    The Business                     Acrylics
            LP Steam
          Demin Water
     Raw Water (Fire Water)
    Raw Water (Gately Water)
         Potable Water
     Nitrogen (by pipeline)
            Effluent
 IP Steam (includes supply and
           purchase)
- ----------------------------------------------------------------------------------------
        9.  ELECTRICITY                   The Business                     Acrylics
           50 Hz Elec
- ----------------------------------------------------------------------------------------
         10.  MATERIAL                    The Business                     Acrylics
            Ammonia
- ----------------------------------------------------------------------------------------
         11.  UTILITIES                   The Business                     Katalco
         Potable Water
     Fire Water (Raw Water)
            Effluent
            LP Steam
    Gately Water (Raw Water)
            Nitrogen
- ----------------------------------------------------------------------------------------
        12.  ELECTRICITY                  The Business                     Katalco
       50 Hz Electricity
- ----------------------------------------------------------------------------------------
         13.  MATERIAL                    The Business                     Katalco
        Weak Nitric Acid
- ----------------------------------------------------------------------------------------
         14.  MATERIALS                   The Business                  Polyurethanes
        Weak Nitric Acid
- ----------------------------------------------------------------------------------------
         15.  MATERIALS                   The Business                    Explosives
        Weak Nitric Acid
- ----------------------------------------------------------------------------------------
         16.  UTILITIES                     ICI Tubs                     The Business
           Raw Water
            Nitrogen
            Nitrogen
- ----------------------------------------------------------------------------------------
</TABLE>

<PAGE>
 
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------
              AGREEMENT                        SUPPLIER                    PURCHASER
- -----------------------------------------------------------------------------------------
<S>                                         <C>                          <C>
            17.  SERVICES                   Plymouth Tubs                The Business
          Pay Roll Services
            Jetty Services
- -----------------------------------------------------------------------------------------
            18.  MATERIALS
               Hydrogen
- -----------------------------------------------------------------------------------------
            19.  MATERIALS                     Katalco                   The Business
              Catalysts
- -----------------------------------------------------------------------------------------
            20.  MATERIALS                     Methanol                  The Business
            Instrument Air
               LP Steam
- -----------------------------------------------------------------------------------------
            21.  UTILITIES                     Acrylics                  The Business
    IP Steam (includes supply and
              purchase)
- -----------------------------------------------------------------------------------------
           22.  GAS-SUPPLY                      Seller                     Purchaser
             BGT (No. 1)
- -----------------------------------------------------------------------------------------
           23.  GAS-SUPPLY                      Seller                     Purchaser
             BGT (No. 2)
- -----------------------------------------------------------------------------------------
           24.  GAS-SUPPLY                      Seller                     Purchaser
                Mobil
- -----------------------------------------------------------------------------------------
           25.  GAS-SUPPLY                    Purchaser                    Acrylics

- -----------------------------------------------------------------------------------------
           26.  GAS-SUPPLY                    Purchaser                     Amines

- -----------------------------------------------------------------------------------------
       27.  GAS-TRANSPORTATION                Purchaser                       ---
                Master
- -----------------------------------------------------------------------------------------
       28.  GAS-TRANSPORTATION                Purchaser                    Methanol
               Methanol
- -----------------------------------------------------------------------------------------
      29.  Terra and ICI parent
      guarantees relating to the
              agreements
- -----------------------------------------------------------------------------------------
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------
               AGREEMENT                         SUPPLIER                    PURCHASER
- -------------------------------------------------------------------------------------------
<S>                                             <C>                          <C>
      30.  The Shared IT Services
     Agreement between ICI and the
               Purchaser
- -------------------------------------------------------------------------------------------
      31.  Assignment of Business
         Intellectual Property
- -------------------------------------------------------------------------------------------
        32.  Ammonia facilities
       access agreement (Amines)
- -------------------------------------------------------------------------------------------
    33.  Ammonia facilities access
         agreement (Acrylics)
- -------------------------------------------------------------------------------------------
</TABLE>
<PAGE>
 
                                  SCHEDULE 7
                                        
                                  WARRANTIES

In this Schedule 7 "material adverse effect" means an adverse effect upon the
Business which might reasonably be expected to result in a diminution in the
value of the Business in the hands of the Purchaser following Completion in
excess of (Pounds)100,000.

                                  A.  GENERAL
                                        
A.1  Capacity and conduct of business

(1)  Each of the Seller and ICI (and each of its Affiliates, in respect of the
     Implementation Agreements and the other agreements entered into pursuant to
     this agreement to which it is a party) has the requisite power and
     authority to enter into and to perform this agreement, such Implementation
     Agreements and the other agreements entered into pursuant to this
     agreement.

(2)  Each of the Seller and ICI (and each of its Affiliates, in respect of the
     Implementation Agreements and the other agreements entered into pursuant to
     this agreement to which it is a party) has obtained or satisfied all
     corporate, regulatory and other approvals, or any other significant
     conditions, necessary to execute and perform this agreement, such
     Implementation Agreements and the other agreements entered into pursuant to
     this agreement.

(3)  This agreement, the Implementation Agreements and the other agreements
     entered into pursuant to this agreement constitute (or when executed, will
     constitute) valid and binding obligations of the Seller and ICI (and each
     of its Affiliates, in respect of Implementation Agreements and the other
     agreements entered into pursuant to this agreement to which it is a party)
     enforceable in accordance with their terms.

(4)  Compliance with the terms of this agreement by the Seller and ICI and the
     other agreements entered into pursuant to this agreement and the
     Implementation Agreements by the Seller or its Affiliates (as appropriate)
     will:

     (a)  not constitute a breach of any agreement or contract to which the
          Seller, ICI or such Affiliate is a party or by which it is bound; or

     (b)  be in compliance with the Seller's, ICI's or such Affiliate's
          memorandum and articles of association or other constitutional
          documents; or

     (c)  not contravene any order, judgment, decree or regulation or any other
          restriction of any kind by which the Seller, ICI or such Affiliate is
          bound.

(5)  Each of the Seller and ICI is a company, duly incorporated and subsisting
     under the laws of England and Wales and is not in liquidation,
     administration or administrative receivership, nor has any resolution been
     passed by the shareholders or creditors to put either of the companies into
     liquidation, administration or administrative receivership.
<PAGE>
 
(6)  The Seller does not act or carry on business in partnership with any other
     person in relation to the Business.

(7)  The Seller does not have any branch, agency, place of business or permanent
     establishment outside England and Wales in relation to the Business.

A.2  The assets

(1)  Save in respect of Business Intellectual Property, Exclusive Information
     and those Assets that are leased and are identified as such in the
     Disclosure Letter, the Seller has full legal and beneficial title to each
     of the Assets.

(2)  None of the Assets is subject to any Encumbrance except those which arise
     in the ordinary course of business and do not have a material adverse
     effect on the Business.

(3)  The Assets together with the rights conferred under or pursuant to this
     agreement will enable the Purchaser to continue to run the Business after
     Completion in all material respects  in the same way as it was run by the
     Seller as at 30th September, 1997 and as at the date of this agreement.

(4)  All significant items of plant and equipment used in the Business have been
     adequately maintained and are in reasonable working order having regard to
     their age and use.

A.3  Compliance with statutes

(1)  The Seller, its officers, agents and employees are not in contravention of
     any statute, order or regulation which is likely to result in a fine or
     penalty which would have a material adverse effect on the Business.

(2)  There is no order, decree or judgment or any court or governmental agency
     outstanding in relation to the Business other than in relation to routine
     debt collection.

A.4  Licences, consents and permits

(1)  The Seller has all governmental and regulatory authorisations, licences,
     permits and consents necessary to own and operate the Assets and to carry
     on the Business, except where the failure to obtain such authorisations,
     licences, permits or consents individually or in aggregate would not have a
     material adverse effect on the Business.   For the avoidance of doubt the
     Seller provides no warranty or undertaking that any such authorisations,
     licences, permits or consents will be available to the Purchaser.

(2)  All authorisations, licences, permits and consents of the type referred to
     in (1) have been identified in the Disclosure Letter.

A.5  Litigation

     The Seller's Group is not engaged in any litigation or arbitration
     proceedings which would have a material adverse effect on the Business
     except as plaintiff for collection of debts in the ordinary course of
     business and there are no such proceedings, in existence or, so far as the
     Seller is aware, threatened against the Seller and, so far as the 
<PAGE>
 
     Seller is aware, there are no claims, facts or events which are likely to
     give rise to any such proceedings.

A.6  Environmental matters

(1)  Notwithstanding the provisions of any other Warranty the provisions of this
     paragraph A.6 are the only Warranties given in relation to the Environment,
     Environmental Laws, Environmental Permits and Dangerous Substances.

(2)  In this paragraph:

     (a)  "Environmental Law" has the meaning given in Schedule 11;

     (b)  "Environmental Permits" means any governmental authorisations,
          permits, licences and consents required under or in relation to any
          Environmental Law;

     (c)  "Environmental Contamination" has the meaning given in Schedule 11
          provided that, for the purposes of this warranty A.6 such
          contamination must be present prior to Completion and cause or be
          likely to cause material harm to human health or pollution of the
          environment;

     (d)  "Dangerous Substance" means any natural or artificial substance
          (whether in the form of solid, liquid, gas or vapour) capable of
          causing significant harm to man or the environment.

     (e)  "Material Upgrades" means in relation to any plant or process all
          material changes under current written conditions contained in
          existing Environmental Permits which are required either now or in the
          future including for the avoidance of doubt any upgrades required
          under improvement programmes.

(3)  The Seller, its agents, officers and employees are not in contravention of
     any Environmental Law which is likely to result in a fine or penalty which
     would have a material adverse effect on the Business.

(4)  There is no written notice, order, decree or judgment of any court or
     regulatory or governmental agency of the United Kingdom outstanding, nor
     agreements to which the Seller is a party or by which the Seller is bound,
     in relation to the Business which arises as a result of or, in the case of
     agreements, concern Environmental Law or liabilities thereunder which would
     have a material adverse effect on the Business.

(5)  The Seller has all Environmental Permits necessary to own and operate the
     Assets and to carry on the Business, except where the failure to obtain
     such Environmental Permits individually or in aggregate would not have a
     material adverse affect on the Business.  For the avoidance of doubt, the
     Seller provides no warranty or undertaking that any such Environmental
     Permits will be available to the Purchaser.(6)  A list of all material
     Environmental Permits has been identified in the Disclosure Letter.

(7)  The Seller is not engaged in any  litigation or arbitration proceedings
     concerning Environmental Law or Dangerous Substances solely in relation to
     and affecting the Business and, so far as the Seller is aware, there are no
     such proceedings pending nor any 

<PAGE>
 
     circumstances likely to give rise to such proceedings against the Seller in
     its capacity as owner of the Business, in each case which would have a 
     material adverse effect.

(8)  So far as Seller is aware, there is no Environmental Contamination present
     at any adjoining sites which has led or is likely to lead to on site
     Environmental Contamination at the Billingham and/or Severnside sites.  For
     the purposes of this warranty A.6(8) only, the Seller's awareness shall be
     judged by reference solely to the actual knowledge, without any
     documentary, oral or other investigation enquiry or consultation of any
     kind, of Tony Lewis, John Reynolds, Ron Goodwin in the case of the
     Billingham site and Richard Baker, Graham Foster, Mike Welch in the case of
     the Severnside site.

(9)  A list of all Material Upgrades of which the Seller is aware is provided in
     the Disclosure Letter.

A.7  Title retention

     Other than in the ordinary course of trading, the Seller has not acquired
     or agreed to acquire any of the Assets on terms that the property therein
     does not pass until full payment is made.

A.8  Customers and suppliers

     The Disclosure Letter sets out details of the ten principal customers and
     ten principal suppliers of materials (by value) of the Business.

A.9  Condition of Stock

     All products manufactured by the Seller prior to Completion and included
     within the Stocks conform with the specifications against which those
     products would have been sold by the Seller to customers of the Business if
     the Seller had continued to carry on the Business after Completion as it
     was carried on by the Seller prior to Completion, provided always that the
     Seller's liability for breach of this warranty shall not exceed the costs
     which the Seller would have suffered had the Seller's policy in relation to
     out of specification product which applied prior to Completion, been
     continued following Completion.

                                  B.  ACCOUNTS

(1)  The Accounts have been prepared in accordance with UK generally accepted
     accounting principles and present fairly the financial position of the
     Business as at the end of the periods for which they were prepared and the
     results of operations and changes in financial position and cash flows for
     the period in respect of which they were prepared have been prepared in
     conformity with the ICI Controller's Manual applied on a basis consistent
     with the previous twelve months save for changes made in the ICI
     Controller's Manual to reflect changes in UK accounting practice from time
     to time (save as noted therein).

(2)  Save as noted therein, the Accounts have not been affected by any
     extraordinary, exceptional or non-recurring item or by any other fact or
     circumstance rendering the profit or loss for the relevant period unusually
     high or low.

(3)  Particulars of all grants, subsidies, payments or allowances received or
     receivable by the Seller or any of its Affiliates in relation to the
     Business from any governmental authority, 
<PAGE>
 
     body or agency (whether supranational regional or local) (but always
     excluding any relating to Taxation) the loss of which would have a material
     adverse effect are identified in the Disclosure Letter.

(4)  The amounts of raw materials, work in progress, finished goods and
     packaging and promotional material comprised in the Stock are at a level
     which is consistent with the trading requirements of the Business.

                       C.  ANTI COMPETITIVE ARRANGEMENTS
                                        
(1)  In relation to the Business, the Seller is not a party to any agreement,
     arrangement, concerted practice or course of conduct (whether by omission
     or otherwise) which:

     (a)  is subject to registration under the Restrictive Trade Practices Acts
          1976 but is not so registered;

     (b)  infringes Article 85 or 86 of the Treaty establishing the European
          Community and/or Articles 53 and/or 54 of the European Economic Area
          Agreement or any other anti-trust or similar legislation in any
          jurisdiction in which the Seller carries on the Business;

     (c)  is an "anti-competitive practice" within the meaning of the
          Competition Act 1980;

     (d)  contravenes the provisions of the Resale Prices Act 1976 or an
          undertaking which has been given by, or an order which has been made
          against, the Seller pursuant to that Act;

     (e)  so far as the Seller is aware, could give rise to the imposition of
          any anti-dumping duty on the Seller or the Purchaser or other sanction
          against the Seller or the Purchaser under any EU trade legislation,

     and the effect of which would have a material adverse effect on the
     Business.

(2)  The Seller has not received in the last three years any process, notice or
     communication, formal or informal, from the Office of Fair Trading or
     Directorate General IV of the European Commission or the EFTA Surveillance
     Authority or any relevant local or national anti-trust regulatory
     authority, relating to any aspect of the Business which alleges any illegal
     practices, course of conduct, agreements or arrangements in relation to the
     Business and so far as the Seller is aware no such process, notice or
     communication is likely to be received.

                             D.  MATERIAL CONTRACTS
                                        
(1)  All Material Contracts relating to the Business are referred to in the
     Disclosure Letter.  For the purpose of this warranty "Material Contracts"
     means contracts or commitments to enter into contracts (with third parties
     not within the Seller's Group):

     (a)  of a duration from the date of this agreement of more than 12 months;
<PAGE>
 
     (b)  which are for a duration from the date of this agreement of less than
          12 months but which can reasonably be expected to involve aggregate
          income or expenditure in respect of the Business in excess of
          (Pounds)300,000; or

     (c)  which are agency, distributorship or management agreements.

(2)  So far as the Seller is aware, it is not in breach of, or in default under,
     any of the Material Contracts, the consequence of which would have a
     material adverse effect on the Business.

(3)  The Seller is not a party to any contract or arrangement, other than to the
     extent that they relate to Intellectual Property, which restricts its
     freedom to carry on the Business in any part of the world in such manner as
     it thinks fit.

(4)  Save as set out in the Disclosure Letter there is not, and there has not at
     any time during the last two years been, any contract or arrangement
     between the Seller and a party which was not part of the Seller's Group in
     relation to the Business which was not of an arm's length nature and was
     material to the Business.

(5)  So far as senior management of the Seller is aware (without having made any
     enquiry of third parties), after Completion (whether by reason of an
     existing agreement or arrangement or as a result of the proposed
     acquisition of the Business and Assets by the Purchaser):

     (a)  no supplier of the Business will cease supplying the Business or will
          substantially reduce its supplies to the Business;

     (b)  no customer of the Business will cease to deal with the Business or
          will substantially reduce its existing level of business with the
          Business;

     (c)  the Business will not lose the benefit of any right or privilege which
          it enjoys; and

     (d)  no officer or Employee will leave,

     in each case, which he is aware would have a material adverse effect.

(6)  There will be no material agreements between the Businesses and any member
     of the Seller's Group immediately following Completion (save for the
     Implementation Agreements, any other agreements to be entered into pursuant
     to this agreement and any other arrangements to be entered into pursuant or
     ancillary thereto) which is not in the ordinary course of business or other
     than on an arm's length basis.
                                        
                                 E.  EMPLOYEES
                                        
(1)  The Employees are all the persons employed in the Business.  The Disclosure
     Letter contains details of each Employee's name, age, salary, period of
     continuous employment, grade and any allowances the Employee is entitled to
     and the particulars of the Employees in the Disclosure Letter are accurate
     in all respects.

(2)  No Employee has given, or has been given, notice of termination of his
     employment.

(3)  Specimen terms of employment of all Employees are included in the
     Disclosure Letter.
<PAGE>
 
(4)  The collective agreements included in the Disclosure Letter are all the
     agreements between the Seller and the trade unions representing the
     Employees.

(5)  So far as the Seller is aware, there is no industrial  action pending in
     relation to the Business which would have a material adverse effect on the
     Business.

(6)  Since 30th September, 1997 there has been no change in the rates of
     remuneration or other benefits or other terms of employment of the
     Employees and no person will be entitled to receive any benefit as a direct
     consequence of the Sale of Business.  The Seller is not a party to any
     contractual arrangement to make changes to remuneration or other benefits
     or other terms of employment or to establish any new bonus arrangements for
     the Employees.

(7)  There are no sums owing to any present or former Employees or officers in
     the Business apart from salary for the month in which Completion takes
     place and any business expenses.

(8)  The Seller has not in relation to the Business in the last three years been
     the subject of any adverse report, complaint or investigation of the Health
     and Safety Executive in relation to the Assets or been prosecuted, formally
     cautioned or warned for any violation of any applicable laws or regulations
     including the Health and Safety at Work etc. Act 1974 and the Control of
     Substances Hazardous to Health Regulations 1987.  So far as the Seller is
     aware, the Seller has fully complied with all health and safety statutes
     and regulations in relation to the Business.

(9)  The terms of the Employees are such that their employment may be terminated
     by not less than three months' notice without liability for any contractual
     payments in excess of three months' salary including by way of compensation
     or damages (except for unfair dismissal or a statutory redundancy payment).

                              F.  PENSION SCHEMES
                                        
(1)  This sub-paragraph applies to the ICI Pension Fund governed by a deed dated
     5th March, 1996 (the "Scheme").

(2)  Except pursuant to the Scheme, the Seller has not paid, provided or
     contributed towards, and is not under any obligation or commitment (whether
     or not legally enforceable) to pay, provide or contribute towards, any
     retirement/death/disability benefit for or in respect of any Employee or
     any person previously employed in the Business (or any spouse, child or
     dependant of any of them).  For this purpose "retirement/death/disability
     benefit" means any pension, lump sum, gratuity or other like benefit given
     or to be given on retirement or on death, or in anticipation of retirement,
     or, in connection with past service, after retirement or death, or to be
     given on or in anticipation of or in connection with any change in the
     nature of the service of the employee in question or given or to be given
     on or in connection with the sickness or disability of an employee.

(3)  The Seller has included the following in the Disclosure Letter:

     (a)  copies of the documents constituting and governing the Scheme
          (including notices, announcements and explanatory literature of
          current effect);
<PAGE>
 
     (b)  a copy of the Trustees' report to members and the audited accounts of
          the Scheme (including the auditor's report) for the last scheme year
          and any short form report issued to members;

     (c)  all material particulars relating to the Employees relevant to
          establish their entitlement to benefits;

     (d)  all material particulars of any discretionary practice of the Scheme
          in the two years before the date of this agreement and of any proposal
          to operate any discretionary practice in the future (including,
          without limitation, pension increases and early retirement benefits).

(4)  The documents disclosed contain particulars of all the benefits provided by
     and the terms of the Scheme, including (but without limitation) any
     enhancement of or addition to the benefits or terms in respect of any
     person.

(5)  The Scheme is approved by the Board of the Inland Revenue as an exempt
     approved scheme within the meaning of section 592 of the Income and
     Corporation Taxes Act 1988 and so far as the Seller is aware there is no
     reason why such approval might be withdrawn or cease to apply.

(6)  The active members of the Scheme are contracted-out of the State Earnings-
     Related Pension Scheme by reference to the Scheme and so far as the Seller
     is aware there are no circumstances which might cause such certificate to
     be withdrawn or cease to apply.

(7)  Each Employee who is entitled to membership of the Scheme (whether under
     the Scheme Documents or any applicable law) has been invited to join the
     Scheme as of the date on which he became entitled.

(8)  There are no legal proceedings with regard to the benefits payable in
     respect of any Employee under the Scheme which are pending or threatened in
     writing.

(9)  No power has been exercised under the Scheme to grant or augment any
     benefit under the Scheme for or in respect of an Employee which would not
     otherwise have been provided under the Scheme Documents and no assurance
     has been given that such a power will be exercised.

(10) All contributions due from Employees who are members of the Scheme have
     been duly made.

(11) No claim has been made, or threatened in writing, by any of the Employees
     against the trustees or administrator of the Scheme, the Seller or any
     person the Seller is or may be liable to indemnify or compensate (including
     any complaint under the internal dispute resolution procedure or to the
     Pensions Ombudsman or the Occupational Pensions Regulatory Authority) in
     respect of any act, event, omission or other matter arising out of or in
     connection with the Scheme (other than routine claims for benefits) and so
     far as the Seller is aware there are no circumstances which may give rise
     to any such claim.
<PAGE>
 
                                G.  PROPERTIES

                                  See Annex 3
                                        
                           H.  INTELLECTUAL PROPERTY
  
To the extent that any warranty in this Section H is qualified by the words "so
far as the Seller is aware" or any similar statement, this statement shall be
deemed to mean such knowledge which any of those persons listed in Part 1 of
Schedule 4, John Leng, Chris Gratwick or Ann Bashir (and no other persons) had
or ought reasonably to have had at Completion in relation to the matter for
which they have responsibility.

(1)  The Seller or a member of the Seller's Group is the legal and beneficial
     owner of the Acquired Intellectual Property.

(2)  Short particulars of all registrations (or applications for registration)
     of Business Intellectual Property and material Licensed Intellectual
     Property are provided in the Disclosure Letter.

(3)  Following Completion the Purchaser will own or have licensed to it all
     Material Intellectual Property and have the right to use all Material
     Information necessary for the conduct of the Business as such Business was
     carried on by the Seller at Completion.

(4)  The Seller has not received notice that any Intellectual Property or
     Information used in the Business infringes any third party rights.

(5)  The Seller is not currently aware of attacks by others on the validity of
     any Business Intellectual Property.

(6)  All material agreements relating to the Business Intellectual Property and
     Exclusive Information to which the Seller or a member of the Seller's Group
     is a party are listed in the Disclosure Letter.

(7)  Neither the Seller nor any member of the Seller's Group is in breach or is
     aware of a breach by any third parties of any of the agreements referred to
     in paragraph (6) above which would have a material adverse effect.

(8)  So far as the Seller is aware, no third party is infringing or misusing or
     threatening to infringe or misuse any Business Intellectual Property or
     Exclusive Information.

                                     I. TAX

I.1  Duties etc.

     None of the Assets is liable to distraint, sale, mortgage, confiscation or
     forfeiture by virtue of non-payment or underpayment of any Taxation or duty
     or by virtue of non-compliance by the Seller with any legislation or
     regulation relating to any Taxation or duty.
<PAGE>
 
I.2  Capital Goods Scheme

     All Assets which are or have been subject to the provisions of Part XV of
     The Value Added Tax Regulations 1995 are listed in the Disclosure Letter
     and all adjustments required to be made pursuant to the said part on or
     before the date hereof have been properly made and properly declared to
     H.M. Customs and Excise.

I.3  Elections to waive exemption from VAT

     The Seller has not made any elections to waive exemption from VAT under
     paragraph 2 of Schedule 10 to the Value Added Tax Act 1994 in relation to
     any Property or any part of any Property which are in force.

I.4  Capital allowances

(1)  None of the Assets is leased within the meaning of section 50 of the
     Capital Allowances Act 1990.

(2)  In respect of any Assets which are plant and machinery for the purposes of
     Part II of the Capital Allowances Act 1990 and which are fixtures (as
     defined in section 51(2) of that Act) at Completion either (i) no person
     has been or will have become entitled to allowances in respect of any
     expenditure incurred on the provision of the fixture or, (ii) if any person
     has become so entitled that person has been, is or will be required to
     bring the disposal value of the fixture into account under section 24 of
     that Act otherwise than by virtue of sub-section (7) of that section.

(3)  No person other than the Seller has an interest in any Asset which is a
     fixture (by virtue of such person holding an interest in the land to which
     that fixture is attached) where such person is entitled to claim allowance
     pursuant to Part II Capital Allowances Act 1990 in respect of the fixture.

(4)  The Seller has claimed allowances pursuant to Part II Capital Allowances
     Act 1990 in respect of any machinery and plant which has become a fixture
     and which is an Asset, or where the Seller has not claimed such allowances
     the Disclosure Letter contains particulars of the disposal value (as
     defined in section 26 Capital Allowances Act 1990) brought into account by
     the last person (if any) disposing of such fixtures on or after 24 July
     1997 to claim such allowances.

I.5  Stamp Duty

     All documents in the possession or under the control of the Seller or to
     the production of which the Seller is entitled and which are necessary to
     establish the title of the Seller to any of the Assets and which attract
     stamp duty in the United Kingdom or elsewhere which would need to be paid
     in order rely on any such document before a competent court have been
     properly stamped, and, if United Kingdom stamp duty has not been paid
     because the documents have been executed and retained outside the United
     Kingdom, would not attract United Kingdom stamp duty if brought into the
     United Kingdom.
<PAGE>
 
               J. CONDUCT OF BUSINESS SINCE 30TH SEPTEMBER, 1997
                                        
(1)  Except for the purposes of giving effect to the transactions contemplated
     by this agreement the Business has since 30th September, 1997 been
     conducted and carried out only in the ordinary course consistent with its
     past practices.

(2)  Except for Plant and Equipment purchased, sold or leased in the ordinary
     course of business the Seller has not since 30th September, 1997 purchased,
     sold, leased, mortgaged, pledged or otherwise hired or disposed of any
     material Asset and without limiting the generality of the foregoing has not
     terminated, entered into or modified any contract, lease, sub-lease,
     licence or sub-licence which at Completion can reasonably be expected to
     involve income or expenditure in respect of the Business in excess of
     (Pounds)1,000,000 per annum.

(3)  Since 30th September, 1997:

     (a)  there has been no material adverse change in the Business taken as a
          whole; and

     (b)  no customer or supplier of the Business has ceased purchasing from, or
          supplying to, the Seller in connection with the Business which would
          have a material adverse effect on the Business.

                                   K. GENERAL
                                        
The slides given at the presentations made by representatives of the Seller to
representatives of the Purchaser and the written responses to written questions
copies of both of which are included in the Disclosure Letter, the information
contained in Part 2 of annex 3 of the Disclosure Letter  and the historical
pensions information contained in annex [      ] to the Disclosure Letter were
given in good faith and at the time they were given fairly presented the
historical data and facts contained therein and the Seller is not aware of any
fact which renders any such information untrue or inaccurate in any material
respect.  All such information has been given in good faith by the Seller to the
Purchaser but nothing in this agreement shall constitute a warranty in respect
of matters in the future, including any forecast of future performance of the
Business or any aspect thereof, or of any expression of opinion or judgement or
of the accuracy of any estimate.

                                 L.  INSURANCE
                                        
(1)  The Seller has produced to the Purchaser summaries of insurance policies in
     effect in relation to the Plant and Equipment and Properties which are
     relevant for the purposes of clause 5(7) and all such policies are in full
     force and effect.

(2)  The policies of insurance referred to in (1) afford the Seller adequate
     cover against such risks as companies carrying on the same type of business
     as the Business commonly cover by such insurance and in particular insure
     the Plant and Equipment and Properties against fire in their full
     replacement value.

(3)  So far as the Seller is aware, there are no circumstances which might lead
     to any liability under such insurance as referred to in (1) being avoided
     by the insurers.

<PAGE>
 
                                  SCHEDULE 8

                                   EMPLOYEES

(1)  The Seller and the Purchaser acknowledge and agree that under the
     Employment Regulations the contracts of employment between the Seller and
     the Employees and the collective agreements annexed to the Disclosure
     Letter will have effect after Completion as if originally made between the
     Purchaser and the Employees or between the Purchaser and the relevant trade
     union (as the case may be).  On or as soon as practicable after Completion
     the Seller and the Purchaser shall jointly issue to each Employee a notice
     in the Agreed Form.

(2)  Without prejudice to paragraph (1) above, if the contract of employment of
     any of the Employees is found or alleged not to have effect after
     Completion as if originally made with the Purchaser as a consequence of the
     application of the Employment Regulations to the transaction the Purchaser
     agrees that it will:

     (a)  in consultation with the Seller and within seven days of being so
          requested by the Seller, make to that Employee an offer in writing to
          employ him under a new contract of employment to take effect on the
          termination referred to below; and

     (b)  the offer to be made will be such that none of the terms and
          conditions of the new contract will differ materially from the
          corresponding provision of that Employee's contract of employment
          immediately before Completion.

     Upon that offer being made the Seller shall terminate the contract of
     employment of the Employee concerned acting lawfully in accordance with the
     terms of the contract of employment.  If such offer were not made the
     Seller may, at any time after the expiry of seven days from the request by
     the Seller, terminate the contract of employment of the Employee.  In
     either event the Purchaser shall indemnify the Seller against all
     liabilities arising out of or in connection with the termination of the
     employment of that Employee and against any such sum payable to it or in
     respect of that Employee under his contract of employment after Completion
     until such termination, including the costs of such termination.

(3)  If any contract or employment of any employee of the Seller who is not an
     Employee is found or alleged to have effect after as if originally made
     with the Purchaser as a consequence of the application of the Employment
     Regulations to the transaction the Seller agrees that it will:

     (a)  in consultation with the Purchaser and within seven days of being so
          requested by the Purchaser, make to that employee an offer in writing
          to employ him under a new contract of employment to take effect on the
          termination referred to below; and

     (b)  the offer to be made will be such that none of the terms and
          conditions of the new contract will differ materially from the
          corresponding provision of that employee's contract of employment
          immediately before Completion.

     Upon that offer being made the Purchaser shall terminate the contract of
     employment of the employee concerned acting lawfully in accordance with the
     terms of the contract of employment.  If such offer were not made the
     Purchaser may, at any time after the expiry of 

<PAGE>
 
     seven days from the request by the Purchaser, terminate the contract of
     employment of the employee. In either event the Seller shall indemnify the
     Purchaser against all liabilities arising out of or in connection with the
     termination of the employment of that employee and against any sum payable
     to it or in respect of that employee under his contract of employment.

(4)  The Seller shall discharge all its obligations in respect of the Employees
     up to Completion and shall indemnify the Purchaser against all liabilities
     arising from the Seller's failure to do so.

(5)  The Purchaser shall on and from Completion discharge all the obligations of
     the employer in relation to the Employees and shall indemnify the Seller
     against all liabilities arising from the Purchaser's failure to do so.

(6)  The Purchaser shall provide the Seller with such information and assistance
     at such times as the Seller may reasonably request or as may be necessary
     for the Seller to comply with the requirements of Regulation 10 of the
     Employment Regulations or any other requirement to consult with the
     Employees a relevant trade union or any other employee representative.

(7)  The Seller shall indemnify the Purchaser against any liability relating to
     an Employee which arises out of any act or omission by the Seller or any
     other event, matter or circumstance occurring before Completion excluding:

     (a)  any obligation in respect of the Employee's period of continuous
          employment;

     (b)  any liabilities which arise out of a failure by the Purchaser to
          comply with (4) above;

     (c)  any liability referred to in (6) below.

(8)  The Purchaser shall indemnify the Seller against any liability relating to
     an Employee which arises out of or in connection with:

     (a)  any provision of this agreement including (without limitation) the
          change of employer occurring by virtue of the Employment Regulations
          and/or this agreement;

     (b)  the termination of his employment, a change to a term of his
          employment or working conditions (including, without limitation, any
          term under an occupational pension scheme), any act or omission by the
          Purchaser or any other event, matter or circumstance occurring at or
          after Completion.

(9)  The Purchaser agrees that for a period of  two years from the Completion
     Date:

     (a)  the Employees will receive contractual remuneration and benefits
          (including retirement benefits) which in aggregate, judged
          objectively, are no less favourable than their contractual
          remuneration and benefits at the Completion Date; and

     (b)  it will not make any unilateral material change to the contractual
          terms and conditions of employment of the Employees (which would
          include as an example those contained in the 1991 Staff Agreement
          Manual) without prior consultation, 
<PAGE>
 
          where required, by any local laws or agreements, with recognised trade
          unions, appropriate employee representatives, or the Employees.

(10) In this Schedule:

     "Beneficiary" means, in relation to an indemnity, the person receiving the
     benefit of the indemnity;

     "claim" includes a claim by any person (including a trade union, a
     governmental or statutory or local authority or commission);

     "Covenantor" means, in relation to an indemnity, the person undertaking to
     indemnify the Beneficiary; and

     "liability" and "liabilities" includes any award, compensation, damages,
     fine, loss, order, payment made by way of settlement, costs and expenses
     (including legal expenses on an indemnity basis) properly incurred in
     connection with a claim and also includes the costs and expenses of any
     investigation by the Equal Opportunities Commission, the Commission for
     Racial Equality or any health and safety enforcement body and of
     implementing any requirements which may arise from any such investigation.

(11) If the Beneficiary becomes aware of any matter which might give rise to a
     claim for an indemnity from the Covenantor, the following provisions shall
     apply:

     (a)  the Beneficiary shall, within seven days of becoming aware of the
          matter, give written notice to the Covenantor of the matter in respect
          of which the indemnity is being claimed (stating in reasonable detail
          the nature of the matter and, so far as practicable, the amount
          claimed) and shall consult with the Covenantor with respect to the
          matter.  If the matter has become the subject of any proceedings the
          Beneficiary shall give the notice within sufficient time to enable the
          Covenantor time to contest the proceedings before any first instance
          judgement in respect of such proceedings is given;

     (b)  the Beneficiary shall:

          (i)  take such action and institute such proceedings, and give such
               information and assistance, as the Covenantor or its insurers may
               reasonably request to dispute, resist, appeal, compromise,
               defend, remedy or mitigate the matter or enforce against any
               person (other than the Covenantor) the rights of the Beneficiary
               or its insurers in relation to the matter;

          (ii) in connection with any proceedings related to the matter (other
               than against the Covenantor) use professional advisers nominated
               by the Covenantor or its insurers and, if the Covenantor or its
               insurers so requests, allow the Covenantor or its insurers the
               exclusive conduct of the proceedings in each case on the basis
               that the Covenantor shall fully indemnify the Beneficiary for all
               costs incurred as a result of any request or nomination by the
               Covenantor or its insurers; and
<PAGE>
 
          (iii)  not admit liability in respect of or settle the matter without
                 the prior written consent of the Covenantor, such consent not
                 to be unreasonably withheld or delayed; and

     (c)  if the Covenantor has conduct of any litigation and negotiations in
          connection with a claim, the Covenantor shall promptly take all proper
          action to deal with the claim so as not, by any act or omission in
          connection with the claim, to cause the Beneficiary to be in breach of
          its obligations to its current or past employees or to cause the
          Beneficiary's business interests to be materially prejudiced.

(12) If the Covenantor does not elect to have conduct of any litigation and
     negotiations in connection with a claim by notice in writing to the
     Beneficiary within seven days of the Beneficiary giving notice of the
     matter which might give rise to a claim for an indemnity under this clause
     the Beneficiary shall be at liberty to take such action in relation to that
     matter as it considers expedient.

(13) If the Inland Revenue brings into any charge to taxation any sum payable
     under any of the indemnities contained in this clause, the amount so
     payable shall be grossed up by such amount (such amount being referred to
     as the "gross-up amount") as will ensure that after deduction of the tax so
     chargeable there shall remain a sum equal to the amount that would
     otherwise have been payable under such indemnity.  To the extent that the
     Beneficiary subsequently obtains any tax credit, allowance, repayment or
     relief as a result of the Covenantor paying to it the gross-up amount, it
     shall pay to the Covenantor so much of the economic benefit from that tax
     credit, allowance, repayment or relief which it has received as does not
     exceed the gross-up amount (any question as to the accrual or amount of any
     such economic benefit, the order and manner of making any claim for any tax
     credit, allowance, repayment or relief, and the timing of any payment,
     being determined by the Beneficiary's auditors).

(14) Any failure by any party to exercise any rights under this clause will not
     operate as a waiver by that party of any such rights nor should it prevent
     that party from exercising the same right.  The liability of any party
     under this clause shall not be released, impaired or affected by anything
     done by or arrangements or alterations of terms made with any of the
     parties to this agreement.

(15) The indemnities given by the Covenantor in this clause are in addition to
     any rights which the Beneficiary may have at law or otherwise including,
     but not limited to, any right of contribution.

(16) The indemnities contained in this clause shall, for the avoidance of doubt,
     extend to include all costs and expenses suffered or reasonably incurred by
     the Beneficiary in connection with enforcing its rights under this clause.

(17) No statement in the Disclosure Letter shall affect any of the indemnities
     in this clause.
<PAGE>
 
                                    SCHEDULE 9

                                    PENSIONS
                                        
1.   Interpretation

(A)  In addition to the provisions of clause 1 of this agreement, this schedule
     is construed as set out in this paragraph.

(B)  The following expressions and related expressions have the same meanings as
     in the Pension Schemes Act 1993: "cash equivalent", "contracted-out",
     "guaranteed minimum pension" and "money purchase benefits".

(C)  The following expressions have the same meanings as in the Rules:
     "Pensionable Service" and "Normal Retirement Age".

(D)  The following expressions have the following meanings:

     "Actual Payment Date" means the date on which the Transfer Amount is
     actually transferred to the Purchaser's Scheme.

     "Actuary" means a Fellow of the Institute or Faculty of Actuaries or a firm
     of those Fellows or a body making available the advice of one of those
     Fellows.

     "Actuary's Letter" means the letter from the Seller's Actuary to the
     Purchaser's Actuary relating to this schedule dated 17th November, 1997, a
     copy of which appears as annex 10 to the Disclosure Letter.

     "AVCs" means additional voluntary contributions paid by Members to the
     Seller's Scheme.

     "Consenting Member" means a person:

     (a)  who is an Employee and a Member at Completion;

     (b)  who begins to accrue retirement benefits as stated in paragraph 2(B)
          under the Purchaser's Scheme as of Completion and who continues to
          accrue those benefits at the Due Payment Date; and

     (c)  in respect of whom the Seller's Scheme receives within one month of
          the distribution of election forms to Members, a signed election that
          a transfer payment be made from the Seller's Scheme to the Purchaser's
          Scheme and who does not withdraw his election.

     "Due Payment Date" means a date notified by the Seller to the Purchaser
     which is not later than one month after all the Transfer Conditions have
     been satisfied provided they then remain satisfied.

     "Exempt Approved Scheme" has the same meaning as in section 592 of the
     Income and Corporation Taxes Act 1988 and "Exempt Approved" is construed
     accordingly.

<PAGE>
 
     "Investment Adjustment" has the meaning as defined in the Actuary's Letter.

     "Member" means, at any time or during any period specified in this
     schedule, an active member of the Seller's Scheme (including a member who
     is temporarily absent under the Rules on maternity leave).

     "Purchaser's Actuary" means an Actuary appointed by the Purchaser and
     notified to the Seller for the purpose of this schedule.  Until further
     notice, the Purchaser's Actuary is Simon Lawrence of Hewitt Associates,
     Prospect House, Abbey View, St. Albans, Herts AL1 2QU.

     "Purchaser's Scheme" means the occupational pension scheme or schemes
     described in paragraph 2 and, where the context requires, includes its or
     their trustees.

     "Rules" means, in relation to the Seller's Scheme, the trust deeds, rules
     and other documents governing the Seller's Scheme as identified in the
     Disclosure Letter.

     "Seller's Actuary" means an Actuary appointed by the Seller and notified to
     the Purchaser for the purpose of this schedule.  Until further notice, the
     Seller's Actuary is Mr R T G Hails of Watson Wyatt Partners.

     "Seller's Scheme" means the retirement benefit scheme established by deed
     dated 22nd July, 1927 and governed by a deed dated 5th March, 1996 known as
     the ICI Pension Fund.  Where the context requires, the "Seller's Scheme"
     includes its trustees.

     "Transfer Conditions" means all of the following:

     (a)  The Board of the Inland Revenue has given written approval to the
          transfer of assets from the Seller's Scheme and to the Purchaser's
          Scheme in respect of the Consenting Members and any condition to which
          that approval is subject is satisfied.

     (b)  The Purchaser's Scheme is as described in paragraph 2, the invitation
          to join and the notices have been issued and the Purchaser's Scheme
          provides the benefits referred to in that paragraph and neither the
          Purchaser nor any member of the Purchaser's Group has made any
          statement to the effect that any such benefit will be reduced or
          discontinued in respect of any Employees.

     (c)  The Seller's Scheme has received the written elections that a transfer
          payment be made from the Seller's Scheme to the Purchaser's Scheme
          completed and signed by the Consenting Members.

     (d)  The calculation referred to in paragraph 3(C) has become final and
          binding as mentioned in that paragraph.

     (e)  The Seller's Scheme has received the confirmation, undertakings and
          appendices (which includes a copy of the contracting-out certificate
          in relation to the Purchaser's Scheme) set out in appendix B executed
          by the Purchaser's Scheme and those confirmations and undertakings
          remain true and effective in all material respects.
<PAGE>
 
     "Transfer Amount" and "unadjusted Transfer Amount" have the meanings given
     in paragraph 3.

2.   Purchaser's Scheme

(A)  The Purchaser will procure that the Purchaser's Scheme:

     (i)   is an Exempt Approved Scheme at Completion or is designed to be
           capable of approval by the Board of the Inland Revenue as an Exempt
           Approved Scheme with effect from Completion and at the Due Payment
           Date will be a scheme to which the Seller's Scheme can by law, and in
           accordance with Inland Revenue practice relating to Exempt Approved
           Schemes, make a transfer payment in respect of the Consenting
           Members' entire rights under the Seller's Scheme (including rights to
           guaranteed minimum pensions);

     (ii)  is contracted-out by virtue of section 9(2B) of the Pension Schemes
           Act 1993 with effect from Completion;

     (iii) provides the benefits which are offered and accepted as mentioned
           below, subject, in the case of benefits under (C), to receipt of the
           Transfer Amount and, before the full Transfer Amount has been
           transferred, those benefits must be paid by the Purchaser's Scheme to
           the extent of the assets which have been received.

(B)  The Purchaser will offer to each person who is an Employee and a Member at
     Completion, in relation to employment from and after Completion, benefits
     which are of final salary type, are in accordance with the benefit
     structure set out in Appendix A, and in the opinion of the Seller's Actuary
     are as at Completion, no less valuable than those which would prospectively
     have been provided by the Seller's Scheme for and in respect of him if he
     had continued in membership of the Seller's Scheme after Completion.  The
     Purchaser's Scheme will include in the benefits offered, an equivalent
     benefit to that provided by Rule 13(A)(iii) and (iv) of the 1949 section of
     the Rules and Rules 17 and 19 of the 1967 section of the Rules.

(C)  The Purchaser will offer to each person who is both an Employee and a
     Member at Completion for his Pensionable Service under the Seller's Scheme
     up to Completion, benefits which are of final salary type, are in
     accordance with the benefit structure set out in Appendix A, and in the
     opinion of the Seller's Actuary are, as at Completion, no less valuable
     than those which would prospectively have been provided by the Seller's
     Scheme for an in respect of him if he had continued in membership of the
     Seller's Scheme after Completion.  The Purchaser's Scheme will include in
     the benefits offered, an equivalent benefit to that provided by Rule
     13(A)(iii) and (iv) of the 1949 section of the Rules and Rules 17 and 19 of
     the 1967 section of the Rules.

(D)  The Purchaser will offer arrangements for additional voluntary
     contributions of similar type to those available under the Seller's Scheme
     at Completion.  The Purchaser will procure that the Purchaser's Scheme will
     provide under those arrangements, in respect of any Consenting Members'
     AVCs transferred to the Purchaser's Scheme, benefits which are at least
     equal in value at the date of transfer to the value of the AVCs so
     transferred.

(E)  Not later than one week after Completion the Purchaser will invite in
     writing Employees who are members of the Seller's Scheme who are still
     employed in the Business and who have not 
<PAGE>
 
     reached their Normal Retirement Age to become members of the Purchaser's
     Scheme with effect from Completion with benefits in accordance with
     paragraph 2(B), such offer not being conditional on such Employees agreeing
     to transfer their benefits in respect of past service to the Purchaser's
     Scheme. The forms of invitation referred to in this paragraph will be
     submitted to the Seller in advance of their issue, and will not be issued
     until the Seller has approved them, such approval not to be unreasonably
     withheld or delayed.

(F)  Before Completion the Purchaser will supply the Seller with a draft of a
     notice (the "notice") to be issued to Employees who were members of the
     Seller's Scheme and have joined the Purchaser's Scheme pursuant to the
     invitation referred to in paragraph 2(E) above explaining the options
     available to them in relation to their accrued rights under the Seller's
     Scheme.  Within 10 working days after receipt of the notice, the Seller
     will inform the Purchaser in writing whether the Seller agrees that the
     notice adequately explains the options and accrued rights under the
     Seller's Scheme, or of any objection thereto.  As soon as practicable after
     the notice, or any revised notice following an objection by the Seller, has
     been agreed (or, in the event of a dispute, the determination of the issue
     concerned pursuant to paragraph 8), the Purchaser will issue the notice in
     the agreed form to each person referred to in this paragraph and confirm
     such issue, with a copy of the notice, to the Seller.

(G)  In this paragraph "benefits" includes all options under the Rules and the
     rate of contributions required to be paid by Members.

3.   Calculation of Transfer Amount

(A)  The Purchaser will provide the Seller promptly with the documents and
     information necessary for the calculation of the unadjusted Transfer Amount
     and both the Seller and the Purchaser will answer any questions which the
     Seller's Actuary may reasonably have on the documents and information
     provided.  The Seller will procure that the Seller's Actuary will calculate
     the Transfer Amount within 6 weeks of receiving those documents,
     information and answers.

     The unadjusted Transfer Amount shall be calculated in accordance with the
     Actuary's Letter.  Any liability which there may be in respect of any
     difference as between a man and a woman relating to the guaranteed minimum
     pension shall not be included in the calculation.

     If any Consenting Member has more than one period of Pensionable Service
     any period before the last (the "previous periods") is ignored in that
     calculation but the unadjusted Transfer Amount includes the cash
     equivalents at Completion of the benefits (as set out in the Rules) which
     have accrued in respect of those Consenting Members for the previous
     periods.

     The Transfer Amount shall be the unadjusted Transfer Amount adjusted in
     line with the Investment Adjustment in accordance with the Actuary's
     letter.

     In calculating the Transfer Amount any benefits under the Seller's Scheme
     which are attributable to AVCs paid by the Consenting Members and in
     respect of which the Consenting Members are not entitled to benefits based
     on their final pensionable earnings, and the AVCs themselves, are
     disregarded.
<PAGE>
 
(B)  Within 14 days after the Seller's Actuary has calculated the unadjusted
     Transfer Amount the Seller (or the Seller's Actuary) will notify the
     Purchaser (or the Purchaser's Actuary) in writing of the result of that
     calculation and supply to him the particulars of the calculation (excluding
     the amount of the Investment Adjustment but including particulars of the
     precise manner in which they are calculated) and the data on which the
     calculation is based which the Purchaser's Actuary reasonably requires to
     enable him to check that the calculation is mathematically correct and in
     accordance with the terms of this schedule.  The Purchaser's Actuary has 6
     weeks from the date on which those particulars and data have been supplied
     to him in which he may raise any objection in writing that the calculation
     is incorrect or not in accordance with the terms of this schedule.

(C)  The calculation referred to above is final and binding on the Seller and
     the Purchaser on the later of (i) if the Purchaser's Actuary raises no
     objection within the terms of (B) above, the expiry of the period mentioned
     above in which he may raise an objection, and (ii) if the Purchaser's
     Actuary raises an objection within the terms of (B) above, the date of a
     subsequent written agreement between the Seller's Actuary and the
     Purchaser's Actuary that the calculation (or revised calculation) is
     mathematically correct.

4.   Transfer of Transfer Amount and AVCs

(A)  The Seller will use all reasonable endeavours to procure that on the Due
     Payment Date the Seller's Scheme transfers to the Purchaser's Scheme
     equities representing the Transfer Amount and, as at the date of transfer,
     the AVCs paid by the Consenting Members.

(B)  The Seller and the Purchaser will use all reasonable endeavours to secure
     agreement between the Seller's Scheme and the Purchaser's Scheme
     respectively as to the particular equities to be transferred representing
     the Transfer Amount.  If agreement is not reached by the Due Payment Date,
     the transfer will be in the form of equities of the Seller's Scheme
     selected by the Seller's Scheme as a representative selection held by the
     Seller's Scheme.  Any equities to be transferred will be valued at the mid-
     market price at the close of business on The London Stock Exchange on the
     day before the date of transfer.

(C)  The Purchaser will seek promptly from the Board of Inland Revenue approval
     to the transfer of assets from the Seller's Scheme to the Purchaser's
     Scheme in respect of the Consenting Members and, at the Seller's request,
     will supply promptly to the Seller the documents and information which the
     Seller reasonably requires to enable the Seller's Scheme to obtain a
     corresponding approval.

5.   Payments by Seller and Purchaser

(A)  If the Transfer Amount is not transferred in full to the Purchaser's Scheme
     within one month after the Due Payment Date as provided for in paragraph 4,
     the Seller shall, subject to (B) and (C) below, not later than one month
     after receipt of a written demand from the Purchaser, pay to the Purchaser,
     by way of an adjustment of the consideration for the Shares, the following
     amount:

     (i)  if some assets have been transferred from the Seller's Scheme to the
          Purchaser's Scheme (whether before or after that written demand is
          received) - the amount by which the Transfer Amount (calculated as at
          the date on which those assets were transferred) exceeds the value so
          transferred but the excess for this purpose shall:
<PAGE>
 
          (a)  be the excess adjusted by the Investment Adjustment as provided
               for by the Actuary's Letter; and

          (b)  be reduced (after the adjustment in (a)) if, despite some assets
               having been transferred to the Purchaser's Scheme, any benefit
               remains payable to or in respect of a Consenting Member under the
               Seller's Scheme; the reduction will be by the aggregate of the
               cash equivalents of these benefits;

     (ii) if no assets have been transferred - the amount by which the Transfer
          Amount (calculated as at the date on which payment is made to the
          Purchaser in accordance with this sub-paragraph) exceeds the aggregate
          of the cash equivalents of the benefits remaining payable to or in
          respect of the Consenting Members under the Seller's Scheme when
          payment is made in accordance with this sub-paragraph.

     For the purpose of this sub-paragraph each of the Consenting Members in
     respect of whom benefits are so payable shall be deemed to have a right to
     a cash equivalent.

     The amount derived under (i) and (ii) above is referred to below as the
     "Shortfall".

(B)  If any of the Transfer Conditions ceases to be fulfilled or effective, the
     Purchaser shall not demand payment pursuant to (A) above and the time limit
     referred to in (A) above will not commence, or (if any of the Transfer
     Conditions cease to be fulfilled or effective after the time limit has
     started to run) will be suspended, until all those conditions are again
     fulfilled and effective.

(C)  No payment shall be due from the Seller pursuant to (A) above:

     (i)  if the reason for the Transfer Amount (or part of it) not having been
          transferred to the Purchaser's Scheme by the expiry of the time limit
          referred to above is the failure of the Purchaser's Scheme for
          whatever reason to accept the whole or any part of the Transfer Amount
          or if the reason is any other reason within the control of the
          Purchaser or the Purchaser's Scheme;

     (ii) unless the Purchaser undertakes in writing to the Seller to pay any
          amount received pursuant to (A) above forthwith to the Purchaser's
          Scheme.

(D)  If payment is made by the Seller in accordance with (A) above the amount of
     that payment, will be deducted from the amount otherwise payable under
     paragraph 4(A).

(E)  If the Seller pays to the Purchaser an amount under paragraph 5(A), the
     Purchaser shall forthwith make a contribution of an equal amount to the
     Purchaser's Scheme.

(F)  If the Purchaser or any member of the Purchaser's Group obtains for the
     accounting period in which the Shortfall is paid by the Seller under this
     paragraph or in any of the four succeeding accounting periods a Tax
     Benefit, the Purchaser shall pay to the Seller an amount equal to the
     amount of the Tax Benefit.  Payment shall be made by the Purchaser
     forthwith upon the later of (i) the date on which corporation tax would
     otherwise have been paid if it had not been for the Tax Benefit or the date
     of receipt of any repayment of corporation tax and (ii) the amount of the
     Tax Benefit being certified by the auditor to the Purchaser or the
     applicable member of 
<PAGE>
 
     the Purchaser's Group, which certification the Purchaser shall procure is
     made at the earliest reasonably practicable opportunity, each accounting
     period being dealt with separately. For this purpose Tax Benefit means the
     aggregate of the amount by which a company's liability to pay corporation
     tax is reduced and the amount of any repayment of corporation tax to which
     the company is entitled which, in either case, arises as a result of the
     contribution referred to in paragraph 5(E), including any such reduction or
     entitlement attributable to a surrender by way of group relief or
     consortium relief in accordance with the provisions of sections 402 to 413
     of the Taxes Act 1988 to a member of the Purchaser's Group. The Purchaser
     shall use all reasonable endeavours to procure that a Tax Benefit is
     obtained in the earliest possible accounting period.

6.   Discontinuance of Purchaser's Scheme

     The Purchaser shall not exercise any power to terminate its liability to
     contribute to the Purchaser's Scheme before the expiry of two years from
     Completion.

7.   No assistance

     The Purchaser agrees that it will not, and will procure that the
     Purchaser's Scheme and the Purchaser's Group will not, take any action or
     provide any assistance to any person (direct or indirect) which might
     result in the Seller's Scheme transferring a smaller or a larger amount
     than the Transfer Amount and the assets representing Consenting Members'
     AVCs to the Purchaser's Scheme.

8.   Disputes

     Any dispute between the Seller and the Purchaser or between the Seller's
     Actuary and the Purchaser's Actuary concerning the calculation of the
     Transfer Amount or compliance with paragraph 3 shall, in the absence of
     agreement between them within one month of the party concerned having
     notified the other of the dispute, be referred to an independent actuary
     chosen by agreement between the parties or, failing agreement, appointed by
     the President for the time being of the Institute of Actuaries at the
     instance of either party.  The independent actuary shall determine the
     disputed matter in accordance with this schedule (including the Actuary's
     Letter) acting as an expert and not as an arbitrator and his decision shall
     be final and binding.  The fees and expenses of the independent Actuary and
     of the President shall be borne equally between the parties, except that
     the independent Actuary shall have power to determine, at the request of
     either party, that the fees and expenses shall be borne exclusively by the
     other party or in such proportions as the Actuary may determine and any
     such determination shall be final and binding.
<PAGE>
 
                                   APPENDIX A

                              SUMMARY OF BENEFITS

The intention of this appendix is to summarise the main provisions of the
Seller's Scheme as at the date of this agreement.  If there is an error in that
description the provisions of the Seller's Scheme (as set out in the Rules) will
replace the appropriate provision of this appendix.

Relationship with SERPS

Contracted-out

Normal Retirement Age

Last day of the month in which the member attains age 62.

Eligibility

All Employees who elect to join the Purchaser's Scheme.

Pensionable Service

Years and months as a member of the Seller's Scheme and the Purchaser's Scheme
prior to retirement.

Pensionable Pay

Basic annual salary plus overtime, and bonuses treated as pensionable but
excludes profit related pay bonus and holiday bonus.

Final Pensionable Pay

The greater of either final 12 months' pensionable pay or highest pensionable
pay during any tax year in the last 10 years.

State Pension Element

The pension will be reduced to take account of the State pensions earned while
the member has contributed to the Seller's Scheme under the 1967 Rules and the
Purchaser's Scheme.  This will include any graduated National Insurance pension
earned after joining under the 1967 Rules in respect of contributions to the
State Graduated Pension Scheme before April 1975 and the State Pension Element
including Graduated Pension will be calculated at leaving or retirement as:

State Single Person's Pension (averaged over 12 months) x 1967 Rules/Service
with the Buyer

                         x 1/50 plus Graduated Pension

The State Pension Element including Graduated Pension will be paid as a
temporary supplement from the later of age 50 and retirement date until State
Pension Age.  For service after 5th April, 
<PAGE>
 
1997, the State Pension Element will be subject to the same increase guarantee
as applies to pensions in payment (in excess of GMP).

Member's contributions

Members will pay contributions as a percentage of Pensionable Pay at the
difference between employee's Contracted-in and employee's Contracted-out rates
on earning between the Lower Earnings Limit and the Upper Earnings Limit and at
the rate of 6.5% above the Upper Earnings Limit.  Members may also pay
Additional Voluntary Contributions.

Member's Pension

Retirement at Normal Retirement Date

1.47% x   Final Pensionable Pay x Service under the 1948 Rules of the Seller's
          Scheme plus

2.2% x    (Final Pensionable Pay up to and including (Pounds)11,250 non
          adjustable) x Service under the 1967 Rules of the ICI Scheme/Service
          with the Purchaser plus

1.83% x   (Final Pensionable Pay - (Pounds)11,250 non adjustable) x Service
          under the 1967 Rules of the ICI Scheme/Service with the Buyer minus
          the State Pension Element including the Graduated Pension Scheme
          element.

A temporary supplement is also paid until State Pension Age equal to State
Pension Element, including the Graduated Pension Scheme element, subject to
Inland Revenue maxima.

Women employed by the Seller before 1st January, 1986 as monthly staff may
choose, on leaving, to be Special Category Members.  In this case their pension
percentages for the purposes of the above formulae will be increased as follows:

     1.47% becomes 1.69%
     2.2% becomes 2.31%
     1.83% becomes 1.93%

This pension is available from age 60.

Men in the same circumstances may choose to have their service after 17th May,
1990 calculated on the Special Category Member basis.

If a Member chooses to receive Special Category Member's benefits, no spouse's
or children's pensions will be payable in respect of those benefits.

Early Retirement

Employee initiated:

Available from age 57 without actuarial abatement with Company consent subject
to 10 years' Pensionable Service.  Pension calculated as for retirement at
Normal Retirement Date but based on Final Pensionable Pay and Pensionable
Service completed at date of retirement.  The pensionable service requirement
reduces on early retirement after the age of 57.
<PAGE>
 
Employer initiated:

Available from age 50 subject to 10 years' Pensionable Service.  Pension
calculated as above.

Ill-health Retirement

A failure of health pension is payable either:

a)   on retirement due to permanent incapacity (as certified by the Company
     Medical Officer) subject to the completion of 10 or more years' Pensionable
     Service or

b)   on retirement at any time if the Company Medical Officer certifies that
     employment is ceasing by reason of serious and permanent incapacity arising
     from injury or ill-health.  The pension is calculated in the normal manner
     except that credit is given for part of the additional service the member
     could have completed if he had continued in the Company's employment until
     Normal Retirement Date.  In the case of a) above, the special credit is
     half the member's potential service up to a maximum of 10 years.  In the
     case of b) above the special credit shall be equal to half the additional
     service the member could have completed.

Cash Option

Up to 25% of the basic pension (excluding the temporary supplement to the
pension) may be exchanged for a sum, subject to such Inland Revenue rates as are
applicable, including any maximum.

Benefits on Death while a Contributing Member

Cash                                   4 times the member's Pensionable Pay
                                       (excluding overtime) or Final Pensionable
                                       Pay if higher is paid as a lump sum.

Spouse's and Children's pension        A prospective pension (calculated on the
                                       same basis as for serious ill-health
                                       retirement) is payable to the Member's
                                       spouse during the first five years after
                                       death. Thereafter the pension reduces to
                                       52.5% of the full pension but children's
                                       pensions are payable.

Benefits on Death after Retirement

Cash                                   on death within 5 years of retirement and
                                       if no spouse's or children's pension is
                                       payable the balance of 5 years' pension
                                       payments is payable.
<PAGE>
 
Spouse's pension                       during the balance (if any) of the 5 year
                                       period after the member's retirement: 

                                       a pension calculated by reference to the
                                       amount of the pension before commutation
                                       (and including any increases granted
                                       since the pension commenced) is payable
                                       to the member's spouse.
                                       
                                       Thereafter:
 
                                       the pension payable to the spouse will
                                       reduce to 52.5% of the full pension but
                                       children's pensions will become payable.

Leaving membership

A deferred pension is payable from age 62 calculated on Final Pensionable Pay
and Pensionable Service to date of leaving.  A deferred pension may be taken at
the member's request on or after age 50 at a reduced rate (as advised by the
independent actuary).

1.   A female member may opt to receive a deferred pension at age 60 without
     reduction.

2.   A male member who opts to take his deferred pension at age 60 will have no
     reduction applied to that part of his pension attributable to his
     Pensionable Service after 17th May, 1990.

For 1. and 2. above, if Special Category Membership is adopted, they will not be
entitled to any spouse's pension earned by female members for all service and
male members for service post 17th May, 1990, apart from that required by
legislation.

A member with less than 2 years' Pensionable Service may opt for a refund of
contributions as an alternative to a deferred pension.

Pension Increases

In deferment                           increases at the statutory rate of 5% per
                                       annum or the increase in the Retail
                                       Prices Index, if less, on pension in
                                       excess of the Guaranteed Minimum Pension
                                       (GMP). Fixed rate increases on the GMP.

In payment                             guaranteed increases at the rate of 5 per
                                       cent. per annum or the increase in the
                                       Retail Prices Index, if less, on pension
                                       in excess of the GMP. Statutory increases
                                       on the GMP.

Maximum Benefits Rule

<PAGE>
 
The benefits payable will continue to be subject to the limits set out in the
Seller's Maximum Benefits Rule and the maximum laid down from time to time by
the Inland Revenue.

Seller's Supplementary Fund Benefits

Those Employees who are entitled to additional benefits under the Rules of the
Seller's Supplementary Pension Fund (which Rules form part of the Seller's
Scheme) will be entitled to additional benefits in the Purchaser's Scheme as
advised by Seller's Actuary to the Purchaser's Actuary.
<PAGE>
 
                                  APPENDIX B
                              TRANSFER AGREEMENT
                                        
                                                                 Date:
To:  The trustees of the [                       ] Scheme
From:  The trustees of the [   ] Scheme
       (the "Receiving Scheme")

Re: Employees of [              ] Limited

We request the transfer to us of the sum and/or assets referred to in Appendix 2
hereto equal in value to the Transfer Amount calculated in accordance with the
letter from [                  ] to [            ] dated [   ] 1997 in respect
of the members listed in Appendix 1 hereto (the "Consenting Members") and, in
consideration of that transfer, we hereby confirm and undertake as follows:

1.   The Consenting Members have been offered membership of the Receiving Scheme
     as of [          ], 1997 with the benefits and members' contribution rate
     described in the notice issued to them on [       ] 1997, a copy of which
     is Appendix 3 hereto (the "Notice").

2.   Each Consenting Member who has accepted that offer has been admitted to
     membership of the Receiving Scheme and has entered employment with an
     employer which participates in the Receiving Scheme and that employment is
     contracted-out by reference to the Receiving Scheme by virtue of section
     9(2B) of the Pension Schemes Act 1993 (a copy of the appropriate
     contracting-out certificate(s) is Appendix 4 hereto). Each Consenting
     Member will be entitled in respect of the Transfer Amount to benefits from
     the Receiving Scheme which are as described in the Notice and, on receipt
     of the Transfer Amount, we relieve you of all liabilities to or in respect
     of the Consenting Members.

3.   We undertake to treat the amounts previously advised as Consenting Members'
     contributions for the purposes of the Receiving Scheme and not to allow a
     refund of contributions on subsequent cessation of service or membership
     except where a refund is not prohibited by Inland Revenue restrictions or
     the preservation requirements in force under the Pension Schemes Act 1993.

4.   We confirm that the Receiving Scheme is established and administered wholly
     in the United Kingdom and is an exempt approved scheme (within the meaning
     of section 592 of the Income and Corporation Taxes Act 1988) or is designed
     to be capable of approval as an exempt approved Scheme with effect from [ ]
     and that we are permitted under the documents governing the scheme and by
     the Inland Revenue to receive the Transfer Value (a copy of the appropriate
     letter of consent from the Inland Revenue is Appendix 5).

5.   We enter into this agreement as the trustees of the Receiving Scheme so as
     to bind us and our successors as trustee(s) of the Receiving Scheme.

Add names and signatures of trustees of Receiving Scheme.
<PAGE>
 
                                  SCHEDULE 10

                                STOCK VALUATION
                           STOCK VALUATION PROCEDURES

In this Schedule references in brackets (for example (Ref. AP 144)) are
references to ICI's Controller's Manual.

1.   Stock Taking Procedure

(1)  This stocktaking procedure shall be followed to carry out a physical
     stocktake pursuant to Clause 4 of this agreement in order to quantify the
     Stock (the "Stocktake").  The Stock quantified will be valued in accordance
     with the provisions of paragraph 2 of this Schedule 10.

(2)  The Seller shall provide to the Purchaser at least 21 days before the
     Completion Date for the purposes of this Schedule 10 the following
     information relating to the Stock:

     (a) details of each location where the Stock is stored ("Stock Location");

     (b) details of the type, by unit and/or item, of Stock held;

     (c)  details of the estimated quantities and value (by unit and/or item) of
          Stock; and
     (d)  details of the Seller's existing stocktaking procedures.

(3)  For all Stock, the Stocktake shall commence at each Location at the
     Completion Date (unless otherwise agreed between the parties) commencing at
     a time to be agreed (unless otherwise agreed between the parties).

(4)  At each Stock Location:

     (a)  separate serially pre-numbered stock sheets (the "Stock Sheets") shall
          be used to record all quantities of Stock (an original and a duplicate
          copy of each);

     (b)  the Stock Sheets shall record:

          (i)  the physical location of the Stock;

          (ii) a detailed description of the Stock;

          (iii)the total quantity, by unit and/or item, of the Stock;

          (iv) the date of the Stocktake;

          (v)  the time at which the Stocktake commenced and terminated;

          (vi) the identity of the persons undertaking the Stocktake;


<PAGE>
 
     (c)  the persons undertaking the Stocktake at each Stock Location shall
          sign each Stock Sheet;

     (d)  any potentially damaged or out of specification quantities of the
          Stock with a brief description of the nature of the potential damage
          or deviation from specification shall be recorded on separate Stock
          Sheets from those referred to in sub-paragraph (b) above;

     (e)  for the Stock, where book records are available, they shall be
          reconciled to the Stock counted at the Stocktake and any discrepancies
          between the two sets of figures up to 90% of the total value of
          discrepancies shall be checked and the actual quantities shall be
          confirmed;

     (f)  procedures shall be agreed between the parties (if appropriate) to
          avoid omission or double counting of Stock;

     (g)  where necessary, meters at each Stock Location shall be read at the
          Completion Date or as close as is practicable to that time and, if
          appropriate, adjusted back to the Completion Date by applying the
          relevant production/consumption rates; and

     (h)  the Purchaser and the Purchaser's Auditors shall have the right to
          attend the Stocktake and to perform tests.

(5)  The Stocktake at each Stock Location shall be deemed to have been completed
     when the Seller shall have received all of the Stock Sheets (including
     those in sub-paragraph (4)(a) above) for each Stock Location and shall have
     signed the Actual Values Certificate (as defined in this Schedule 10)
     confirming the quantities of the Stock recorded on the Stock Sheets and
     shall have provided the Purchaser with true copies of such Stock Sheets and
     the Actual Values Certificate as defined in paragraph 3(1) below.

(6)  The Seller shall retain the original Stock Sheets and the duplicate of the
     same shall be retained by the Purchaser.

(7)  The Seller and the Purchaser shall use all reasonable endeavours to ensure
     that no deliveries to or despatches from any of the Stock Locations shall
     take place during the Stocktake provided that this shall not restrict the
     right of the Seller or the Purchaser to continue production, deliveries or
     despatches at any Stock Location.

(8)  Although it is the Seller's responsibility to undertake the Stocktake, the
     Seller shall require the assistance of the Purchaser's employees to fulfil
     this responsibility and the Purchaser shall ensure such assistance is
     provided at no charge.

2.   Valuation of Stock

     The valuation shall be made in accordance with principles laid down in
     ICI's Controller's Manuals as consistently applied by the Business.  "ICI
     Controller's Manuals" means the control manuals in existence as at the date
     of this agreement which are compiled in accordance with UK GAAP and used
     for accounting purposes within the ICI Group and which are recorded on disk
     form as attached and identified as Annex 8 of the Disclosure Letter (and
     which consists of an introduction to the Group Controller's Manual,
     Bulletin 


<PAGE>
 
     Board Accounting Language, Bulletin Board Reporting, Accounting
     Definitions and Conventions, Accounting Policies and Procedures, Controls,
     Reporting).  The following are key extracts relevant to this agreement.

(1)  Valuation of the Stock (to be quantified in accordance with the provisions
     of Clause 1 of this Schedule 10) shall be conducted by the Seller.  In this
     paragraph 2 of Schedule 10 the valuation of the Stock shall be calculated
     by reference to the Cost (as hereinafter defined) of the Stock unless
     otherwise indicated herein.

(2)  Subject to the provisions of paragraph 2(3), "Cost" for the purposes of the
     valuation of the Stock shall be calculated in accordance with the Seller's
     usual accounting conventions as applied in the past and shall have the
     following meanings:

     (a)  in respect of raw materials and ingredients and packaging which are
          purchased by the Seller (and any other member of the Seller's Group)
          from sources external to the Seller's Group, Cost shall be the lower
          of the unit rate recorded in the Seller records at the Completion Date
          which will include the purchase price, including non-recoverable
          duties, transport and handling costs and any other directly
          attributable costs, less trade discounts, rebates and subsidies
          incurred to acquire the same (Ref. AP 143 2.2.1) and net realisable
          value (as defined below);

     (b)  in respect of raw materials and ingredients and packaging which are
          purchased by the Seller (or another member of the Seller's Group) from
          another business owned by a member of the Seller's Group, Cost shall
          be the lower of the unit rate recorded in the Seller stock records at
          the Completion Date which will include the internal transfer price
          charged by that other business together with any duties, transport and
          handling costs and any other directly attributable costs incurred to
          acquire the same and net realisable value (as defined below);

     (c)  in respect of each Manufactured Products (Ref AD 12123), Cost shall be
          the lower of either:

          (i)  the variable production cost as recorded in the Seller stock
               records at the Completion Date plus the unit rate of fixed cost
               of production (including depreciation and plant and work's
               overheads) for 1997, the unit rate of fixed cost of production
               being the budgeted fixed costs of production divided by the
               budgeted production (Ref. AP 142); or

          (ii) net realisable value, being Sales Value less Variable Selling
               Expenses as defined in (Ref. AP 144);

     (d)  in respect of each of the scrap quality Manufactured Products, Cost
          shall be zero;

     (e)  in respect of Purchased Products (Ref. AD 1213), Cost shall be the
          lower of:

          (i)  the unit rate recorded in the Seller records at the Completion
               Date which will include the purchase price together with any non-
               recoverable duties, transport and handling costs and any other
               directly attributable costs to acquire the same; or


<PAGE>
 
          (ii) the net realisable value, as defined in sub-paragraph
               2(2)(c)(ii) of this Schedule;

     (f)  in respect of work-in-progress, Cost shall be the lower of the cost of
          issues of materials (including intermediaries and finished product)
          input to the process (Ref. AD 12121/AP 143) and net realisable value
          (as defined above).

(3)  At the completion of the valuation of Stock within the period as defined in
     paragraph 3(1) below, the Seller shall issue the Actual Values Certificate.
     The Seller shall provide to the Purchaser copies of the supporting working
     papers, if requested to do so.

3.   Certification and Resolution Disputes

(1)  At the Completion Date or as soon as reasonably practicable thereafter and
     in any event no later than twenty one days after the Completion Date, the
     Seller shall prepare and issue to the Purchaser a detailed schedule showing
     the calculation of the values of Stock.  Such schedule shall be the Actual
     Values Certificate and shall be expressed in Pounds Sterling (or in local
     currency of the Business if it is not located in the UK).

(2)  The Purchaser shall within a period of twenty one days from receipt of the
     Actual Values Certificate from the Seller either issue its confirmation
     thereof or shall state in writing if it disagrees (providing reasons and
     reasonable details of the areas of dispute and quantifying the amount
     thereof) in default of which it shall be deemed to have confirmed the
     Actual Values Certificate.  During the said period the Seller shall supply
     to the Purchaser such information as it may reasonably require to show how
     the Seller has arrived at the values contained in the Actual Values
     Certificate and will allow them full access to their working papers
     supporting the calculation of such values.

(3)  If the Purchaser shall disagree with any element or elements of the
     calculation of the values in the Actual Values Certificates then the
     parties shall attempt to resolve the issues between them.  Any such
     resolution shall be expressed in a joint report (the "Joint Resolution")
     signed by both the Seller and the Purchaser stating the values agreed upon.

(4)  If no Joint Resolution has been signed by both parties within a period of
     thirty-nine days from the issue of the Actual Values Certificate the
     element or elements within the calculation of the values in the Actual
     Values Certificate with which the Purchaser disagrees (the "area of
     dispute") may be referred by either party to an Independent Accountant in
     accordance with clause 22 of this agreement.

(5)  The Seller and the Purchaser shall procure that all records, working papers
     and other information as may be reasonably required by the Independent
     Accountant for the purposes of this Schedule shall be made available upon
     request therefore and they shall generally render all assistance reasonably
     necessary for the preparation of the Confirmed Actual Values Certificate.

(6)  For the purposes of this Agreement the Confirmed Actual Values Certificate
     shall mean:

     (i)  the Actual Values Certificate (if such certificate is confirmed by the
          Purchaser pursuant to paragraph 3(2) above);
<PAGE>
 
     (ii)   the Joint Resolution (if a disagreement shall have been resolved
            pursuant to paragraph 3(3) above); or

     (iii)  the Actual Values Certificate as amended by the Independent
            Accountant (if any matters shall be referred to them pursuant to
            paragraph 3(4) above).
<PAGE>
 
                                  SCHEDULE 11

                                 ENVIRONMENTAL
                                        
1.   INTERPRETATION

     For the purposes of this Schedule, words and expressions defined in the
     Sale of Business Agreement to which this Schedule is attached shall have
     the same meaning in this Schedule and, in addition, the following terms
     shall have the following meanings:

     "Commercially Reasonable Expenses" are those costs and expenses which a
     reasonable person acting in a commercially prudent manner taking into
     account the need to minimise his expenditure would expend to meet any
     Environmental Liabilities.  For the avoidance of doubt Commercially
     Reasonable Expenses shall not include any cost or expenses incurred as a
     result of the adoption or imposition of standards of clean-up more
     stringent than those which are provided for under Environmental Law which,
     in the event of a dispute, shall be determined solely by the Expert under
     subparagraph 11(iii);

     "Controlled Waters" means any ground or surface waters to which
     Environmental Law applies;

     "Environment" means air, Controlled Waters, land (whether on, in or below
     such land, excluding any buildings or other permanent structures on, in or
     below the land), and flora and fauna including man;

     "Environmental Contamination" means any discharge, release, leakage,
     spillage, escape or disposal or presence of Hazardous Material at, in, on
     or under the Properties;

     "Environmental Laws" means any and all legislation, regulations, orders or
     common law relating to protection of the Environment which as at the
     Completion Date are in effect and capable of enforcement by legal process
     in the U.K., including, for the avoidance of doubt, Part IIA of the
     Environmental Protection Act 1990 and the first set of statutory guidance
     which is brought into force thereunder, and any subsequent set to the
     extent that they do not impose materially more onerous obligations, as if
     such provisions and guidance were in full force and effect at the date
     hereof;

     "Environmental Liabilities" means:

     (i)  all claims, costs, expenses (including reasonable professional fees
          incurred), losses, liabilities, fines or penalties necessarily
          suffered or incurred by the Purchaser (or the Seller or any member of
          the Seller's Group in the case of the Counter Indemnity) pursuant to
          any Environmental Proceedings;

     (ii) for the purposes only of an Environmental Remediation Agreement, all
          claims, costs, expenses (including reasonable professional fees
          incurred), losses or liabilities (including the cost of carrying out
          remediation of Environmental Contamination) to the extent necessarily
          suffered or incurred by the Purchaser (or the Seller or any member of
          the Seller's Group in the case of the Counter Indemnity) in order to
          avoid an environmental authority bringing an Environmental Proceeding
          which, in the 
<PAGE>
 
          event of a dispute, shall be determined solely by the Expert under
          subparagraph 11(ii);

     BUT EXCLUDING any claims, costs, damages, expenses, losses, liabilities or
     penalties to the extent that they are not Commercially Reasonable Expenses;

     "Environmental Proceeding" means any writ and/or interim or final judicial
     or administrative decree, judgment, injunction, order or notice brought or
     served on or against the Purchaser (or the Seller or any member of the
     Seller's Group in the case of the Counter Indemnity) under which it is
     obliged due to action taken by any regulatory authority pursuant to
     Environmental Laws to undertake or pay the cost of clean-up of
     Environmental Contamination and/or fines or penalties arising as a result
     of Environmental Contamination;

     "Environmental Remediation Agreement" means any agreement between the
     Seller and the Purchaser that it is reasonably necessary to undertake
     remediation of Environmental Contamination or, in the event of
     disagreement, any determination by the Expert that:

     (i)  Environmental Contamination is present in circumstances where an
          environmental authority has the power to issue an Environmental
          Proceeding against the Purchaser or the Seller which would, if so
          issued, result in a requirement to carry out remediation; and

     (ii) the environmental authority would, but for the fact that it is
          unaware of the Environmental Contamination concerned, be more likely
          than not to bring such an Environmental Proceeding in relation to such
          Environmental Contamination;

     PROVIDED THAT for the purposes of the determinations in both (i) and (ii)
     above;

     (i)  it is to be assumed that the party or parties against whom such an
          Environmental Proceeding would be brought have not reached and would
          not reach agreement regarding voluntary clean-up  with the relevant
          environmental authority; and

     (ii) the Expert is to take no account of Environmental Contamination
          and/or circumstances existing to the extent that either would not be
          present had the Purchaser complied with its duty to mitigate under
          paragraph 5;

     "Hazardous Material" means hazardous or harmful or toxic substances,
     pollutants or wastes;

     "Indemnity" means the indemnity contained in paragraph 2 below;

     "Site(s)" means the Properties as defined in the agreement of which this
     Schedule forms part;

2.   INDEMNITY

(1)  The Seller undertakes to the Purchaser that, subject to the provisions of
     this agreement, it will indemnify and hold harmless the Purchaser against
     all Environmental Liabilities arising at or from the Site(s), to the extent
     that such Environmental Liabilities are a direct result of Environmental
     Contamination occurring on or before the Completion Date.
<PAGE>
 
(2)  Notwithstanding paragraph 2(1) above neither the Seller nor any member of
     the Seller's Group shall be liable under the Indemnity or otherwise to the
     extent that such liability arises from or is attributable to the failure of
     the Purchaser to comply with the provisions of paragraphs 4(1), 4(4) and 5
     to 14.

3.   THE COUNTER INDEMNITY

(1)  The Purchaser undertakes to the Seller (for the benefit of the Seller and
     any member of the Seller's Group) that, subject to the provisions of this
     agreement, it will indemnify and hold harmless (the "Counter Indemnity")
     the Seller and any member of the Seller's Group from and against all
     Environmental Liabilities arising at or from the Site(s) after the
     Completion Date save to the extent that such Environmental Liabilities fall
     within the Indemnity.

(2)  Notwithstanding subparagraph 3(1) above, the Purchaser shall not be liable
     to the Seller under the Counter Indemnity or otherwise to the extent that
     such liability arises from or is attributable to the failure of the Seller
     to comply with the provisions of paragraphs 6-8, 10, 11, 13 and 14 of this
     Schedule.

4.   LIMITATIONS

(1)  Neither the Seller nor any member of the Seller's Group shall be liable
     under the Indemnity to the extent that Environmental Liabilities have
     arisen:

     (a)  due to any act or omission of the Purchaser or any employee, agent,
          contractor or Affiliate thereof which is outside the normal course of
          business and which the Purchaser knew or ought reasonably to have
          known could give rise to a claim under the Indemnity, provided, for
          the avoidance of doubt and subject to the duty to mitigate in
          paragraph 5, that the Purchaser shall not be considered to have made
          such an omission solely by a non-negligent failure to undertake
          precautionary investigatory or remediatory work in relation to
          Environmental Contamination; or

     (b)  as a result of a change in use of the Site(s) to a use which is more
          sensitive to Environmental Contamination; or

     (c)  due to any negligent act or omission of the Purchaser or any employee,
          agent, contractor or Affiliate thereof.

(2)  No claim against the Seller or any member of the Seller's Group under the
     terms of the Indemnity for any Environmental Liabilities shall be valid
     unless notice has been served on the Seller in accordance with the
     provisions of paragraph 7 within 10 years of the Completion Date.

(3)  The maximum aggregate liability of the Seller and all members of the
     Seller's Group in respect of all and any claims under the Indemnity and
     warranties in paragraph A.6 of Schedule 7 shall not exceed (Pounds)100
     million.

(4)  The Seller shall not be liable in respect of any Environmental Liability to
     the extent that such Environmental Liability arises:
<PAGE>
 
     (a)  as a result directly or indirectly of information voluntarily given by
          or on behalf of the Purchaser to a regulatory authority in
          circumstances other than where there is a mandatory reporting
          requirement under Environmental Law or where the Seller has previously
          proposed or approved this course of action in writing, such approval
          not to be unreasonably withheld or delayed; and/or

     (b)  from any admission of liability by the Purchaser in respect of any
          clean-up which needs to be done, except where the Seller has approved
          such admission in writing, such approval not to be unreasonably
          withheld or delayed.

(5)  If the Indemnitor (as defined in paragraph 6(1)) makes any payment in
     respect of any Environmental Liabilities under the Indemnity or Counter
     Indemnity, as the case may be, (the "Indemnity Payment") and the Claimant
     (as defined in paragraph 6(1)) receives any benefit otherwise than from the
     Indemnitor which would not have been received but for the circumstances
     giving rise to the claim in respect of which the Indemnity Payment was
     made, the Claimant shall, once it has received such benefit, forthwith
     repay to the Indemnitor an amount equal to the lower of the amount of such
     benefit and the Indemnity Payment.

(6)  In the event that the Indemnitor (as defined in paragraph 6(1)) either
     incurs external charges, costs and expenses for environmental services or
     internal charges for its own environmental services, in either case
     including but not limited to testing and/or analytical services and/or
     contaminated soil disposal facilities, in connection with or in relation to
     any actual or potential Environmental Liabilities under the Indemnity or
     Counter Indemnity (as appropriate) then such external charges, costs and
     expenses shall be deemed to be payments made under the Indemnity or Counter
     Indemnity (as appropriate).  Any internal charges shall be made on the same
     basis as the Indemnitor charges to its own business or its Affiliates.

(7)  It is hereby expressly agreed that, save where the Seller has accepted
     liability or is otherwise liable under the terms of the Indemnity, all
     costs incurred by the Purchaser in carrying out environmental analyses and
     tests of the Site(s) (and its (or their) surrounds) shall be borne by the
     Purchaser.

5.  MITIGATION

     The Purchaser shall take all reasonable steps to avoid or mitigate any
     Environmental Liabilities and/or potential Environmental Liabilities which
     may give rise to a claim under or in connection with this Indemnity
     howsoever arising.  Where and to the extent such steps require expenditure,
     the costs will be borne by the Seller provided that, except in the case of
     emergency or imminent danger to public health or safety, the Seller has
     agreed in advance to the performance of the steps by the Purchaser, such
     agreement not to be unreasonably withheld or delayed.  In the event such
     steps would involve any substantive clean-up, any dispute as to whether
     such agreement is unreasonably withheld or delayed shall be referred to the
     Expert for determination, who shall have regard to the matters set out in
     subparagraphs 11(i) to (iv).  Such steps may include but shall not be
     limited to:

     (a)  carrying out soil tests before taking any action which is likely to
          cause a material disturbance to soil;
<PAGE>
 
     (b)  carrying on its activities on the Site(s) so as to minimise
          disturbance to known areas of existing or probable contamination and
          take all necessary steps to protect human health;

     (c)  the Purchaser (with the approval of the Seller) settling a claim which
          will or may fall within the terms of the Indemnity, the costs and
          expenses associated with such settlement (so approved by the Sellers)
          being deemed to be Environmental Liabilities for the purposes of this
          agreement;

     (d)  making reasonable and timely efforts to pursue claims against any
          third parties (including insurers) who may have some liability to the
          Purchaser in respect of the matter in question; and

     (e)  avoiding acts or omissions of the nature described in paragraph 4(1).

6.   NOTIFICATION

(1)  As soon as reasonably practicable after either party (the "Claimant")
     becomes aware of any actual or potential Environmental Liabilities which
     may give rise to a claim by it under the Indemnity or Counter Indemnity
     (whether or not the Claimant is of the opinion that it has a valid claim
     against the other party (the "Indemnitor") under the Indemnity or Counter
     Indemnity or, in the case of any potential Environmental Liabilities, that
     no liability will in fact arise), the Claimant shall give written notice
     thereof to the Indemnitor (and thereafter will keep the Indemnitor fully
     informed of all material developments relating thereto).  Such written
     notice shall include all material details of any actual or potential
     Environmental Liabilities (including the Claimant's reasonable estimate of
     the extent of and cost of clean-up of the Environmental Liabilities as a
     result thereof).

(2)  Neither party shall admit, settle compromise or discharge any claim or
     liability or make any proposal which might constitute or lead to a claim
     against the other under the Indemnity or Counter Indemnity (as appropriate)
     without having first served a notice under this paragraph 6 and given the
     other a reasonable opportunity to consider the circumstances referred to in
     the said notice.

7.   CLAIMS

(1)  In the event that the Claimant wishes to make a claim against the
     Indemnitor under the Indemnity or Counter Indemnity (as appropriate) in
     relation to any Environmental Liabilities (whether or not suffered or
     incurred) then, subject to paragraph 7(2), it shall do so by giving notice
     in writing of the same to the Indemnitor.

(2)  The Claimant shall not be entitled to claim under this Schedule for any
     actual or potential Environmental Liabilities in relation to either an
     Environmental Proceeding or Environmental Remediation Agreement unless, in
     each case, the Claimant has properly served a written notice on the
     Indemnitor which specifies reasonable details of the nature, extent and
     location of the Environmental Contamination concerned and specifies the
     claim with sufficient particularity, including, without limitation, the
     circumstances giving rise to the Claimants' view that such Environmental
     Contamination gives rise to an Environmental Liability.
<PAGE>
 
8.   CONDUCT

     If any notice is received by either party under paragraphs 6 or 7 the
     Claimant shall if so requested by the Indemnitor take all steps which are
     necessary and reasonable to avoid, mitigate, dispute, resist, appeal,
     settle, compromise, contest or defend any claim and any adjudication in
     respect thereof and reasonable costs incurred by the Claimant due to its
     taking such steps will be borne by the Indemnitor.  Subject to consultation
     with the Claimant, the Indemnitor shall, at its request and its cost, be
     allowed to conduct any negotiations, proceedings or appeals relating to
     any claim or potential claim.

9.   SITE ACCESS

     If any notice is received by the Seller under paragraphs 6 or 7, subject,
     except in the case of emergencies, to the Seller giving written notice
     three days prior to any site access and the Seller agreeing to comply with
     all reasonable instructions of the Purchaser's site engineers:

     (a)  the Seller and/or its agents and contractors shall be free to have
          access to the Site(s) during normal business hours to assess
          (including but not limited to assessment by soil sampling and testing)
          the extent of the Environmental Liabilities and/or potential
          Environmental Liabilities and to determine the action required in
          order to clean-up such liabilities; and

     (b)  the Purchaser shall (during normal business hours) allow the Seller or
          its agents access to inspect and take copies of such books and records
          of the Business of the Purchaser relating to the Site(s) as may be
          necessary in connection with any Environmental Liabilities and/or
          potential Environmental Liabilities.

10.  DISCUSSIONS

     Upon either party having given a notice under paragraphs 6 or 7, either the
     Seller or the Purchaser may request a meeting as soon as practicable to
     discuss the matter (and if either does so the other party shall comply
     promptly with such request) and, irrespective of whether there has been any
     agreement on liability, each party shall be fully involved in any
     discussions and/or negotiations with any party imposing or seeking to
     impose any Environmental Liabilities including reaching agreement with any
     regulatory authority on measures required to avoid such Environmental
     Liabilities.

11.  DISPUTE RESOLUTION

     Upon either party giving a notice in accordance with paragraph 7, for the
     purposes of a determination under the definition of Environmental
     Remediation Agreement and/or in the event that the Seller and Purchaser are
     unable to agree promptly the issues set out in subparagraphs (i), (ii),
     (iii) and (iv) below:

     (i)    the remediation measures required to comply with an Environmental
            Proceeding; or

     (ii)   the remediation measures required and/or the costs which it is
            necessary to suffer or incur to avoid in either case an
            environmental authority bringing an Environmental Proceeding; or
<PAGE>
 
     (iii)  whether any costs or expenses incurred in cleaning up Environmental
            Contamination pursuant to Environmental Law are incurred or suffered
            as a result of the adoption of standards of clean up more stringent
            than those which are provided for under Environmental Law; or

     (iv)   any factual matter relevant to a claim under this Indemnity or
            Counter Indemnity (as appropriate);

     the following provisions of this paragraph 11 shall apply:

     (a)  a reputable independent firm of experts (the "Experts") (who shall act
          as experts and not arbitrators) in respect of the Environment relevant
          to the claim or potential claim (having at least 10 years relevant
          experience) shall be appointed by mutual agreement of the parties
          hereto (and the parties shall each be obliged to use their respective
          best endeavours to reach agreement as soon as practicable) to resolve
          any factual matter in dispute between the parties but not including
          any interpretation of laws or regulations as they apply to such
          factual matters, except where such is necessary for the purpose of
          making the determinations or agreements referred to in paragraphs 11,
          11(i), (ii) and (iii) above, or any conclusions regarding
          responsibility or liability for or in relation to any factual matters.
          The Experts shall be offered the appointment within fifteen (15)
          Business Days of the parties reaching such mutual agreement and shall
          be notified in writing of the provision of subparagraph (g) below.
          Failing such mutual agreement on the appointment of Experts, the
          parties shall promptly refer the issue, at their joint cost, to the
          President for the time being of the Royal Institute of Chartered
          Surveyors in the United Kingdom with instructions to appoint suitable
          Experts within seven (7) days of receipt of such instructions;

     (b)  the said Experts shall only be dismissed by the mutual agreement of
          the parties hereto;

     (c)  both parties shall promptly and simultaneously, exchange with each
          other and submit to the Experts, and in any event in accordance with
          the Experts' written directions, their arguments and submissions in
          connection with any matter of fact referred to the Experts in
          accordance with this paragraph 11;

     (d)  following receipt by the Experts of the written arguments and other
          submissions of the parties pursuant to paragraph 11(c), the parties
          shall instruct the Experts to issue, as soon as reasonably
          practicable, a formal written opinion pertaining to the matter of fact
          referred to them.  In any event the Experts shall be instructed to
          present the said opinion within two months of receiving the written
          arguments and other submissions of the parties pursuant to paragraph
          11(c);

     (e)  the formal written opinion of the Experts issued pursuant to paragraph
          11(d) shall be conclusive in any proceedings between the parties
          hereto as to the question of fact so determined;

     (f)  the fees and expenses of the Experts, shall be borne equally by the
          Seller and the Purchaser (unless otherwise directed by the Expert or
          recoverable pursuant to a claim under the Indemnity or Counter
          Indemnity as the case may be); and

<PAGE>
 
     (g)  the Experts, and any company, firm, partnership or other organisation
          with which the Experts are connected shall not be eligible to be
          considered to undertake any clean-up work in respect of the claim for
          which they have so acted on or around the Site(s) save where the
          parties hereto mutually agree to waive this provisions.  For the
          avoidance of doubt, either party may withhold such consent in any
          event.

12.  ACCEPTANCE OF LIABILITY

     In the event that the Seller admits that it has any liability to the
     Purchaser under the Indemnity relating to clean up (or where the Seller
     agrees to accept the Purchaser's claim as falling within the Indemnity
     notwithstanding the fact that no Environmental Liability may at that point
     in time have arisen):

     (a)  the Seller shall have the right independently to carry out the clean-
          up of the Environmental Contamination which is the subject matter of
          the claim itself (or through suitable third party agents or
          contractors) provided that in so doing (i) the Seller  shall procure
          that any such clean-up is to carried out to such standard as is
          reasonably necessary in the circumstances to comply with the
          requirements of Environmental Law having regard to the nature and
          extent of the Environmental Contamination, and (ii) there shall be
          full consultation with the Purchaser and (iii) the Seller and its
          agents or contractors shall accede to any reasonable requests from the
          Purchaser as to the conduct of remediation;

     (b)  the Seller and/or its agents and contractors shall, in addition to the
          rights of access provided for in paragraph 9 above, be free to have
          access to the Site(s) during normal business hours to carry out the
          clean-up referred to in paragraph 12(a) above;

     PROVIDED THAT in relation to both subparagraphs (a) and (b) above, if the
     carrying out of such clean-up operations would be likely to cause material
     disruption to the carrying on of the Business at any Site(s), the parties
     shall agree the appropriate and reasonable means of avoiding such
     disruption in the circumstances.

13.  STATEMENTS

     In the event of any circumstances arising which do or may give rise to
     Environmental Liabilities which may fall within the terms of the Indemnity
     or the Counter Indemnity (as appropriate) neither the Purchaser nor the
     Seller (nor any of their respective Affiliates) shall make any public
     statements (including, for the avoidance of doubt, any statement to any
     regulatory authority, unless required by law or in an emergency) regarding
     such circumstances without first discussing with the other party and
     reaching written agreement on the text of any such public statement before
     it is made.

14.  GENERAL

(1)  Any information, records, or other material of one party shall be treated
     as strictly confidential by the other party except when it is required to
     be used in order to comply with an order of the court or regulatory
     authority or it is used by the other party to enforce its rights under this
     Schedule 11 or so as to make an insurance claim.

(2)  The Purchaser's and its Affiliates' exclusive remedies in respect of
     Environmental Claims shall be in accordance with the provisions of this
     Schedule 11 and the environmental 

<PAGE>
 
     warranties in paragraph A.6 of Schedule 7 (the "Environmental Warranties"),
     and the Purchaser on behalf of itself and its Affiliates hereby waives all
     other remedies whether in contract, tort (including, for the avoidance of
     doubt, negligence) but without prejudice to its rights under clauses 5(6)
     and 15, or howsoever otherwise arising which it may have against the Seller
     or any member of the Seller's Group at law or in equity in respect of the
     matters which fall within the scope of the Indemnity or the Environmental
     Warranties and, for the avoidance of doubt, if such an Environmental Claim
     could also give rise to a claim under any other provision of this
     agreement, the Purchaser may only bring a claim under this Schedule or the
     Environmental Warranties or clauses 5(6) or 15.

(3)  Nothing in the preceding paragraph shall permit the Purchaser any double
     recovery in respect of the same loss.

<PAGE>
 
                                  SCHEDULE 12

                     CONDUCT OF BUSINESS UP TO COMPLETION
                                        
(1)  In the period from the date of this agreement until the Completion Date,
     the Seller shall (in so far as it is within its power to do so) procure
     that except with the prior consent of the Purchaser:

     (a)  the Business is not carried on other than other than in the ordinary
          course consistent with past practice over the 12 months prior to the
          date of this agreement;

     (b)  projects which the Seller has commenced to implement within the
          Business are not discontinued or progressed other than pursuant to
          their respective project plans; and

     (c)  except as required by law or by any governmental, administrative or
          judicial authority of competent jurisdiction or pursuant to any
          existing agreement it will not;

          (i)   dispose of, or grant any security over or any interest in, any
                material property or plant and equipment used in the Business
                otherwise than in the normal course of business; or

          (ii)  terminate, enter into or amend to any material extent any
                material contract or arrangement or commitment (whether
                conditional or unconditional) the term of which will extend more
                than six months beyond the Completion Date or which would oblige
                the Purchaser to expend capital of (Pounds)300,000 or more
                (provided that this subparagraph (ii) shall not apply to any
                such contract, arrangement or commitment which is in the normal
                course of business which shall include, but not be limited to,
                the extension or replacement of existing contracts, arrangements
                or commitments); or

          (iii) appoint any new Senior Employee or terminate the employment of
                any Senior Employee (other than for breach of his or her
                employment contract) (for the purposes of this subclause a
                Senior Employee shall mean an employee in ICI's Grade 40 or
                above) or make a change in the terms of employment or pensions
                benefits of any employees except in the ordinary course of
                business; or

          (iv)  increase or reduce the number of employees engaged in Business
                other than in accordance with plans which have been disclosed to
                the Purchaser prior to this agreement.

(2)  Prior consent requested from the Purchaser by the Seller under (1) shall
     not be unreasonably withheld or delayed by the Purchaser.

(3)  The requirement for consent under this Schedule 12 shall be overridden and
     this Schedule 12 shall not be breached in the event that the Seller can
     demonstrate that it was necessary for it to take the relevant action
     without the prior written consent of the Purchaser due to emergency
     operational requirements which would have caused significant operational
     difficulties if not remedied before it was practicable to consult with and
     obtain the consent of
<PAGE>
 
     the Purchaser and provided further that the Purchaser is notified by the
     Seller of such step as soon as the Seller is reasonably able to do so.

(4)  In the period from the date of this agreement until the Completion Date
     each of the Seller and the Purchaser shall use all reasonable endeavours in
     obtaining any third party consents necessary for the transfer of the
     Contracts pursuant to clause 6 of this agreement and to transfer or obtain
     any permits, consents, licences and authorisations of the Business and,
     without prejudice to the generality of the foregoing, the Purchaser and the
     Seller shall make all relevant notifications and applications in respect of
     such permits, consents, licences and authorisations.
<PAGE>
 
                                    ANNEX 1
                           IMPLEMENTATION AGREEMENTS
                             (not in Agreed Form)
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------
SUPPLIER                     PURCHASER                              AGREEMENT
                                                                    (Schedule)
- ------------------------------------------------------------------------------------------------------
<S>                          <C>                       <C>
GOOSE                        ALPHA                                   SERVICES
                                                                   Process Pipes
                                                                   Interface Ops
                                                                 Site Road System
- ------------------------------------------------------------------------------------------------------
GOOSE                        ACRYLICS                                SERVICES
                                                                   Process Pipes
- ------------------------------------------------------------------------------------------------------
GOOSE                        KATALCO                                 SERVICES
                                                                 Site Road System
                                                                  Process Pipes
- ------------------------------------------------------------------------------------------------------
PLYMOUTH                     GOOSE                                   UTILITIES
                                                               Compressed Air Supply
- ------------------------------------------------------------------------------------------------------
PLYMOUTH                     GOOSE                                   SERVICES
                                                                Pay Roll Services
                                                                  Jetty Services
- ------------------------------------------------------------------------------------------------------
GANDER                       GOOSE                                   MATERIALS
                                                                   Instrument Air
- ------------------------------------------------------------------------------------------------------
GOOSE                        HALOCHEMICALS                           UTILITIES
                                                                    Potable Water
                                                               Gately Water/Fire Water
- ------------------------------------------------------------------------------------------------------
GOOSE                        HALOCHEMICALS                            SERVICES
                                                       Transport of process pipes and cabling via
                                                                     pipebridges
- ------------------------------------------------------------------------------------------------------
GOOSE                        HALOCHEMICALS                           ELECTRICITY
                                                                  50 Hz Electricity
- ------------------------------------------------------------------------------------------------------
GOOSE                        TIOXIDE                                  UTILITIES
                                                                      IP Steam
- ------------------------------------------------------------------------------------------------------
GOOSE                        TRACERCO                                 UTILITIES
                                                                     Potable Water
                                                                       LP Steam
- ------------------------------------------------------------------------------------------------------
GOOSE                        TRACERCO                                 ELECTRICITY
                                                                   50 Hz Electricity
- ------------------------------------------------------------------------------------------------------
GOOSE                        EUTECH                                    UTILITIES
                                                                        LP Steam
                                                                     Potable Water
                                                                        Effluent
- ------------------------------------------------------------------------------------------------------
GOOSE                        EUTECH                                   ELECTRICITY
                                                                         50 Hz
- ------------------------------------------------------------------------------------------------------
GOOSE*                       EUTECH                                     SERVICES
                                                                     Site Road System
                                                       Transport of Communications via pipebridges
- ------------------------------------------------------------------------------------------------------
</TABLE> 

Goose        =     The Business
Alpha        =     Amines
Plymouth     =     ICI
*Plymouth Tabs (Supplier)/The Business (Purchaser): Electricity (Electricity 
 50Hz)
<PAGE>
 
                                    ANNEX 2
                                        
                               PROPERTY SCHEDULE
<PAGE>
 
                                   SCHEDULE 1

                                   PROPERTIES

Plymouth   =   ICI
Tango      =   The Purchaser

                              PART 1: DEFINITIONS

In this Schedule the following expressions are used with the following meanings,
namely:-

"Ancillary Property Documents"         means the documents listed in Table A
                                       (relating to the Billingham Property)
                                       Table B (relating to the Severnside
                                       Property) and Table C (relating to the
                                       Stanlow Property)

"Assignment Properties"                means the leasehold properties in respect
                                       of which the Reversioner's consent to
                                       assign is required namely:-

                                       (a)  the Stanlow Property

                                       (b)  the HOC Corridor

                                       (c)  the Frequency Changer House

"Billingham Documents"                 means the Billingham Transfer and such
                                       of the Ancillary Property Documents as
                                       are listed in Table A

"Billingham Property"                  means the Seller's Billingham Property
                                       and Plymouth's Billingham Property

"Billingham Transfer"                  means a transfer of the Billingham
                                       Property in the form of a draft thereof
                                       which is in Agreed Form

"Frequency Changer House"              means the premises demised by a Lease
                                       dated 6th August 1984 made between (1)
                                       North Eastern Electricity Board and (2)
                                       Plymouth

"HOC Corridor"                         means that part of the Billingham
                                       Property comprising the pipe corridor
                                       known as the HOC Corridor (which
                                       comprises the pipe corridor shown edged
                                       red on Plan V4)

"Lease Completion Date"                means the later of:-

                                       (a)  the tenth working day after the
                                            date of the last of the two
                                            Reversioner's licence permitting
                                            the assignment or underletting (as
                                            the case may be) of the relevant
                                            Lease has been granted and a copy
                                            thereof is supplied to the
                                            Purchaser or its Solicitors

                                       (b)  the Completion Date

<PAGE>
 
"Link Corridor"                        means that part of the Billingham
                                       Property comprising part of the
                                       Seller's/Plymouth's Billingham/Wilton
                                       Link being the part edged red on Plan 1.6
                                       attached to the Billingham Transfer

"Plymouth's Billingham Property"       means that part of the property comprised
                                       in the Billingham Transfer which is to be
                                       transferred by Plymouth

"Premises"                             means the premises forming the subject
                                       matter of the Premises Agreements

"Premises Agreements"                  means the aggregate of the following (all
                                       of even date herewith):
 
                                       (a)  an Agreement for Lease made between
                                            the Seller (1) and Tango (2)
                                            relating to the grant by the Seller
                                            to Tango of a Lease of the Ammonia
                                            Storage Facilities at North Tees;
 
                                       (b)  an Agreement made between the Seller
                                            and Plymouth (1) and Tango (2)
                                            relating to the grant by the Seller
                                            and Plymouth to Tango of a Licence
                                            to occupy premises at Wilton Centre;
 
                                       (c)  an Agreement made between Plymouth
                                            (1) and Tango (2) relating to the
                                            grant by Plymouth to Tango of two
                                            Leases at Severnside

"Properties"                           means the aggregate of the Billingham
                                       Property the Severnside Property and the
                                       Stanlow Property

"Property Documents"                   means the aggregate of:-
                                       
                                       (a)  the Property Transfers; and

                                       (b)  the Ancillary Property Documents

"Property Rights"                      means the rights appurtenant (or to be
                                       granted as appurtenant) to the
                                       Properties and Premises to be granted by
                                       the Property Documents

"Property Transfers"                   means the aggregate of:-

                                       (a)  the Billingham Transfer;

                                       (b)  the Severnside Transfer; and

                                       (c)  the Stanlow Assignment

<PAGE>
 
"Reversioner"                          means all persons entitled to the
                                       reversion expectant on the termination of
                                       the relevant Leases under which the
                                       Seller holds the property/premises and
                                       where reference is made in this Agreement
                                       to any licence required from or by the
                                       Reversioner it shall be deemed to mean
                                       all and any such licences where more than
                                       one is required

"Seller's Billingham Property"         means that part of the property comprised
                                       in the Billingham Transfer which is to be
                                       transferred by the Seller

"Severnside Property"                  means the land at Severn Road Severnside
                                       as more particularly described in the
                                       Severnside Transfer

"Severnside Transfer"                  means a Transfer of the Severnside
                                       Property in the form of a draft thereof
                                       which is in Agreed Form

"Stanlow Assignment"                   means the two assignments of the Stanlow
                                       Property in the form of drafts thereof
                                       which are in Agreed Form (including a
                                       Supplemental Deed of Covenant also in
                                       Agreed Form)

"Stanlow Leases"                       means
 
                                       (a)  a Lease dated 4th January 1995 made
                                            between (1) Manchester Ship Canal
                                            Company and (2) the Seller and

                                       (b)  a Lease dated 10th November 1993
                                            made between (1) Moorish Holdings
                                            Limited and (2) the Seller

"Stanlow Property"                     means the premises at Oil Sites Road
                                       Stanlow Cheshire as more particularly
                                       described in the Stanlow Leases together
                                       with the appurtenant rights

"Table A" to "Table E" (inclusive)     means the Tables at the foot of this
                                       Schedule and respectively so lettered

"Underlet Properties"                  means the No. 1 Tees Tunnel demised by a
                                       Lease dated 21st September 1955 made
                                       between (1) The Commissioner for Crown
                                       Lands and (2) Plymouth and any other part
                                       of the Seller's No. 1 Billingham/Wilton
                                       Link over which rights are to be granted
                                       to the Purchaser and a reversioner's
                                       consent thereto is needed

"Volume of Plans"                      means a volume containing various plans
                                       in Agreed Form and reference to a plan by
                                       the letter V followed by a number means
                                       the plan in such Volume so numbered
<PAGE>
 
                   PART II: PROVISIONS RELATING TO PROPERTIES
1.      Completion

(1)  On Completion the Seller and Plymouth (to the extent of their respective
     interests therein) will subject to as stated in this Schedule transfer the
     Properties to the Purchaser by means of assurances which (subject as
     hereinafter provided) will be in the form of the Property Transfers

(2)  The price to be paid for the Properties shall be as stated in Clause 4 of
     this Agreement and apportioned between the several parts of the Properties
     as follows:-

     (a)  to the Seller's Billingham Property FIVE MILLION NINE HUNDRED AND
          NINETY FIVE THOUSAND POUNDS ((Pounds)5,995,000)

     (b)  to the Plymouth Billingham Property FOUR THOUSAND POUNDS
          ((Pounds)4,000)
    
     (c)  to the Severnside Property TWO MILLION POUNDS ((Pounds)2,000,000)

     (d)  to the Stanlow Property ONE THOUSAND POUNDS ((Pounds)1,000)

(3)  The Seller and Plymouth shall not be required or compelled to execute any
     of the Property Transfers:-

     (a) for a consideration greater than that shown in the foregoing paragraph
         1(2); or

     (b) otherwise than in favour of the Purchaser as herein named; or

     (c) in such manner as to transfer any of the Properties otherwise than as a
         single lot

(4)  On Completion the Seller Plymouth and the Purchaser will also enter into
     the Ancillary Property Documents other than the Ancillary Property
     Documents which relate to the Assignment Properties and/or the Underlet
     Properties which will be completed on the Lease Completion Date

(5)  The Property Documents will be entered into in duplicate

(6)  Save in the case of Deeds of Grant in favour of the Seller or Plymouth all
     stamp duty payable in respect of all Property Documents (including the
     duplicates thereof) will be payable by the Purchaser and the Purchaser will
     deliver the duly stamped and denoted duplicates thereof to the Seller
     within 30 days of Completion

(7)  All stamp duty (if any) payable in respect of Deeds of Grant in favour of
     the Seller or Plymouth (including the duplicates thereof) will be payable
     by the Seller or Plymouth and the Seller or Plymouth will deliver the duly
     stamped and denoted duplicates thereof to the Purchaser within 30 days of
     Completion

(8)  If it is not possible to complete any one or more of the Property Documents
     at Completion (other than the Billingham Transfer and the Severnside
     Transfer which shall be completed at Completion in any event) Completion
     shall none the less occur and any of the Ancillary Property Documents
     outstanding at Completion will be completed as soon as reasonably
     practicable thereafter

<PAGE>
 
2.  Form of Billingham Documents

(1)  The agreed forms of the Billingham Documents are based on the assumption
     that:-

     (a)  the Billingham Documents will be completed at Completion; and

     (b)  that at Completion the Seller and Plymouth will collectively own the
          whole of the Retained Land (as so defined in the Billingham Transfer)

(2)  The Purchaser agrees that the Seller and Plymouth shall be entitled to deal
     with any part of the Retained Land (as so defined) prior to Completion
     PROVIDED THAT any such dealings will take effect subject to the rights of
     the Purchaser as comprised in this Schedule and in the Billingham Documents

(3)  The Seller and Plymouth shall only be entitled to require that the
     Billingham Documents be amended such as to secure to the Purchaser the
     Seller and Plymouth the same rights benefits and obligations as would have
     applied had the Billingham Documents been completed in accordance with the
     assumption in paragraph 2(1) above to the intent that matters excepted and
     reserved in the Agreed Form Billingham Transfer may become matters to which
     the Property is subject but that the Billingham Transfer shall otherwise
     remain unamended and such amendments shall be agreed between the respective
     parties or their Solicitors acting reasonably and in default of agreement
     settled by Conveyancing Counsel agreed upon between the parties or (in
     default of such agreement) nominated by the President of the Law Society
     (or his deputy or other person nominated by him to make appointments on his
     behalf) such Counsel to act as an expert and not as an arbitrator PROVIDED
     THAT if any amendment shall not have been agreed or settled by the
     Completion Date the Billingham Transfer shall be completed without such
     amendments in the Agreed Form and in that event the Seller and Plymouth
     will procure that any third parties with whom dealings have taken place
     join in the Billingham Transfer to confirm the grant of any rights or
     otherwise as may be requisite

3.   Adverse Rights

     The Properties are to be transferred and the Ancillary Property Documents
     entered into subject so far as thereby affected to but with the benefit (so
     far as applicable) of all those matters specified contained or referred to
     in the Property Transfers and the Ancillary Property Documents but
     otherwise free from encumbrances and the Purchaser shall be deemed to take
     the Property Transfers and enter into the Ancillary Property Documents with
     full knowledge and notice of such matters and shall not raise any objection
     or requisition whatsoever in relation thereto save for any matters revealed
     by searches of H.M. Land Registry H.M. Land Charges Registry and Companies
     House

4.   Title

     The Seller and Plymouth shall sell the Properties with full title guarantee
     and the Ancillary Property Documents shall be entered into with full title
     guarantee save where otherwise stated in the relevant Agreed Form
<PAGE>
 
5.  Local Land Charges etc.

     The Properties are to be transferred and the Ancillary Property Documents
     entered into subject to such of the following matters as relate thereto:-

     (a)  all Local Land Charges whether registered or not before the date of
          this Agreement and all matters capable of registration as Local Land
          Charges whether or not actually so registered;

     (b)  all notices served and orders, demands, proposals or requirements made
          by any local, public or other competent authority whether before or
          after the date of this Agreement; and

     (c)  all actual or proposed orders, directions, notices or charges,
          restrictions, conditions, agreements, consents, permissions or other
          matters of any kind arising under any legislation including delegated
          legislation;

PROVIDED THAT this Clause shall not in anyway prejudice the Warranties given by
the Seller or Plymouth

6.   Vacant Possession

     The Properties will be transferred with vacant possession save (a) as
     specified in the Property Transfers (b) as regards the Stanlow Property
     which will be transferred subject to the rights of occupation of Air
     Products Limited (c) as regards the occupation by Eutech Engineering
     Solutions Limited at Severnside and Billingham (d) as to huts and compounds
     at Billingham and Severnside used by contractors in relation to current and
     ongoing contracts on the Completion Date and (e) as otherwise disclosed in
     the Disclosure Letter

7.   Insurance

(1)  The Properties shall be at the Seller's and/or Plymouth's risk for
     insurance purposes until Completion

(2)  From the date of this Agreement until Completion ("the said period") the
     Seller and/or Plymouth shall maintain in force (at levels applicable at the
     date hereof) the Seller's and/or Plymouth's existing insurance policies in
     relation to the Properties

8.   Non-merger
     The provisions of this Schedule shall remain in full force and effect
     notwithstanding Completion insofar as they remain to be implemented after
     the date of Completion

9.   National Conditions of Sale

     The National Conditions of Sale (20th Edition) ("National Conditions") as
     published by The Solicitors' Law Stationery Society plc in December 1981
     shall apply (except for Conditions 2,3,4,5,7,9,10, 11(5), 15, 17, 20, 21,
     and 22) insofar as the same are not inconsistent with the terms of this
     Agreement PROVIDED THAT:-

     (a)  references to "vendor" and "purchaser" shall be deemed to be
          references to the Seller and the Purchaser respectively and where any
          rights to be granted affect or benefit 
<PAGE>
 
          the Plymouth Billingham Property or other Property of Plymouth and the
          Purchaser respectively

     (b)  the "prescribed rate" shall be the rate of default interest prevailing
          under this Agreement

     (c)  in National Condition 13(1) the words after the words "such muniments"
          shall be deemed to be deleted

     (d)  in National Condition 16 the reference to the "date of the contract"
          shall be deemed to be a reference to the date when this Agreement
          becomes unconditional

10.  Billingham Transfer

(1)  Paragraph 2 in each of Parts 1 and 2 of Schedules 2 and 3 to the Billingham
     Transfer remain to be completed with details of the:-

     Transferee's C & P Apparatus

     Transferee's ICI Apparatus

     C & P Apparatus

     ICI Apparatus

(all as defined in the Billingham Transfer) which as at the date of this
Agreement have yet to be fully identified)

(2)  Prior to Completion and following Completion the Seller and Plymouth and
     the Purchaser (acting reasonably and with the utmost good faith) will meet
     and agree:-

     (a)  as to the matters referred to in paragraph 10(1) above ("Reserved
          Matters");

     (b)  as to the adjustments to the form of the Billingham Transfer (and the
          plans to be annexed to it) required in the light of the agreement on
          Reserved Matters

(3)  The agreement to be reached on Reserved Matters shall be reached on the
     basis of the apparatus and equipment which belongs to and serves (i) the
     Business (which will comprise Transferee's C & P Apparatus and Transferee's
     ICI Apparatus) and (ii) the businesses of the Seller and Plymouth on the
     Retained Land as defined in the Billingham Transfer (which will comprise
     the C & P Apparatus and the ICI Apparatus) and will be such as to permit:-

     (a)  the Purchaser to make and receive the services necessary to comply
          with the Implementation Agreements (for this purpose construed as
          excluding the clause headed and/or relating to Easements and
          Wayleaves) and the services listed in Table D and Table E; and

     (b)  the Seller and/or Plymouth to maintain supplies required for the
          conduct of its retained business as carried on on the date hereof

(4)  The Billingham Transfer shall be completed on Completion and shall grant
     rights and reserve rights in respect of the Reserved Matters which have
     been agreed as set out in paragraph 10 

<PAGE>
 
     (2) not less than three working days prior to Completion Insofar as the
     Reserved Matters have not been identified prior to the date being three
     working days before Completion the Seller and Plymouth and the Purchaser
     shall continue to act with the utmost good faith in identifying the
     Reserved Matters and in the event that any Reserved Matters are agreed or
     determined under paragraph 12 within the period of one year from the date
     of Completion (time to be of the essence) the parties shall as soon as
     reasonably practicable but not later than two months after the date such
     manner is agreed or determined enter into a Deed whereby the Billingham
     Transfer shall be varied to take account of the Reserved Matters so agreed
     and determined as if they had been so agreed or determined three working
     day before completion

(5)  Where apparatus which would otherwise be C&P Apparatus and/or ICI Apparatus
     is located in the Link Corridor such apparatus shall not be listed in
     Schedule 3 to the Billingham Transfer but will form the "Existing
     Apparatus" for the purposes of the Deeds of Grant which comprise the items
     numbered 1 and 2 in Table A

11.  Determination of Disputes

(1)  Any dispute or difference between the Seller and Plymouth on the one hand
     and the Purchaser on the other hand as to the Reserved Matters and any
     amendments required to the Billingham Transfer and the plans to be attached
     to it in connection with the Reserved Matters shall be resolved by means of
     a reference to an independent person ("Independent Person") appointed in
     accordance with paragraph 11(2) below and either party at any time by
     giving written notice to the other ("Determination Notice") may refer the
     dispute or difference for determination to an Independent Person

(2)  The Independent Person shall be appointed by agreement between the Seller
     and Plymouth on the one hand and the Purchaser on the other hand or if
     within five working days after the service of the Determination Notice they
     are unable to agree then on the application of any of the parties by the
     President for the time being of the Royal Institution of Chartered
     Surveyors or the duly appointed deputy of such President or any other
     person authorised by him to make appointments on his behalf

(3)  The Independent Person to be appointed under this paragraph 11 shall act as
     an expert and the following provisions shall have effect:-

     (a)  the Independent Person shall act as an expert and not as an arbitrator
          and his decision shall be final and binding upon the parties;

     (b)  the Independent Person shall consider (inter alia) any written
          representations and cross-representations and supporting evidence made
          on behalf of the parties (if made reasonably promptly) but shall not
          be bound thereby;

     (c)  the parties shall use all reasonable endeavours to procure that the
          Independent Person shall give his decision as speedily as possible;

     (d)  the costs of appointing the Independent Person and his costs and
          disbursements in connection with his duties hereunder shall be shared
          between the parties in such proportions as the Independent Person
          shall determine or, in the absence of such determination, equally
          between the parties; and
<PAGE>
 
     (e)  if the Independent Person shall be or become unable or unwilling to
          act then the procedure contained in this paragraph 12 for the
          appointment of an Independent Person may be repeated as often as
          necessary until a decision is obtained

12.  Leases and other Documents where Licence to Assign or Sub-let is needed

(1)  Wherever a Licence to Assign or sub-let is required under the terms of a
     Lease or other documents vested in the Seller or Plymouth in order to
     complete the Property Documents the Seller or Plymouth (as the case may be)
     will use all reasonable endeavours to obtain the same as soon as reasonably
     practicable

(2)  The Purchaser will provide such assistance as the Seller or Plymouth may
     reasonably require in regard to such Licences including:-

     (a)  providing such references information and accounts as may be
          reasonably required by the Reversioner; and

     (b)  entering into a direct covenant with and giving or procuring such
          guarantees in favour of the relevant Reversioner to pay the rents
          reserved by the relevant lease and to perform the covenants and other
          obligation of the Tenant therein as the Reversioner shall reasonably
          require but not otherwise

(3)  The Purchaser shall on and from the Completion Date be permitted to enter
     into occupation of the Assignment Properties and to enjoy the rights to be
     demised in respect of the Underlet Properties as licensee of the Seller
     and/or Plymouth and shall be entitled to receive all profit and other
     profit and income from it pending completion of the relevant Property
     Documents and the Seller shall from the Completion Date until the relevant
     Lease Completion Date hold the Assignment Properties on trust for the
     Purchaser

(4)  From the Completion Date until the relevant Lease Completion Date the
     Purchaser shall be responsible for the payment of all outgoings (save for
     any rent or sums payable to the landlord which the Seller and/or Plymouth
     shall continue to pay) for the Assignment Properties and the Seller and/or
     Plymouth shall observe and perform the covenants agreements conditions and
     stipulations on its part to be observed and performed in relation to the
     Assignment Properties

(5)  The following further provisions shall apply in relation to any period of
     occupation of the Assignment Properties prior to completion of the relevant
     assignment/demise to the Purchaser:-

     (a)  the Purchaser shall pay to the Seller a licence fee at the same annual
          rate and on the same date as specified in the document relating to the
          Assignment Properties save in respect of the Stanlow Property where
          the licence fee shall be the sum of (Pounds)23,570 (plus VAT) per
          annum

     (b)  the Purchaser shall not carry out any activity which would constitute
          a breach or non-observance of the covenants and conditions contained
          in the document relating to the Assignment Properties and shall not
          carry out any alterations or other work thereto

     (c)  the Seller and/or Plymouth so far as it is lawfully able to as so
          shall permit the Purchaser to remain in occupation of the Assignment
          Properties
<PAGE>
 
(6)   If any landlord lawfully requested the Seller and/or Plymouth to terminate
      the Purchaser's occupation or serves a writ or summons for possession of
      an Assignment Property upon the Seller and/or Plymouth (as the case may
      be) or the Purchaser on the ground that the Purchaser's occupation
      constitutes a breach of covenant the Purchaser shall vacate the Assignment
      Property and the Seller and/or Plymouth shall operate the Business as
      agent for the Purchaser and shall comply entirely with the Purchaser's
      requirements and instructions

(7)   If the Reversioner's consent to an assignment of the Assignment Properties
      has not been obtained within three months of the Completion Date the
      Seller shall where requested by the Purchaser:-

      (a)  make application to the relevant landlord for a licence to underlet
           the Assignment Property and/or

      (b)  apply to a court of competent jurisdiction for a declaration that the
           landlord is acting unreasonably

(8)   Completion of the assignment/underlease of the Assignment Property shall
      take place on the Lease Completion Date and if the parties shall enter
      into an underlease such underlease shall be for a term equal to the
      unexpired residue of the term of the lease relating to the Assignment
      Property (less 3 days) and shall be on the same terms mutatis mutandis as
      the said lease

13.   Special Conditions of Sale

[(1)] Where any of the Ancillary Property Documents relating to the Billingham
      Property contain a Schedule which remains to be completed as to the
      matters to which the grant is subject there shall be listed therein such
      of the documents referred to in the Disclosure Letter as relate to the
      land identified on the relevant plan

[(2)] In Table A to the Schedule a note is to be inserted to preserve for 5
      years the right to build a 16" gas line referred to the proviso to
      paragraph 1 of Schedule 2 to the draft Deed of Grant (Corridor Deed -
      Existing and New pipelines) on the same terms as in such draft deed

(3)   In Schedule 1 to Business Sale Agreement Tables D & E to be verified by
      Purchaser as comprising requirements of Implementation Agreements and
      receipt of supplies
                          A: AS TO BILLINGHAM PROPERTY
1.  Licences from THPA and Crown
- --  ----------------------------
(1)  In this paragraph 1 "Licences" means:-
     (i)  a Licence dated 16th June 1997 made between The Tees and Hartlepool
          Port Authority ("THPA") (1) and the Seller (2)
     (ii) a Licence dated 17th June 1977 made between The Queen's Most Excellent
          Majesty (1) the Crown Estate Commissioners ("CEC") (2) THPA (3) and
          Imperial Chemical Industries Limited (4) (as varied by Deed dated 17th
          November 1986 not affecting the Business)
<PAGE>
 
     (iii) a Licence dated 15th October 1990 made between CEC (1) THPA (2) and
           Plymouth (3)

(2)  The Licences relate to (inter alia):-

     (a)   a 78" and a 66" Outfall at Billingham Reach; and

     (b)   Bamletts Wharf

     ("the Facilities") and are non-assignable.

(3)  Plymouth the Seller and the Purchaser will use all reasonable endeavours to
     obtain prior to completion new Licences (from CEC and THPA) in relation to
     the Facilities ("New Licences") whereupon the Seller and Plymouth will
     surrender the Licences in so far as (and only in so far as) they relate to
     the Facilities.  The Seller will provide such information as it is able to
     assist the Purchaser in negotiating the Licence fees payable to CEC and
     THPA in respect of the Facilities but settlement of the amount thereof (and
     its subsequent payment) shall be agreed between the Purchaser CEC and THPA
     (as to which the Purchaser will act reasonably)

(4)  If the New Licences have not been obtained prior to completion Plymouth and
     the Seller will hold the Licences on trust for the Purchaser (as regards
     the Facilities) and Plymouth and the Seller (as regards all other works
     affected thereby) shall jointly permit the Purchaser to use the Facilities
     as sub-licensee of the Seller or Plymouth (as the case may be)

(5)  The Purchaser will comply with the terms of the Licence so far as they
     relate to the Facilities and not do anything (other than using the
     Facilities) which may expose Plymouth or the Seller to liability for breach
     thereof

(6)  If CEC or THPA require the Purchaser to cease using the Facilities the
     Seller and/or Plymouth will operate the same (at the Purchaser's cost and
     as the Purchaser's agent) pending grant of the New Licences

(7)  If the New Licences have not been granted within one year of the Date of
     Completion the Seller will (if so required by the Purchaser) repurchase
     from the Purchaser the property secondly described in Part 1 of Schedule 1
     to the Billingham Transfer and operate Bamletts Wharf and the above
     mentioned Outfalls in like manner as heretofore and the Purchaser and the
     Seller will enter into a Services Agreement whereby the Seller undertakes
     to operate the Facilities on the same terms as the relevant Implementation
     Agreement relating to the Facilities with the Seller and/or Plymouth named
     as the service provider and the Purchaser as the customer  The price to be
     paid by the Seller for the said land shall be:-

                                 A
                         (Pounds)--x (Pounds)6,000,000
                                 B
     where

     A is the acreage of the land repurchased and

     B is the total acreage comprised in the Billingham Transfer
<PAGE>
 
3.   Street Works Consents

(1)  The Seller confirms that all licences required from any relevant Highway
     Authority with regard to any pipelines or cables crossing public highways
     have been obtained.  So far as permissible the Seller will:-

     (a)  where the licence or permit concerned relates solely to apparatus to
          be vested in the Purchaser assign such Licences to the Purchaser; and

     (b)  where such licences relate to apparatus to be vested in the Purchaser
          and to be retained by the Seller/Plymouth either grant a sub-licence
          of the relevant rights to the Purchaser or (if that is not possible)
          hold the relevant licence or permit upon trust for the Seller and/or
          Plymouth and the Purchaser jointly

(2)  The arrangement set out in sub-paragraph (1) will apply until such times as
     the Purchaser obtains new licences or permits from the relevant Highway
     Authority.

4.   Statutory Declarations

(1)  The Seller will provide (in a form reasonably acceptable to the Purchaser
     and prior to Completion) two Statutory Declarations as follows:-

     (a)  a Statutory Declaration to the effect that the Billingham Property has
          been owned by the Seller or Plymouth (as the case may be) and occupied
          by them for a period in excess of 12 years without payment to any
          third party of any rent or other acknowledgement and otherwise than
          pursuant to any consent issued by a third party;

     (b)  a Statutory Declaration to the effect that the various parcels of land
          so identified in the Deeds referred to in the Disclosure Letter and
          relate to the pipe corridor running between the Billingham Property
          and the Nylon Plant at Wilton owned by DuPont plc form a continuous
          corridor broken only by road and rail crossings

5.   Land Registry Requirements

(1)  The Seller and/or Plymouth will use all reasonable endeavours to locate and
     supply to the Purchaser copies of:-

     (a)  any conveyances or other documents referred to in the title
          documentation relating to the Billingham Property where copies of such
          documents have not already been provided to the Purchaser; and

     (b)  the conveyances and other documents Memoranda whereof are endorsed
          upon the Seller's/Plymouth's title deeds.

(2)  The Seller and/or Plymouth will provide to the Purchaser at their own cost
     and expense all reasonable assistance required by the Purchaser in securing
     registration with Title Absolute at H M Land Registry of the Purchaser's
     freehold interest in the Billingham Property.

(3)  On Completion the Seller and Plymouth will provide to the Purchaser at
     their own cost a certified copy of a letter dated 22nd February 1988 from
     H.M. Land Registry together with the written confirmation referred to
     therein
<PAGE>
 
6.   Railtrack Plc

In respect of such of the apparatus of the Purchaser as crosses railways vested
in Railtrack Plc the Seller will grant by sub-demise to the Purchaser such
rights as the Seller is able to demise pursuant to the combined effect of a
Lease dated 13th March 1951 made between British Transport Commission (1) and
Imperial Chemical Industries (2) and a further Lease dated 7th July 1966 made
between British Railways Board (1) and Imperial Chemical Industries Limited (2)

7.   Lorry Park adjoining Portrack Site

At Completion (if so requested) the Seller will grant to the Purchaser for a
period not exceeding one year a non-exclusive licence free of charge for the
parking of lorries in the lorry park adjoining the entrance to Portrack Site
(edged red on Plan 3 attached to the Billingham Transfer)

                         B: AS TO SEVERNSIDE PROPERTY

1.   New Leases from Zeneca

As soon as practicable following the date of this Agreement Plymouth will call
upon ZENECA Limited ("ZENECA") to grant to the Purchaser Leases in favour of the
Purchaser in accordance with the Clauses numbered 8 contained in two Leases each
dated 18th December 1992 and made between ZENECA (1) and Plymouth (2) and
Plymouth and the Purchaser will:-

(a)  procure that such Leases are granted to the Purchaser; and

(b)  use all reasonable endeavours to procure that such Leases are granted on
     Completion

and if such Leases have not been granted at Completion then Purchaser shall be
entitled to occupy the premises concerned on like terms (mutatis mutandis) to
those set out at paragraph 13 above

2.   1962 Bridge Lease

The parties will following the date of this Agreement use their reasonable
endeavours to obtain the consent of the Landlord of a Lease ("the Lease") dated
5th April 1962 made between the British Transport Commission (1) Imperial
Chemical Industries Limited (2) (relating to an easement to construct a bridge
under a railway) to a subletting in favour of the Purchaser in the following
terms.  If consent is received the format of the sublease will be:-

(1)  The sublessee will be granted a right to use the roadway (as referred to in
     the Lease) in common with Plymouth and all persons thereafter authorised so
     to do by Plymouth with or without vehicles for the purposes only (insofar
     as the sublessee is concerned) of gaining access to the foreshore to
     undertake repairs, maintenance and renewal of the effluent pipelines (such
     pipelines being the subject of a Deed of Grant to be entered into between
     Plymouth (1) the Purchaser (2) on Completion)

(2)  The sublessee will be granted a right to maintain in position the bridge
     (as referred to in the Lease)
<PAGE>
 
(3)  The term of the sublease will be for the residue of the unexpired term of
     the Lease less the last three days thereof

(4)  The sublessee will take all necessary steps to prevent the acquisition of
     any public or private rights of way or easements

(5)  The sublessee will contribute to all costs incurred by Plymouth pursuant to
     Plymouth's obligations under the Lease (for the avoidance of doubt to
     include sums incurred pursuant to clauses 2(6) and 3(5) but not any costs
     relating to or consequent upon the construction of the bridge and roadway)
     such proportion to be established by Plymouth (as lessor) acting reasonably
     on a user basis

(6)  The sublessee will permit inspection of the bridge over the roadway by
     Plymouth (as lessor)

(7)  The sublessee will not make any alterations or additions whatsoever

(8)  The sublessee will covenant to repair and maintain the bridge and roadway
     (both as referred to in the Lease) in a good and substantial condition and
     Plymouth (as lessor) will contribute to the balance of the proper costs
     thereby incurred on a user basis as determined by the sublessee (acting
     reasonably), after any contribution by the landlord of the Lease has been
     taken into account (which shall be due to the sublessee)

(9)  The sublessee will contribute a proportion of all costs which are to be met
     by the lessee of the Lease (including for the avoidance of doubt rent due
     and sums due pursuant to clauses 2(5), 2(8), 2(9), 3(1) and 3(2) but not
     any costs relating to or consequent upon the construction of the bridge and
     roadway) such proportion to be established by Plymouth (acting reasonably)
     on a user basis

(10) The sublessee will indemnify Plymouth (as lessor) against any claim or
     demand by the Head Lessor pursuant to the Lease arising out of any act
     omission or negligence of the sublessee or any breach of the sublessee's
     obligations in this sublease and will observe and perform all the covenants
     and conditions of the Lease (save as to payment of sums due thereunder)

(11) Not to assign charge sublet or deal with the sublease in any way save for
     an assignment of the whole to a party taking a simultaneous transfer of the
     Property under the Transfer and then only with the prior written consent of
     the landlord under the Lease and of Plymouth

(12) The sublease shall contain provisos in the form of clauses 3(3) and 3(5) of
     the Lease (mutatis mutandis)

(13) The sublease shall contain on the part of the sublessee a covenant with
     Plymouth in the form (mutatis mutandis) of clause 2(10) of the Lease.

(14) The sublease shall contain provisions for reference to an arbitrator if the
     parties cannot agree the proportion payable under any of the forgoing
     provisions, the decision of such arbitrator to be final and binding on the
     parties and his costs shall be within his award

3.   Schedule of Condition re Main Stores
<PAGE>
 
The parties will act reasonably in agreeing a photographic schedule of condition
detailing the present condition of the building known as Main Stores, Central
Avenue which is to be the subject of a lease between Plymouth and the Purchaser
on Completion. Such schedule shall be agreed within a reasonable time of the
date of this Agreement (and in any event before Completion) Provided that in the
event of disagreement all photographs taken shall be included in the Schedule

4.   Statutory Declaration

Plymouth will provide to the Purchaser a Statutory Declaration (in a form
reasonably acceptable to the Purchaser) in respect of Plymouth's use of the
southern access road under the A403 (used in connection with access to the
foreshore) and in relation to the effluent mains which lie under the Severn
Road. Both Statutory Declarations to relate to a period in excess of twelve
years

5.   Rosier Tankers Limited Occupation

(1)  Plymouth will use its reasonable endeavours opposite Rosier Tankers
     Limited, company number 2295236, (previously known as Chemic-Haul Limited)
     before Completion either to:-

     (i)  obtain vacant possession of the premises currently occupied by Rosier
          Tankers Limited; or

     (ii) enter into a new lease with Rosier Tankers Limited for a term of three
          years (being contracted out of the provisions of sections 24 to 28
          inclusive of the Landlord and Tenant Act 1954, (as amended) and such
          contractual provision being authorised by Court order) such lease to
          be on terms approved by the Purchaser (such approval not to be
          unreasonably withheld) and to include a break clause in favour of the
          Landlord on six months' notice given at any time

     PROVIDED THAT Plymouth's reasonable endeavours will not involve payment of
     a sum exceeding FORTY-TWO THOUSAND POUNDS ((Pounds)42,000)

(2)  If on Completion Plymouth have not achieved either vacant possession or a
     new lease as detailed in 5(1) above Plymouth will pay to the Purchaser on
     Completion the sum of FORTY-TWO THOUSAND POUNDS ((Pounds)42,000) by way of
     compensation

                           C: AS TO STANLOW PROPERTY

1.   Occupation Pending Completion

The Purchaser shall be entitled to enter into occupation of the Stanlow Property
from the Completion Date until the Lease Completion Date (if later)

2.   Dispute re Lease

(1)  The Seller shall diligently pursue to determination the proceedings issued
     by Aubrey Weis in the High Court of Justice Chancery Division Case Number
     CH1996 W5659 and shall use all reasonable endeavours to procure the dispute
     referred to therein is determined as soon as reasonably practicable

(2)  If the Purchaser shall be joined as a third party into the proceedings
     referred to in Clause 2(1) above or any proceedings shall be issued or
     threatened against it arising out of such
<PAGE>
 
     proceedings or the non-payment of rent under the Stanlow Lease dated 10th
     November 1993 the Seller will indemnify the Purchaser in respect of all
     costs claims and expenses incurred by the Purchaser in connection therewith
     (including interest on rent paid after the due date)

3.   6" Water Main

The Seller will use all reasonable endeavours prior to Completion (but not
thereafter) to procure:-

(a)  the grant from the Manchester Ship Canal Company ("MSC") and Ellesmere Port
     and Neston Borough Council of a demise of the 6" water main and associated
     rights for a term of 21 years from 25th December 1989 in a form reasonably
     acceptable to the Purchaser; and

(b)  a statutory declaration from MSC as to the title to grant such demise in a
     form reasonably acceptable to the Purchaser

and will also deliver at Completion a statutory declaration by the Seller (as to
the maintenance in position and use of the said 6" water main for a period in
excess of twenty years) in a form reasonably acceptable to the Purchaser

4.   Agreement dated 23rd December 1993

The Purchaser will co-operate with the Seller at the Seller's cost in connection
with the Seller's discussions with Shell UK Limited concerning the payment of
rates to Shell UK Limited under an Agreement dated 23rd December 1993 made
between (1) Shell UK Limited and (2) the Seller and in the event that any sum is
payable to the Purchaser in respect of rates for the period prior to the
Completion Date the Purchaser shall pay such sum to the Seller

5.   Air Products plc

The Seller shall not without the consent of the Purchaser grant a lease/licence
or other property right to Air Products plc
<PAGE>
 
                                      113


                                    TABLE A
                  Ancillary Property Documents re Billingham
                                        
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
No.    Document            Parties                          Description                                    Comment
- ------------------------------------------------------------------------------------------------------------------------------------
<C> <S>                 <C>                   <C>                                           <C>
1.  Deed of Grant       Purchaser (1)         Deed of Grant to Seller of easements over     (1)  Agreed Form
                        Seller (2)            the Link Corridor                             (2)  Plan per Plan 1 in Volume of
                                                                                                    Plans
- ------------------------------------------------------------------------------------------------------------------------------------
2.  Deed of Grant       Purchaser (1)         Deed of Grant to Plymouth of easements        (1)  In like form to 1 above (mutatis
                        Plymouth (2)          over the Link Corridor                             mutandis but for new pipes etc
                                                                                                 only (not existing pipes)
                                                                                            (2)  Plan per Plan 2 in Volume of
                                                                                                 Plans
- ------------------------------------------------------------------------------------------------------------------------------------
3.  Deed of Grant       Purchaser (1)         Deed of Grant to Seller of easements over     (1)  In like form to 1 above (mutatis
                        Seller (2)            the HOC Corridor                                   mutandis)
                                                                                            (2)  Plan per Plan 3 in Volume of
                                                                                                 Plans
- ------------------------------------------------------------------------------------------------------------------------------------
4.  Deed of Grant       Purchaser (1)         Deed of Grant to Plymouth of easements        (1)  In like form to 1 above (mutatis
                        Plymouth (2)          over the HOC Corridor                              mutandis)
                                                                                            (2)  Plan per Plan 4 in Volume of
                                                                                                 Plans
- ------------------------------------------------------------------------------------------------------------------------------------
5.  Deed of Grant       Seller (1)            Deed of Grant to Purchaser of easements       (1)  In like form to 1 above (but
                        Purchaser (2)         for ammonia pipelines to North Tees                excluding the right to lay new
                                                                                                 pipes etc.)
                                                                                            (2)  Plan per Plan 5 in Volume of
                                                                                                 Plans
- ------------------------------------------------------------------------------------------------------------------------------------
6.  Deed of Grant       Seller (1)            Deed of Grant to Purchaser of easements       (1)  In like form to 1 above (but
                        Purchaser (2)         for ammonia pipeline to Wilton                     excluding the right to lay new
                                                                                                 pipes etc.)
                                                                                            (2)  Easements to be demised where
                                                                                                 the Seller/Plymouth has a
                                                                                                 term of years
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 
<PAGE>

                                     114 
<TABLE>
<CAPTION> 
====================================================================================================================================
<C>   <S>                        <C>                    <C>
7.    Deed of Grant              Seller (1)             Deed of Grant to Purchaser of easements 
                                 Purchaser (2)          for that part of the Nitrogen Pipeline (to
                                                        BOC at Teesport) lying in the Seller's
                                                        retained land at Billingham
 
- ------------------------------------------------------------------------------------------------------------------------------------
8.    Assignment                 Seller (1)             Assignment of Pipe Corridor Easements in
                                 Purchaser (2)          Deed dated 10th March 1970 above
                                                        referred to 
- ------------------------------------------------------------------------------------------------------------------------------------
9.    Assignment                 Seller(1)              Assignment of Lease of Frequency
                                 Purchaser (2)          Changer House dated 6th August 1984
                                                        above referred to
- ------------------------------------------------------------------------------------------------------------------------------------
10.   Deed of Grant              Seller (1)             Deed of Grant to Purchaser of `De-
                                 Purchaser (2)          Landlock' Corridor Easements
- ------------------------------------------------------------------------------------------------------------------------------------
11.   Deed of Grant              Purchaser (1)          Deed of Grant to Seller of `De-Landlock'
                                 Seller (2)             Corridor Easements
- ------------------------------------------------------------------------------------------------------------------------------------
12.   Deed of Grant              Purchaser (1)          Deed of Grant to Plymouth of `De-
                                 Plymouth (2)           Landlock' Corridor Easements
- ------------------------------------------------------------------------------------------------------------------------------------
13.   Deed of Grant              Seller (1)             Deed of Grant to Purchaser of rights for:-
                                 Purchaser (2)
                                                        (a)  a natural gas pipeline (max 12"
                                                             external diameter); and
 
                                                        (b)  a liquids pipeline (max 6" external
                                                             diameter)

                                                             from the Link Corridor to (but not to 
====================================================================================================================================
</TABLE> 
=============================================
      only)
(3)   Plan per Plan 6 in Volume of Plans
- ---------------------------------------------
(1)   Per 1 above
(2)   Plan per Plan 7 in Volume of Plans

- ---------------------------------------------
Agreed Form

- ---------------------------------------------
Agreed Form

- ---------------------------------------------
(1)   Agreed Form
(2)   Plan per Plan 8 in Volume of Plans

- ---------------------------------------------
(1)   In like form to 10 above (mutatis
      mutandis)
(2)   Plan per Plan 10 in Volume of Plans

- ---------------------------------------------
(1)   In like form to 10 above (mutatis
      mutandis)
(2)   Plan per Plan 11 in Volume of Plans

- ---------------------------------------------
(1)   Like form to 5 above - but for new
      (as opposed to existing pipelines)

(2)   Grant to the extent of Seller's rights
      only in BASF and THPA pipe 
      corridor where easements only are
      held by Seller) In BASF Land the
      Seller's rights expire 27/10/70


=============================================
<PAGE>

                                      115
<TABLE> 
<CAPTION> 
====================================================================================================================================
                                                          include) Seller's No. 2 Tees Tunnel Head 
                                                          House on North Bank of Tees via
                                                          Billingham/Wilton Link
====================================================================================================================================

                                    TABLE B
                  Ancillary Property Documents re Severnside
                                        
====================================================================================================================================
No.  Document               Parties                 Description
- ------------------------------------------------------------------------------------------------------------------------------------
<C>  <S>                    <C>            <C>
1.   Licence                Plymouth (1)            Licence for Lighting Tower
                            Purchaser (2)
- ------------------------------------------------------------------------------------------------------------------------------------
2.   Agreement              Plymouth (1)            Agreement re Railway Sidings
                            Purchaser (2)
- ------------------------------------------------------------------------------------------------------------------------------------
3.   Six Deeds of Grant     Plymouth (1)            Deeds of Grant to Purchaser for rights re pipelines for IP Steam,
                            Purchaser (2)           Firefighting Water, Sharpness Water, Potable Water, Gas and Effluent
- ------------------------------------------------------------------------------------------------------------------------------------
4.   Deed of Grant          Plymouth (1)            Deed of Grant for Cables
                            Purchaser (2)
====================================================================================================================================
</TABLE>
                                    TABLE C
                         ANCILLARY PROPERTY DOCUMENTS
                                  re STANLOW
                                        
<TABLE>
<CAPTION> 
- ------------------------------------------------------------------------------------------------------------------------------------
<C>  <S>                    <C>                     <C>
1.   Assignment             Seller (1)              Assignment of rights re CO2 Pipeline
                            Purchaser (2)
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>
 
<TABLE>


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

- --------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------
2.  Assignment        Seller (1)        Assignment of Agreement with Briti`sh Railways Board
                      Purchaser (2)     dated 20th December 1976
- --------------------------------------------------------------------------------------------

NOTE: All of the documents in Tables B and C above are in Agreed Form









- -------------------------------------------------------------------------------------
</TABLE>
<PAGE>
 
                                    TABLE D
                                TERRA TO SUPPLY
                                        
<TABLE>
<CAPTION>
=================================================================================================
Product                               Amines &                 Acrylics                Methanol
                                      Derivatives                                      Business
- -------------------------------------------------------------------------------------------------
<S>                                   <C>                      <C>                     <C>
LP Steam                               X                       X                       X
- -------------------------------------------------------------------------------------------------
IP Steam                               X                                               X
- -------------------------------------------------------------------------------------------------
HP Steam                               X
- -------------------------------------------------------------------------------------------------
Tees Valley Water                      X                       X                       X
- -------------------------------------------------------------------------------------------------
Gately Water                           X                       X                       X
- -------------------------------------------------------------------------------------------------
Fire Water                             X                       X                       X
- -------------------------------------------------------------------------------------------------
Demineralised Water                                            X                       X
- -------------------------------------------------------------------------------------------------
Nitrogen                               X                       X                       X
- -------------------------------------------------------------------------------------------------
Effluent                               X                       X                       X
- -------------------------------------------------------------------------------------------------
Natural Gas                            X                       X                       X
- -------------------------------------------------------------------------------------------------
Propane                                                                                X
- -------------------------------------------------------------------------------------------------
50Hz Electricity                       X                                               X
- -------------------------------------------------------------------------------------------------
40Hz Electricity                       X
- -------------------------------------------------------------------------------------------------
Condensate                             X
=================================================================================================
</TABLE> 
<PAGE>
 
                                    TABLE E

                               TERRA OBTAIN FROM
                                        
Teeside Utilities Business

Raw Water

Nitrogen

Methanol Business

LP Steam

IP Steam

Instrument Air

Acrylics (Cassel Works)

IP Steam Grade 1 and 2

                    SUPPLIED TO AMONIA STORAGE AT NORTH TEES
                                        
Nitrogen

Electricity

Compressed Air
<PAGE>
 
                                    ANNEX 3

                              PROPERTY WARRANTIES

                                 G. PROPERTIES

(1)  The Properties the Premises and the Property Rights together constitute all
     the freehold or leasehold or other immovable property and rights in
     immovable property owned or occupied or used by the Seller for the purposes
     of the Business.

(2)  The Seller has good and marketable title to the Properties the Premises and
     the Property Rights.

(3)  The Property Rights comprise all the easements rights and licences owned
     occupied or used by the Seller or the Seller's Group on the date hereof in
     connection with the Business and/or necessary in order to enable the
     Purchaser to comply with its obligations in the Implementation Agreements
     (construed for the purposes of this paragraph (3) only as if the Clause
     headed Easements and Wayleaves were excluded therefrom).  No further
     easements rights and licences are required in order to conduct the Business
     in the manner in which it has heretofore been conducted and in accordance
     with statutory requirements and all subsisting governmental and regulatory
     authorisations licences permits and consents.

(4)  Where any pipelines run under over or through any public highways waterways
     or rivers or any property owned by Railtrack plc the pipelines are lawfully
     in such positions and the Seller has the benefit of a lease or
     licence/consent not involving excessive payment or onerous obligations from
     Railtrack plc, any local highway authority, British Waterways Board or any
     River Authority or their predecessors in title.

(5)  The Seller and/or Plymouth have duly performed, observed and complied with
     all material covenants, restrictions, reservations, conditions, agreements,
     statutory and common law requirements, by-laws, orders, building
     regulations and other stipulations and regulations affecting the Properties
     and the Premises and the uses of the Properties and the Premises and no
     lease is liable to be forfeited and all rent and other sums due are paid up
     to date.

(6)  The existing use of each of the Properties the Premises and the Property
     Rights is the lawful permitted use whether under the current Town and
     County Planning legislation and is not a temporary use and all necessary
     consents to such existing use have been obtained.

(7)  All development carried out on the Properties the Premises and the Property
     Rights has been and is lawful and all necessary consents and permissions
     have been or are being obtained for such development.

(8)  The consents and permissions referred to in paragraphs (6) and (7) are
     valid, subsisting and unimpeachable and are not temporary or suspended and
     are also either unconditional or subject only to conditions which have been
     satisfied and no planning permission remains unimplemented (whether in
     whole or in part) nor has any planning application been submitted which
     awaits determination.

(9)  Neither the Properties the Premises or the Property Rights are subject to
     or affected by any Agreements made pursuant to S.106 of the Town and
     Country Planning Act 1990 Section 33 


<PAGE>
 
     of the Local Government (Miscellaneous Provisions) Act 1982 Section 278 of
     the Highways Act 1980 Section 104 of the Water Industry Act 1991 or any
     similar legislation whether or not currently in force.

(10) All relevant matters affecting the Properties the Premises and the Property
     Rights or the use or value thereof or any proposals relating thereto and
     full details of all leases have been disclosed in writing to the Purchaser
     or its Solicitors prior to the date hereof.

(11) The replies given to the enquiries and requisitions concerning the
     Properties the Premises and the Property Rights made by the Purchaser's
     Solicitors and all disclosures are true and accurate in all material
     respects.

(12) All the information produced to or given in writing to the Purchaser or the
     Purchaser's Solicitors in respect of or relating to the Properties the
     Premises and the Property Rights is true and accurate.

(13) The Seller has complied with its obligations under the Fire Precautions Act
     1971 and has applied for and obtained fire certificates thereunder in
     respect of all the Properties the Premises and the Property Rights to the
     extent required by such Act.

(14) The Office Copy Entries of Title No. AV220591 dated 22nd September 1994
     reveal all matters affecting and benefitting the Severnside Property and no
     rights or easements have been granted or covenants created which affect the
     Severnside Property since 22nd September 1994.

(15) The conveyances and other documents referred to in any memoranda endorsed
     on the Billingham Documents (here meaning any conveyance or documents of
     title relating to the Billingham Property referred to in the Disclosure
     Letter) does not relate to a sale of any part of the Billingham Property.
     The Seller and Plymouth are not aware of any rights created or covenants
     imposed by such conveyances or documents referred to in the said memoranda
     which affect the Billingham Property nor have they received notice of any
     claim to any such rights.

(16) Any conveyances deeds or documents referred to in the Billingham Documents
     but not comprised in the Billingham Documents do not create any rights or
     impose any covenants which affect the Billingham Property and neither the
     Seller nor Plymouth are aware of any claims made to any such rights.

(17) The Seller and/or Plymouth has a good and marketable title sufficient to
     enable it to grant to the Purchaser a right as to part in perpetuity and as
     to the remainder for a period expiring in the year 2070 over the land
     between the Billingham Property and the Seller's No. 2 Head House on the
     North Bank of the River Tees (but not including that Head House and other
     than which such route crosses public highways or railways) to lay a pipe of
     up to 16" diameter and thereafter inspect maintain and repair the same free
     from any encumbrances which shall prevent the laying operation maintenance
     and repair of the same.

(18) Notwithstanding the disclosure of the title documents relating to the route
     of the Ammonia Pipeline the Seller has good and marketable title to the
     unregistered part of site ACP No. 616 held by virtue of the conveyance of
     easements and facilities dated 1st January 1988 made between Plymouth (1)
     the Seller (2) and that Plymouth had good and marketable title 


<PAGE>
 
     demonstrated by a good root of title at the date of the said conveyance
     free from encumbrances other than those disclosed in the Disclosure Letter.

<PAGE>
 
SIGNED by J.K. REYNOLDS             )
for and on behalf of                )    J. K. REYNOLDS
ICI CHEMICALS & POLYMERS LIMITED    )    ....................................

 
SIGNED by G.H. VALENTINE            )
for and on behalf of                )    G.H. VALENTINE
TERRA INDUSTRIES LIMITED            )    ....................................
 

SIGNED by R.W.R. CARTER             )
for and on behalf of                )    R.W.R. CARTER
IMPERIAL CHEMICAL INDUSTRIES PLC    )    ....................................

 
SIGNED by B.M. JOYCE                )
for and on behalf of                )    B.M. JOYCE
TERRA INDUSTRIES INC.               )    ....................................
 

<PAGE>

                                                                       EXHIBIT 4

                                                                [Conformed Copy]

================================================================================

                     AMENDED AND RESTATED CREDIT AGREEMENT

                         dated as of December 31, 1997

                                     among

                              TERRA CAPITAL, INC.

                                      and

                     TERRA NITROGEN, LIMITED PARTNERSHIP,

                                 as Borrowers

                              CERTAIN GUARANTORS

                                CERTAIN LENDERS

                             CERTAIN ISSUING BANKS

                                      and

                                CITIBANK, N.A.,
                            as Administrative Agent

================================================================================
<PAGE>
 
                               TABLE OF CONTENTS

          This Table of Contents is not part of the Agreement to which it is
attached but is inserted for convenience of reference only.

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
                                   ARTICLE I
                        DEFINITIONS AND ACCOUNTING TERMS

<S>                                                                         <C>
     Section 1.01. Certain Defined Terms....................................   2
     Section 1.02. Computation of Time Periods..............................  45
     Section 1.03. Accounting Terms.........................................  45

                                   ARTICLE II
                       AMOUNTS AND TERMS OF THE ADVANCES
                           AND THE LETTERS OF CREDIT

     Section 2.01. The Advances.............................................  46
     Section 2.02. Making the Advances......................................  50
     Section 2.03. Repayment................................................  52
     Section 2.04. Termination or Reduction of the
                    Commitments.............................................  52
     Section 2.05. Prepayments, Etc.........................................  53
     Section 2.06. Interest.................................................  56
     Section 2.07. Fees.....................................................  57
     Section 2.08. Conversion and Continuation of Advances..................  58
     Section 2.09. Increased Costs, Illegality, Etc.........................  59
     Section 2.10. Payments and Computations................................  62
     Section 2.11. Taxes....................................................  64
     Section 2.12. Sharing of Payments, Etc.................................  66
     Section 2.13. Letters of Credit........................................  67
     Section 2.14. Replacement of Lender....................................  73

                                  ARTICLE III
                             CONDITIONS OF LENDING

     Section 3.01. Conditions Precedent to Amendment and
                    Restatement.............................................  75
     Section 3.02. Conditions Precedent to Each Borrowing
                    and Issuance............................................  78
     Section 3.03. Determinations Under Section 3.01........................  79

                                   ARTICLE IV
                         REPRESENTATIONS AND WARRANTIES

     Section 4.01. Representations and Warranties of the
                    Company.................................................  79
     Section 4.02. Representations and Warranties of each
                    Lender..................................................  86
</TABLE>

                                      (i)
<PAGE>

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----

                                   ARTICLE V
                               COVENANTS OF TERRA

<S>                                                                         <C>
     Section 5.01. Affirmative Covenants....................................  86
     Section 5.02. Negative Covenants.......................................  95
     Section 5.03. Reporting Requirements................................... 112
     Section 5.04. Financial Covenants...................................... 116

                                   ARTICLE VI
                               EVENTS OF DEFAULT

     Section 6.01. Events of Default........................................ 117
     Section 6.02. Actions in Respect of the Letters of
                    Credit Upon Default..................................... 121

                                  ARTICLE VII
                            THE ADMINISTRATIVE AGENT

     Section 7.01. Authorization and Action................................. 122
     Section 7.02. Administrative Agent's Reliance, Etc..................... 122
     Section 7.03. Citibank and Affiliates.................................. 123
     Section 7.04. Lender Credit Decision................................... 123
     Section 7.05. Indemnification.......................................... 124
     Section 7.06. Collateral Duties........................................ 124
     Section 7.07. Successor Administrative Agent........................... 125

                                  ARTICLE VIII
                                 THE GUARANTEE

     Section 8.01. The Guarantee............................................ 126
     Section 8.02. Obligations Unconditional................................ 127
     Section 8.03. Reinstatement............................................ 128
     Section 8.04. Subrogation.............................................. 129
     Section 8.05. Remedies................................................. 129
     Section 8.06. Instrument for the Payment of Money...................... 129
     Section 8.07. Continuing Guarantee..................................... 129
     Section 8.08. Rights of Contribution................................... 130
     Section 8.09. General Limitation on Guarantee
                    Obligations............................................. 131

                                   ARTICLE IX
                                 MISCELLANEOUS

     Section 9.01. Amendments, Consents, Etc................................ 131
     Section 9.02. Notices, Etc............................................. 133
     Section 9.03. No Waiver; Remedies...................................... 134
     Section 9.04. Costs, Expenses and Indemnification...................... 135
     Section 9.05. Right of Setoff.......................................... 136
     Section 9.06. Governing Law; Submission to
                    Jurisdiction............................................ 137
     Section 9.07. Assignments and Participations........................... 137
</TABLE>
 
                                      (ii)
<PAGE>
 
<TABLE>

<S>                                                                          <C>
     Section 9.08. Execution in Counterparts................................ 142
     Section 9.09. No Liability of the Issuing Banks........................ 142
     Section 9.10. Confidentiality.......................................... 142
     Section 9.11. WAIVER OF JURY TRIAL..................................... 143
     Section 9.12. Survival................................................. 143
     Section 9.13. Captions................................................. 143
     Section 9.14. Successors and Assigns................................... 143
     Section 9.15. NationsBank Assignments.................................. 144
</TABLE>

                                   SCHEDULES
                                   ---------

SCHEDULE 2.01           List of Commitments and Lending
                         Offices
SCHEDULE 4.01(b)        Subsidiaries
SCHEDULE 4.01(c)        List of Conflicts with Credit Instruments
SCHEDULE 4.01(d)        List of Required Authorizations, Consents
SCHEDULE 4.01(j)        Plans and Multiemployer Plans
SCHEDULE 4.01(q)        Environmental Compliance Schedule
SCHEDULE 4.01(u)        Open Tax Years
SCHEDULE 4.01(y)        Existing Debt
SCHEDULE 5.02(a)(iii)   Existing Liens
SCHEDULE 5.02(c)        Existing Hedge Agreements
SCHEDULE 5.02(f)        Investments

                                    EXHIBITS
                                    --------

EXHIBIT A-1         Form of Terra Note
EXHIBIT A-2         Form of TNLP Note
EXHIBIT B-1         Form of Amended and Restated Holdings Pledge
                      Agreement
EXHIBIT B-2         Form of Amended and Restated Terra Capital
                      Pledge Agreement
EXHIBIT B-3         Form of Amended and Restated Subsidiary
                      Pledge and Security Agreement
EXHIBIT B-4         Form of Amended and Restated TNLP Pledge and
                      Security Agreement
EXHIBIT C           Form of Notice of Borrowing
EXHIBIT D           [Intentionally Omitted]
EXHIBIT E           Loan Purchase Agreement
EXHIBIT F           Form of Assignment and Acceptance
EXHIBIT G           Provisions Relating to Certain Investments
EXHIBIT H           Form of Intercreditor Agreement

                                     (iii)
<PAGE>
 
                               CREDIT AGREEMENT

          AMENDED AND RESTATED CREDIT AGREEMENT dated as of December 31, 1997
among:

     (1)  TERRA CAPITAL, INC., a Delaware corporation (the "Company");

     (2)  TERRA NITROGEN, LIMITED PARTNERSHIP, a Delaware limited partnership
          and a Subsidiary of the Company ("TNLP");

     (3)  each of the corporations and limited partnerships listed on the
          signature pages hereof under the caption "GUARANTORS";

     (4)  each of the lenders (the "Initial Lenders") listed on the signature
          pages hereof; and

     (5)  CITIBANK, N.A., as agent (together with its successor in such capacity
          appointed pursuant to Article VII, the "Administrative Agent") for the
          Lenders and the Issuing Banks hereunder.

                            PRELIMINARY STATEMENTS:

          Capitalized terms used in these Preliminary Statements and not
otherwise defined have the meanings assigned to them in Section 1.01.

          (a)  The Company, TNLP, certain Guarantors, the Initial Lenders (or
certain of their Affiliates), the Retiring Lenders, the Issuing Banks and the
Administrative Agent are parties to an Amended and Restated Credit Agreement
dated as of December 14, 1995 (as heretofore amended to and in effect on the
Restatement Date, the "Existing Credit Agreement") providing, subject to the
terms and conditions thereof, for the making of working capital advances to, and
the issuance of letters of credit for the account of, the Company and for the
making of working capital advances to, and the issuance of letters of credit for
the account of, TNLP.

          (b)  The Company, TNLP, the Guarantors, the Initial Lenders, the
Issuing Banks and the Administrative Agent wish to amend the Existing Credit
Agreement, among other things:

          (1)  to permit the Company to acquire, indirectly through Terra U.K.,
     the U.K. Nitrogen Assets from ICI pursuant to the Sale of Business
     Agreement (the "U.K. Nitrogen Acquisition");
<PAGE>
 
                                     - 2 -

          (2)  to permit the BMLP Restructuring to occur;

          (3)  to permit the Company, indirectly through Terra U.K. Holdings, to
     construct the Ammonia Loop (and, in that connection, to create Beaumont
     Ammonia, Inc., a Delaware corporation and Subsidiary of Terra U.K.
     Holdings, the principal business of which shall be the construction and
     operation of the Ammonia Loop);

          (4)  to make certain other changes to the Existing Credit Agreement
     and the other Loan Documents (including, without limitation, to provide
     that (x) the "Applicable Commitment Fee Rate" during the period from the
     Restatement Date until the Quarterly Date in December, 1998 shall be not
     less than 0.375% per annum and (y) the "Applicable Margin" during the
     period from the Restatement Date until the Quarterly Date in December, 1998
     shall be not less than 0.375% per annum (in the case of Base Rate Advances)
     and not less than 1.250% (in the case of Eurodollar Rate Advances);

          (5)  to reduce the aggregate Commitments to $350,000,000; and

          (6)  to reflect that the Retiring Lenders shall cease to be parties
     hereto,

all on the terms and conditions set forth herein, it being the intention of the
parties hereto that the advances and letters of credit outstanding under the
Existing Credit Agreement on the Restatement Date shall continue and remain
outstanding and not be repaid on the Restatement Date.

          NOW, THEREFORE, in consideration of the premises and of the mutual
covenants and agreements contained herein, the parties hereto hereby agree that
the Existing Credit Agreement shall (subject to the satisfaction of the
conditions precedent specified in Section 3) be amended and restated to read as
set forth herein.

                                   ARTICLE I

                       DEFINITIONS AND ACCOUNTING TERMS

          Section 1.01.  Certain Defined Terms.   As used in this Agreement, the
following terms shall have the following meanings (such meanings to be equally
applicable to both the singular and plural forms of the terms defined):
<PAGE>
 
                                     - 3 -

          "Acquired Debt" means, without duplication:

               (a)  Debt of Subsidiaries of Terra acquired by Terra or any of
          its Subsidiaries after the Restatement Date;

               (b)  Debt assumed by Terra (whether by operation of law or
          contract or otherwise) in connection with mergers by Terra after the
          Restatement Date consummated in accordance with Section
          5.02(d)(ii)(y); and

               (c)  assumptions or Guarantees of other Acquired Debt by Terra or
          one of its Subsidiaries.

          "Adjusted Debt to Cash Flow Ratio" means, for any period, the ratio of
     (i) Funded Debt of the Adjusted Terra Group on a Consolidated basis as at
     the last day of such period to (ii) EBITDA of the Adjusted Terra Group on a
     Consolidated basis for such period.

          "Adjusted Interest Coverage Ratio" means, for any period, the ratio of
     (i) EBITDA of the Adjusted Terra Group on a Consolidated basis for such
     period to (ii) Cash Interest Expense of the Adjusted Terra Group on a
     Consolidated basis for such period.

          "Adjusted Net Worth" means, at any time, the sum of the following for
     Terra and its Subsidiaries on a Consolidated basis:

               (a)  the Net Worth of Terra and its Subsidiaries on a
          Consolidated basis; minus

               (b)  the Net Worth of Terra Canada and its Subsidiaries
          (including, without limitation, Terra U.K. and its Subsidiaries) on a
          Consolidated basis; minus

               (c)  from and after the BMLP Restructuring Time, the Net Worth of
          BMLP and its Subsidiaries (including, without limitation, Terra U.K.
          Holdings, BAI and their respective Subsidiaries) on a Consolidated
          basis minus the BMLP Class A Capital Contribution Amount as at such
          time (to the extent such amount was included in determining Net Worth
          of BMLP and its Subsidiaries).

          "Adjusted Terra Group" means, collectively, Terra and its Subsidiaries
     (other than members of the Terra Canada Group and, from and after the BMLP
     Restructuring Time, members of the BMLP Group).
<PAGE>
 
                                     - 4 -

          "Administrative Agent" has the meaning specified in the recital of
     parties to this Agreement.

          "Administrative Agent's Account" means the account of the
     Administrative Agent maintained by the Administrative Agent at its office
     at 2 Penns Way, Suite 200, New Castle, Delaware, 19720, Account No. 368-
     52248, Attention:  Carlos Lopez (or his successor), or such other account
     maintained by the Administrative Agent as may be designated by the
     Administrative Agent in a written notice to the Lenders, each Issuing Bank
     and the Borrowers.

          "Advance" means a Terra Advance or a TNLP Advance.
 
          "Affiliate" means, as to any Person, any other Person that, directly
     or indirectly, controls, is controlled by or is under common control with
     such Person or is a director or officer of such Person.  For purposes of
     this definition, the term "control" (including the terms "controlling",
     "controlled by" and "under common control with") of a Person means the
     possession, direct or indirect, of the power to vote 10% or more of the
     voting stock of such Person or to direct or cause the direction of the
     management and policies of such Person, whether through the ownership of
     voting stock, by contract or otherwise.

          "AMCI Senior Note Indenture" means the Indenture dated as of October
     15, 1993 between Terra and Society National Bank, as Trustee, providing for
     the issuance of the AMCI Senior Notes, as from time to time amended.

          "AMCI Senior Notes" means the 10-3/4% senior notes of Terra due 2003
     issued pursuant to the AMCI Senior Note Indenture.

          "Ammonia Loop" means the ammonia loop facility to be constructed as an
     extension of BMLP's methanol plant pursuant to the Engineering, Procurement
     and Construction Agreement dated as of October 20, 1997 between TNC and
     Foster Wheeler USA Corporation, as from time to time amended.

          "Ammonium Nitrate Hedging Agreement" means an agreement between Terra
     Canada and ICI pursuant to which Terra Canada agrees to pay certain amounts
     to ICI in the event that the annual average price of ammonium nitrate
     exceeds (Pounds)100 per tonne, as from time to time amended (without
     prejudice to Section 5.02(l)).
<PAGE>
 
                                     - 5 -

          "Applicable Commitment Fee Rate" means 0.50% per annum; provided that:

          (1)  The Applicable Commitment Fee Rate shall, from the Restatement
     Date until the Quarterly Date falling in March, 1998, be 0.375% per annum.

          (2)  Subject to clause (1) above and clause (3) below, if for any
     Rolling Period ending on or after the Restatement Date the Debt to Cash
     Flow Ratio for such Rolling Period shall be within any of the ranges
     specified in the schedule below, then, subject to the delivery to the
     Administrative Agent of a certificate of the Senior Financial Officer
     demonstrating the same prior to the first Quarterly Date (the "relevant
     Quarterly Date") occurring after the end of such Rolling Period, the
     "Applicable Commitment Fee Rate" shall be changed to the percentage per
     annum set forth opposite the reference to such range in such schedule
     during the period commencing on the relevant Quarterly Date until the next
     succeeding Quarterly Date thereafter:

            Range of Debt           Applicable Commitment
          to Cash Flow Ratio              Fee Rate
          ------------------        ---------------------
          Greater than 3.00 to 1          0.500%

          Less than or equal to
            3.00 to 1 and greater
            than 2.00 to 1                0.375%
 
          Less than or equal to
            2.00 to 1 and greater
            than 1.25 to 1                0.250%
 
          Less than or equal to
            1.25 to 1 and greater
            than 0.75 to 1                0.225%
          Less than or equal to
            0.75 to 1                     0.200%

          (3)  Notwithstanding any reduction in the Applicable Commitment Fee
     Rate below 0.375% per annum that would otherwise be made pursuant to clause
     (2) above, the "Applicable Commitment Fee Rate" during the period from the
     Restatement Date until the Quarterly Date in December, 1998 shall be not
     less than 0.375% per annum.

          "Applicable Lending Office" means, with respect to each Lender, such
     Lender's Domestic Lending Office in the case of
<PAGE>
 
                                     - 6 -

     a Base Rate Advance and such Lender's Eurodollar Lending Office in the case
     of a Eurodollar Rate Advance.

          "Applicable Letter of Credit Fee Rate" means, at any time, a rate per
     annum equal to the Applicable Margin for Eurodollar Rate Advances in effect
     at such time.

          "Applicable Margin" means, (a) with respect to all Base Rate Advances,
     0.50% per annum and (b) with respect to all Eurodollar Rate Advances, 2.00%
     per annum; provided that:

               (1)  The Applicable Margin with respect to all Base Rate Advances
          and Eurodollar Rate Advances shall, from the Restatement Date until
          the Quarterly Date falling in March, 1998, be 0.375% per annum (in the
          case of such Base Rate Advances) and 1.250% per annum (in the case of
          such Eurodollar Rate Advances).

               (2)  Subject to clause (1) above and clause (3) below, if for any
          Rolling Period ending on or after the Restatement Date the Debt to
          Cash Flow Ratio for such Rolling Period shall be within any of the
          ranges specified in the schedule below, then, subject to the delivery
          to the Administrative Agent of a certificate of the Senior Financial
          Officer demonstrating the same prior to the first Quarterly Date (the
          "relevant Quarterly Date") occurring after the end of such Rolling
          Period, the "Applicable Margin" shall be changed to the percentage per
          annum for the respective Type of Advance set forth opposite the
          reference to such range in such schedule during the period commencing
          on the relevant Quarterly Date until the next succeeding Quarterly
          Date thereafter:
<TABLE>
<CAPTION>

                            Applicable Margin (% p.a.)
                           ----------------------------

  Range of Debt            Base Rate    Eurodollar Rate
to Cash Flow Ratio          Advances       Advances
- ------------------         ---------    ---------------

<S>                        <C>          <C>
Greater than 3.00 to 1         0.500%       2.000%

Less than or equal to
  3.00 to 1 and greater
  than 2.00 to 1               0.375%       1.250%

Less than or equal to
  2.00 to 1 and greater
  than 1.25 to 1               0.250%       0.750%
</TABLE>
<PAGE>
 
                                     - 7 -

<TABLE>
<S>                            <C>         <C>
     Less than or equal to
       1.25 to 1 and greater
       than 0.75 to 1          0.000%      0.625%
 
     Less than or equal to
       0.75 to 1               0.000%      0.500%
</TABLE>

          (3)  Notwithstanding any reduction in the Applicable Margin below
     0.375% per annum (in the case of Base Rate Advances) or 1.250% per annum
     (in the case of Eurodollar Rate Advances) that would otherwise be made
     pursuant to clause (2) above, the "Applicable Margin" during the period
     from the Restatement Date until the Quarterly Date in December, 1998 shall
     be not less than 0.375% per annum (in the case of Base Rate Advances) and
     not less than 1.250% (in the case of Eurodollar Rate Advances).

          "Assignment and Acceptance" means an assignment and acceptance entered
     into by a Lender and an Eligible Assignee, and accepted by the
     Administrative Agent, in accordance with Section 9.07 and in substantially
     the form of Exhibit F.

          "Available Amount" of any Letter of Credit means the maximum amount
     available to be drawn under such Letter of Credit (assuming compliance with
     all conditions to drawing specified therein).

          "BAI" means Beaumont Ammonia, Inc., a Delaware corporation and
     Subsidiary of Terra U.K. Holdings, the principal business of which shall be
     the construction and operation of the Ammonia Loop.

          "Base Rate" means a fluctuating interest rate per annum in effect from
     time to time, which rate per annum shall at all times be equal to the
     highest of:

               (a)  the rate of interest announced publicly by Citibank in New
          York, New York, from time to time, as Citibank's base rate;

               (b)  0.50% per annum above the Federal Funds Rate; and

               (c)  the sum (adjusted to the nearest 0.25% or, if there is no
          nearest 0.25%, to the next higher 0.25%) of (i) 0.50% per annum plus
          (ii) the rate obtained by dividing (x) the latest three-week moving
          average of secondary market morning offering rates in the United
          States for three-month certificates of deposit of major
<PAGE>
 
                                     - 8 -

          United States money center banks, such three-week moving average
          (adjusted to the bases of a year of 360 days) being determined weekly
          on each Monday (or, if such date is not a Business Day, on the next
          succeeding Business Day) for the three-week period ending on the
          previous Friday by Citibank on the basis of such rates reported by
          certificate of deposit dealers to and published by the Federal Reserve
          Bank of New York or, if such publication shall be suspended or
          terminated, on the basis of quotations for such rates received by
          Citibank from three New York certificate of deposit dealers of
          recognized standing selected by Citibank by (y) a percentage equal to
          100% minus the average of the daily percentages specified during such
          three-week period by the Board of Governors of the Federal Reserve
          System (or any successor) for determining the maximum reserve
          requirement (including, but not limited to, any emergency,
          supplemental or other marginal reserve requirement) for Citibank with
          respect to liabilities consisting of or including (among other
          liabilities) three-month U.S. Dollar non-personal time deposits in the
          United States plus (iii) the average during such three-week period of
          the annual assessment rates estimated by Citibank for determining the
          then current annual assessment rate payable by Citibank to the Federal
          Deposit Insurance Corporation (or any successor) for insuring U.S.
          Dollar deposits of Citibank in the United States.

     Each change in any interest rate provided for herein based upon the Base
     Rate resulting from a change in the Base Rate shall take effect at the time
     of such change in the Base Rate.

          "Base Rate Advance" means an Advance that bears interest as provided
     in Section 2.06(a)(i).

          "Basic Documents" means the Loan Documents and the Intercreditor
     Agreement.

          "BFI" means Britz Fertilizer, Inc., a California corporation.

          "Blytheville Assets" means TI's Blytheville, Arkansas facility and
     related assets having (in the reasonable judgment of TI's Board of
     Directors) an aggregate fair market value not exceeding $5,000,000.

          "BMCH" means BMC Holdings, Inc., a Delaware corporation.
<PAGE>
 
                                     - 9 -

          "BMLP" means Beaumont Methanol, Limited Partnership, a Delaware
     limited partnership.

          "BMLP Class A Capital Contribution Amount" means, at any time, the
     aggregate amount of the BMLP Class A Limited Partner's capital
     contributions to BMLP (net of redemptions thereof).

          "BMLP Class A Limited Partner" means the holder from time to time of
     the BMLP Class A Limited Partnership Interest.

          "BMLP Class A Limited Partnership Interest" means a Class A limited
     partnership interest in BMLP.

          "BMLP Demand Loans" has the meaning assigned to such term in Section
     5.02(b)(2)(ii).

          "BMLP First Priority Distributions" means, for any period, the
     aggregate amount of distributions (exclusive of redemptions) made by BMLP
     in cash during such period in respect of the BMLP Class A Limited
     Partnership Interest pursuant to the terms of the BMLP Partnership
     Agreement.

          "BMLP Group" means, collectively, BMLP and its Subsidiaries, and a
     "member" of the BMLP Group means, individually, BMLP and each such
     Subsidiary.

          "BMLP Partners" means, collectively, TMC, BMCH and, from and after the
     BMLP Restructuring Time, the BMLP Class A Limited Partner.

          "BMLP Partnership Agreement" means the agreement of limited
     partnership of BMLP, as amended and restated at the BMLP Restructuring Time
     and as further amended from time to time (without prejudice to Section
     5.02(j)).

          "BMLP Restructuring" means the sale of the BMLP Class A Limited
     Partnership Interest to a Person that is not an Affiliate of Terra,
     provided that such sale, and the transactions related thereto, shall be
     effected in accordance with the following terms (or on such other terms as
     shall be reasonably satisfactory to the Required Lenders):

               (A)  both immediately prior to and after giving effect thereto,
          no Default or Event of Default shall have occurred and be continuing;
<PAGE>
 
                                     - 10 -

               (B)  the aggregate cash proceeds received by BMLP from the BMLP
          Class A Limited Partner in connection with the issuance of the BMLP
          Class A Limited Partnership Interest shall be not less than
          $225,000,000; and

               (C)  the Company shall deliver to the Administrative Agent a
          true, correct and complete copy of each of the principal documents
          executed in connection with the BMLP Restructuring and shall certify
          to the Administrative Agent and the Lenders that the same has been (or
          is being) consummated in accordance with the terms and conditions set
          forth herein.

          "BMLP Restructuring Time" means the time as of which the BMLP
     Restructuring shall have occurred in accordance with the terms set forth
     herein and in the other Loan Documents.

          "BMLP Support and Option Agreement" means a Support and Option
     Agreement dated as of the date of the BMLP Restructuring among the Company,
     the BMLP Class A Limited Partner and the holders of the BMLP Class A
     Limited Partnership Interest, as from time to time amended.

          "Borrower" means each of the Company and TNLP; provided that when
     reference is made in this Agreement or in any other Loan Document to the
     "relevant" Borrower in connection with either Facility, such reference
     shall be deemed to refer (a) in the case of the Terra Facility, to the
     Company, and (b) in the case of the TNLP Facility, to TNLP.

          "Borrower's Account" means (a) in the case of the Company, the account
     of the Company maintained with Citibank at its office at 399 Park Avenue,
     New York, New York 10043, Account No. 4065-6098, and (b) in the case of
     TNLP, the account of TNLP maintained with Citibank at its office at 399
     Park Avenue, New York, New York 10043, Account No. 4065-6071; or, in either
     case, such other account maintained by the relevant Borrower with Citibank
     and designated by such Borrower in a written notice to the Administrative
     Agent.

          "Borrowing" means a Terra Borrowing or a TNLP Borrowing.

          "Britz Documents" means the Britz LLC Agreement and the Britz JV
     Agreement.
<PAGE>
 
                                     - 11 -

          "Britz JV Agreement" means the Joint Venture Agreement among TI, BFI,
     Britz LLC and certain other Persons pursuant to which TI will acquire
     ownership interests in Britz LLC, as amended from time to time.

          "Britz LLC" means Britz Fertilizer, L.L.C., a Delaware limited
     liability company, as the same may be renamed from time to time.

          "Britz LLC Agreement" means the limited liability company management
     agreement for Britz LLC, as the same may be in effect from time to time.

          "Business Day" means a day on which banks are not required or
     authorized to close in New York City and, if such Business Day relates to a
     Eurodollar Rate Advance, on which dealings are carried on in the London
     interbank market.

          "Capital Expenditures" means, for any period with respect to any
     Person, the sum of all expenditures during such period (whether paid in
     cash or accrued as liabilities during such period) that, in conformity with
     GAAP, are required to be included in or reflected on the balance sheet of
     such Person in respect of equipment, fixed assets, real property or
     improvements, or for replacements or substitutions therefor or additions
     thereto, plus (without duplication) the amount of expenditures deemed to be
     made in connection with equipment that is purchased simultaneously with the
     trade-in of existing equipment owned by such Person to the extent the gross
     amount of the purchase price of such purchased equipment exceeds the fair
     market value (as determined in good faith by such Person) of the equipment
     then being traded in, but excluding expenditures made in connection with
     the replacement or restoration of assets to the extent such replacement or
     restoration is financed from insurance proceeds paid on account of loss or
     damage to the assets so replaced or restored.

          "Capital Lease Obligations" means, for any Person, all obligations of
     such Person to pay rent or other amounts under a lease of (or other
     agreement conveying the right to use) property to the extent such
     obligations are required to be classified and accounted for as a capital
     lease on a balance sheet of such Person under GAAP, and, for purposes of
     this Agreement, the amount of such obligations shall be the capitalized
     amount thereof, determined in accordance with GAAP.
<PAGE>
 
                                     - 12 -

          "Cash Interest Expense" means, for any Person for any period (without
     duplication), interest expense net of interest income, whether paid or
     accrued (including the interest component of Capital Lease Obligations), on
     all Debt of such Person for such period, including, without limitation, (a)
     interest expense in respect of the Advances, (b) commissions, discounts and
     other fees and charges payable in connection with letters of credit
     (including, without limitation, any Letter of Credit) and (c) the net
     payment, if any, payable in connection with any Hedge Agreement; excluding,
     in each case, interest not payable in cash (including, without limitation,
     amortization of original issue discount and the interest portion of any
     deferred payment obligation); all as determined in accordance with GAAP for
     such period.

          "Casualty Event" means, with respect to any property of any Person,
     any loss of or damage to, or any condemnation or other taking of, such
     property for which such Person or any of its Subsidiaries receives
     insurance proceeds, or proceeds of a condemnation award or other
     compensation.

          "CERCLA" means the Comprehensive Environmental Response, Compensation
     and Liability Act of 1980, as amended.

          "Citibank" means Citibank, N.A., a national banking association.

          "Collateral" means all "Collateral" referred to in the Security
     Documents and all other property that is subject to any Lien created by any
     Security Document in favor of the Collateral Agent.

          "Collateral Agent" means Citibank, in its capacity as Collateral Agent
     for the Secured Parties under and as defined in the Security Documents and
     the Intercreditor Agreement, together with its successors in such capacity.

          "Commitment" means a Terra Commitment or a TNLP Commitment.

          "Commitment Termination Date" means the Terra Commitment Termination
     Date or the TNLP Commitment Termination Date.

          "Confidential Information" means information identified as such that
     Terra or any of its Subsidiaries furnishes to the Administrative Agent, any
     Issuing Bank or any Lender, but does not include any such information once
     such
<PAGE>
 
                                     - 13 -

     information has become generally available to the public or once such
     information has become available to the Administrative Agent, any Issuing
     Bank or any Lender from a source other than Terra and its Subsidiaries
     (unless, in either case, such information becomes so available as a result
     of the breach by the Administrative Agent, an Issuing Bank or a Lender of
     its duty of confidentiality set forth in Section 9.10).

          "Consolidated" refers to the consolidation of accounts in accordance
     with GAAP.

          "Consolidated Group" means, collectively, Terra and its Consolidated
     Subsidiaries, and a "member" of the Consolidated Group means Terra or any
     such Subsidiary.

          "Continuation", "Continue" and "Continued" each refers to a
     continuation of Eurodollar Rate Advances from one Interest Period to the
     next Interest Period pursuant to Section 2.08.

          "Conversion", "Convert" and "Converted" each refers to a conversion of
     Advances of one Type into Advances of the other Type pursuant to Section
     2.08 or 2.09.

          "Covered Transaction" means, collectively:

          (1) the Transactions (as defined in the Original Credit Agreement) or
     any part thereof, including, without limitation, the Initial Merger and the
     Second Merger referred to therein and any of the other transactions
     contemplated thereby;

          (2) the SPU Redemption;

          (3) the U.K. Nitrogen Acquisition;

          (4) the BMLP Restructuring; and

          (5) the construction of the Ammonia Loop.

          "Cumulative Adjusted Net Income" means, for any period, the sum, for
     each complete fiscal year of Terra (beginning with the fiscal year ending
     December 31, 1995) during such period, of the Adjusted Net Income Amounts
     for all such fiscal years.  For purposes of this definition, "Adjusted Net
     Income Amount" means, for any fiscal year of Terra, the greater of (x)
     33-1/3% of the net income of Terra and its Subsidiaries on a Consolidated
     basis during such fiscal year and (y) $20,000,000.
<PAGE>
 
                                     - 14 -

          "Debt" of any Person means (without duplication):  (a) all
     indebtedness of such Person for borrowed money, (b) all Obligations of such
     Person for the deferred purchase price of property or services (other than
     any trade payable having a tenor of not more than 365 days, or any like
     item arising from the purchase of equipment or services having a tenor of
     not more than 90 days, in each case incurred in the ordinary course of
     business and on normal business terms and in each case not overdue by more
     than 30 days, and other than any Obligations in respect of letters of
     credit supporting any such trade payable or like item), (c) all Obligations
     of such Person evidenced by notes, bonds, debentures or other similar
     instruments, (d) all indebtedness created or arising under any conditional
     sale or other title retention agreement with respect to property acquired
     by such Person (even though the rights and remedies of the seller or lender
     under such agreement in the event of default are limited to repossession or
     sale of such property), (e) all Capital Lease Obligations and Major
     Operating Lease Obligations of such Person, (f) all Obligations, contingent
     or otherwise, of such Person under acceptance, letter of credit or similar
     facilities (other than Obligations in respect of letters of credit referred
     to in clause (b) of this definition), (g) all Obligations of such Person to
     purchase, redeem, retire, defease or otherwise make any payment in respect
     of any Redeemable capital stock, which Obligations shall be valued at the
     greater of its voluntary or involuntary liquidation preference plus accrued
     and unpaid dividends, (h) all Obligations of such Person in respect of
     Hedge Agreements, (i) all Debt of others referred to in clauses (a) through
     (h) above guaranteed directly or indirectly in any manner by such Person,
     or in effect guaranteed directly or indirectly by such Person through an
     agreement (i) to pay or purchase such Debt or to advance or supply funds
     for the payment or purchase of such Debt, (ii) to purchase, sell or lease
     (as lessee or lessor) property, or to purchase or sell services, primarily
     for the purpose of enabling the debtor to make payment of such Debt or to
     assure the holder of such Debt against loss, (iii) to supply funds to or in
     any other manner invest in the debtor (including any agreement to pay for
     property or services irrespective of whether such property is received or
     such services are rendered) or (iv) otherwise to assure a creditor against
     loss, and (j) all Debt referred to in clauses (a) through (i) above secured
     by (or for which the holder of such Debt has an existing right, contingent
     or otherwise, to be secured by) any Lien on property (including, without
     limitation, accounts and contract rights) owned by such Person, even
<PAGE>
 
                                     - 15 -

     though such Person has not assumed or become liable for the payment of such
     Debt.

          "Debt to Cash Flow Ratio" means, for any period, the ratio of:

               (1)  the sum of (x) Funded Debt of Terra and its Subsidiaries on
          a Consolidated basis as of the last day of such period plus (y) from
          and after the BMLP Restructuring Time, the BMLP Class A Capital
          Contribution Amount as at the last day of such period to

               (2)  the sum of (x) EBITDA of Terra and its Subsidiaries on a
          Consolidated basis for such period plus (y) from and after the BMLP
          Restructuring Time, the aggregate amount of BMLP First Priority
          Distributions made during such period (to the extent such
          distributions were deducted in determining such EBITDA for such
          period).

          "Default" means any event that would constitute an Event of Default
     but for the requirement that notice be given or time elapse or both.

          "Disposition" means any sale, assignment, transfer or other
     disposition of any property (whether now owned or hereafter acquired) by
     Terra or any of its Subsidiaries, but excluding any sale, assignment,
     transfer or other disposition of any property (i) sold or disposed of in
     the ordinary course of business and on ordinary business terms, or (ii) by
     any Obligor or a wholly owned Subsidiary of an Obligor to another Obligor
     or to a wholly owned Subsidiary of an Obligor, or (iii) that consists of
     outmoded or obsolete items, provided that the aggregate value of all such
     excluded outmoded or obsolete items with a value of $1,000,000 or more each
     shall not exceed $10,000,000.

          "Dividend Payments" means dividends (in cash, property or obligations)
     on, or other payments or distributions on account of, or the setting apart
     of money for a sinking or other analogous fund for, or the purchase,
     redemption, retirement or other acquisition of, any shares of any class of
     stock of the Company or of any warrants, options or other rights to acquire
     the same (or to make any payment to any Person, such as "phantom stock"
     payments, where the amount thereof is calculated with reference to the fair
     market or equity value of Terra, the Company or any of their Subsidiaries,
     other than any such payment made in the ordinary course of business of such
     Person in connection
<PAGE>
 
                                     - 16 -

     with an executive compensation plan approved by the Board of Directors of
     such Person), but excluding dividends payable solely in shares of common
     stock of the Company.

          "Domestic Lending Office" means, with respect to any Lender, the
     office of such Lender specified as its "Domestic Lending Office" opposite
     its name on Schedule 2.01 or in the Assignment and Acceptance pursuant to
     which it became a Lender, or such other office of such Lender as such
     Lender may from time to time specify to the Administrative Agent.

          "EBITDA" of any Person for any period means the following, determined
     in accordance with GAAP:  net income (or net loss) plus the sum of (a)
     interest expense, (b) income tax expense and (c) depreciation expense,
     amortization expense and other non-cash charges deducted in arriving at
     such net income (or loss).

          "Eligible Assignee" means (a) any other Lender or any affiliate of any
     Lender; (b) a commercial bank organized under the laws of the United
     States, or any State thereof, and having total assets in excess of
     $1,000,000,000; (c) a savings and loan association or savings bank
     organized under the laws of the United States, or any State thereof, and
     having a net worth in excess of $100,000,000; (d) a commercial bank
     organized under the laws of any other country that is a member of the OECD
     or has concluded special lending arrangements with the International
     Monetary Fund associated with its General Arrangements to Borrow, or a
     political subdivision of any such country, and having total assets in
     excess of $1,000,000,000, so long as such bank is acting through a branch
     or agency located in the country in which it is organized or another
     country that is described in this clause (d); (e) the central bank of any
     country that is a member of the OECD; (f) a finance company, insurance
     company or other financial institution or fund (whether a corporation,
     partnership, trust or other entity) that is engaged in making, purchasing
     or otherwise investing in commercial loans in the ordinary course of its
     business and having total assets in excess of $100,000,000; and (g) any
     other Person (other than an Affiliate of the Company) approved by the
     Administrative Agent and the Company, such approval of the Company not to
     be unreasonably withheld or delayed.

          "Environmental Action" means any administrative, regulatory or
     judicial suit, demand, demand letter, claim, notice of non-compliance or
     violation, consent order or consent agreement relating in any way to any
     violation of or liability under any Environmental Law or any Environmental
<PAGE>
 
                                     - 17 -

     Permit, including without limitation (a) any claim by any governmental or
     regulatory authority for enforcement, cleanup, removal, response, remedial
     or other actions or damages pursuant to any Environmental Law, (b) any
     claim by any third party seeking damages, contribution, indemnification,
     cost recovery, compensation or injunctive relief resulting from Hazardous
     Materials or arising from alleged injury or threat of injury to the
     environment and (c) any notice by any governmental or regulatory authority
     alleging that Terra or any of its Subsidiaries is or may be responsible
     for, or is a potentially responsible party with respect to, any cleanup,
     removal, response, remedial or other actions or damages pursuant to any
     Environmental Law.

          "Environmental Law" means any federal, state or local governmental
     law, rule, regulation, order, writ, judgment, injunction or decree relating
     to pollution or protection of the environment or the treatment, storage,
     disposal, release, threatened release or handling of Hazardous Materials,
     including, without limitation, CERCLA, the Resource Conservation and
     Recovery Act, the Hazardous Materials Transportation Act, the Clean Water
     Act, the Toxic Substances Control Act, the Clean Air Act, the Safe Drinking
     Water Act, the Atomic Energy Act and the Federal Insecticide, Fungicide and
     Rodenticide Act, in each case, as amended from time to time.

          "Environmental Permit" means any permit, approval, identification
     number, license or other authorization required under any Environmental
     Law.

          "ERISA" means the Employee Retirement Income Security Act of 1974, as
     amended from time to time, and the regulations promulgated and rulings
     issued thereunder.

          "ERISA Affiliate" of any Person means any other Person that for
     purposes of Title IV of ERISA is a member of such Person's controlled
     group, or under common control with such Person, within the meaning of
     Sections 414(b), (c), (m) and (o) of the Internal Revenue Code.

          "ERISA Event" with respect to any Person means (a) the occurrence of a
     reportable event, within the meaning of Section 4043 of ERISA, with respect
     to any Plan of such Person or any of its ERISA Affiliates unless the 30-day
     notice requirement with respect to such event has been waived pursuant to
     regulations under Section 4043 of ERISA and excluding a reportable event
     under Section 4043(c)(7) of ERISA; (b) the provision by the administrator
     of any Plan of such Person or any of its ERISA Affiliates of a notice of
<PAGE>
 
                                     - 18 -

     intent to terminate such Plan, pursuant to Section 4041(c) of ERISA as a
     distress termination; (c) the cessation of operations at a facility of such
     Person or any of its ERISA Affiliates in the circumstances described in
     Section 4062(e) of ERISA; (d) the withdrawal by such Person or any of its
     ERISA Affiliates from a Multiple Employer Plan during a plan year for which
     it was a substantial employer, as defined in Section 4001(a)(2) of ERISA;
     (e) the satisfaction of the conditions set forth in Sections 302(f)(1)(A)
     and (B) of ERISA to the creation of a lien upon property or rights to
     property of such Person or any ERISA Affiliate for failure to make a
     required payment to a Plan; (f) the adoption of an amendment to a Plan of
     such Person or any of its ERISA Affiliates requiring the provision of
     security to such Plan, pursuant to Section 307 of ERISA; or (g) the
     institution by the PBGC of proceedings to terminate a Plan of such Person
     or any of its ERISA Affiliates, pursuant to Section 4042 of ERISA, or the
     occurrence of any event or condition described in Section 4042 of ERISA
     that constitutes grounds for the termination of, or the appointment of a
     trustee to administer, such Plan.

          "Eurocurrency Liabilities" has the meaning specified in Regulation D
     of the Board of Governors of the Federal Reserve System, as in effect from
     time to time.

          "Eurodollar Lending Office" means, with respect to any Lender, the
     office of such Lender specified as its "Eurodollar Lending Office" opposite
     its name on Schedule 2.01 or in the Assignment and Acceptance pursuant to
     which it became a Lender (or, if no such office is specified, its Domestic
     Lending Office), or such other office of such Lender as such Lender may
     from time to time specify to the Administrative Agent.

          "Eurodollar Rate" means, for any Interest Period for each Eurodollar
     Rate Advance comprising part of the same Borrowing, an interest rate per
     annum equal to the rate per annum obtained by dividing (a) the average
     (rounded upward to the nearest whole multiple of 1/16 of 1% per annum, if
     such average is not such a multiple) of the rates per annum at which
     deposits in U.S. dollars are offered by the principal office of each of the
     Reference Banks in London, England to prime banks in the London interbank
     market at approximately 5:00 P.M. (London time) two Business Days before
     the first day of such Interest Period in an amount substantially equal to
     such Reference Bank's Eurodollar Rate Advance comprising part of such
     Borrowing (determined without giving effect to any assignments or
     participations by such Reference Bank) and for a period equal to such
<PAGE>
 
                                     - 19 -

     Interest Period by (b) a percentage equal to 100% minus the Eurodollar Rate
     Reserve Percentage for such Interest Period.  The Eurodollar Rate for each
     Interest Period for each Eurodollar Rate Advance comprising part of the
     same Borrowing shall be determined by the Administrative Agent on the basis
     of applicable rates furnished to and received by the Administrative Agent
     from the Reference Banks two Business Days before the first day of such
     Interest Period, subject, however, to the provisions of Section 2.09.

          "Eurodollar Rate Advance" means an Advance that bears interest as
     provided in Section 2.06(a)(ii).

          "Eurodollar Rate Reserve Percentage" for any Interest Period for each
     Eurodollar Rate Advance comprising part of the same Borrowing means the
     reserve percentage (if any) applicable two Business Days before the first
     day of such Interest Period under regulations issued from time to time by
     the Board of Governors of the Federal Reserve System (or any successor) for
     determining the maximum reserve requirement (including, without limitation,
     any emergency, supplemental or other marginal reserve requirement) for a
     member bank of the Federal Reserve System in New York City with deposits
     exceeding $1,000,000,000 with respect to liabilities or assets consisting
     of or including Eurocurrency Liabilities (or with respect to any other
     category of liabilities that includes deposits by reference to which the
     interest rate on Eurodollar Rate Advances is determined) having a term
     equal to such Interest Period.

          "Events of Default" has the meaning specified in Section 6.01.

          "Excluded Period" means, with respect to any additional amount payable
     under Section 2.09 or 2.13, the period ending 120 days prior to the
     applicable Lender's delivery of a certificate referenced in Section
     2.09(a), 2.09(b) or 2.13(d), as applicable, with respect to such additional
     amount.

          "Excluded Transactions" means, collectively:

          (1)  Investments contemplated by the Port Neal Transaction;

          (2)  Terra Stock Repurchases;

          (3)  the purchase, redemption or other acquisition of Senior
     Preference Units pursuant to the SPU Redemption;
<PAGE>
 
                                     - 20 -

          (4)  capital contributions by TMC and BMCH to BMLP required to be made
     pursuant to the terms of the BMLP Partnership Agreement or which, if not
     made, would result in the occurrence of a "Notice Event" (as defined in the
     BMLP Partnership Agreement);

          (5)  capital contributions by BMLP to its Subsidiaries and by
     Subsidiaries of BMLP to their respective Subsidiaries;

          (6)  capital contributions to Subsidiaries of Terra (other than, from
     and after the BMLP Restructuring Time, capital contributions to members of
     the BMLP Group not referred to in clauses (4) and (5) above);

          (7)  the U.K. Nitrogen Acquisition; and

          (8)  the redemption of the BMLP Class A Limited Partnership Interest
     pursuant to the BMLP Partnership Agreement and the BMLP Support and Option
     Agreement, and the making of other payments under Article 2 of the BMLP
     Support and Option Agreement.

          "Existing Credit Agreement" has the meaning specified in the
     Preliminary Statements to this Agreement.

          "Extraordinary Expenses" means, collectively, all expenses of BMLP in
     excess of $500,000 for any single occurrence arising from any events,
     developments or circumstances occurring after the BMLP Restructuring Time
     relating to or in connection with or arising out of (a) any "Environmental
     Law" or "Environmental Action", (b)(i) the occurrence of any "ERISA Event"
     with respect to any "Plan" or any "Withdrawal Liability" to any
     "Multiemployer Plan", (ii) the insolvency, reorganization or termination of
     any "Multiemployer Plan", within the meaning of Title IV of ERISA, any
     "accumulated funding deficiency" (as defined in Section 302 of ERISA and
     Section 412 of the Internal Revenue Code), whether or not waived, with
     respect to one or more of the "Plans", or any Lien on the property and
     assets of BMLP or any of the "ERISA Affiliates" of BMLP in favor of PBGC or
     any "Plan", (c) local, state or federal income tax in excess of 6% of
     taxable income as computed for United States federal income tax purposes,
     (d) liability in tort and (e) casualty and condemnation losses.  Quoted
     terms used in this definition have the meanings given to them in the BMLP
     Partnership Agreement.

          "Facility" means the Terra Facility or the TNLP Facility.
<PAGE>
 
                                     - 21 -

          "Farmland JV" means a joint venture (which may be structured as a
     partnership, limited liability company, corporation or other business form)
     between TI and Farmland Industries, Inc. (or one of its Affiliates), in
     which joint venture TI has at least a 50% ownership interest.

          "Federal Funds Rate" means, for any period, a fluctuating interest
     rate per annum equal for each day during such period to the weighted
     average of the rates on overnight Federal funds transactions with members
     of the Federal Reserve System arranged by Federal funds brokers, as
     published for such day (or, if such day is not a Business Day, for the next
     preceding Business Day) by the Federal Reserve Bank of New York, or, if
     such rate is not so published for any day that is a Business Day, the
     average of the quotations for such day for such transactions received by
     the Administrative Agent from three Federal funds brokers of recognized
     standing selected by it.

          "Funded Debt" of any Person means, on any date, the sum (determined
     without duplication) of:  (a) all Debt of such Person that would be listed
     as long-term debt (including Capital Lease Obligations and Major Operating
     Lease Obligations) of such Person on a balance sheet of such Person
     prepared in accordance with GAAP (including, without limitation, the
     current portion of such Debt), plus (b) the aggregate principal amount of
     all outstanding Advances, plus (c) the aggregate amount of all Letters of
     Credit to the extent of unreimbursed drawings thereunder; provided that:

               (1)  the term "Funded Debt" shall include letters of credit
          issued in connection with the insurance program of Terra and its
          Subsidiaries only to the extent of unreimbursed drawings thereunder;
          and

               (2)  the term "Funded Debt" shall not include Obligations under
          Hedge Agreements.

          "GAAP" means generally accepted accounting principles in the United
     States of America as in effect as of the date of, and used in, the
     preparation of the audited financial statements referred to in Section
     4.01(f).

          "Guarantee" by any Person means any arrangement by which such Person
     incurs Debt of the types referred to in clauses (i) and (j) of the
     definition of "Debt" in respect of such Person.

          "Guaranteed Obligations" means the Terra Guaranteed Obligations and
     the TNLP Guaranteed Obligations.
<PAGE>
 
                                     - 22 -

          "Guarantors" means the Terra Guarantors and the TNLP Guarantors.

          "Hazardous Materials" means (a) petroleum or petroleum products,
     natural or synthetic gas, asbestos in any form that is or could become
     friable, and radon gas, (b) any substances defined as or included in the
     definition of "hazardous substances", "hazardous wastes", "hazardous
     materials", "extremely hazardous wastes", "restricted hazardous wastes",
     "toxic substances", "toxic pollutants", "contaminants" or "pollutants", or
     words of similar meaning and regulatory effect, under any Environmental Law
     and (c) any other substance exposure to which is regulated under any
     Environmental Law.

          "Hedge Agreements" means interest rate swap, cap or collar agreements,
     interest rate future or option contracts, currency swap agreements,
     currency future or option contracts, commodity future or option agreements
     and other similar agreements designed to hedge against fluctuations in
     interest rates, foreign exchange rates or commodity prices, including,
     without limitation, (a) the Methanol Hedging Agreement, (b) the Terra U.K.
     Offtake Agreement, and (c) the Ammonium Nitrate Hedging Agreement.

          "Holdings Pledge Agreement" means an Amended and Restated Pledge
     Agreement in the form of Exhibit B-1 between Terra Capital Holdings and the
     Collateral Agent, as from time to time amended.

          "ICI" means, collectively, ICI Chemicals & Polymers Limited and
     Imperial Chemical Industries Plc.

          "Immaterial Subsidiary" means, as of any date of determination, any
     Subsidiary of Terra with not more than $500,000 of assets on such date nor
     more than $100,000 of gross income for the fiscal year of Terra ended on or
     most recently ended prior to such date.

          "Indemnified Party" has the meaning specified in Section 9.04(b).

          "Initial Lenders" has the meaning specified in the recital of the
     parties to this Agreement.

          "Insufficiency" means, with respect to any Plan at any time, the
     amount, if any, by which the "accumulated benefit obligation" (as defined
     in Statement of Financial Accounting Standards 87) exceeds the fair market
     value of the assets of such Plan as of the date of the most recent
     actuarial
<PAGE>
 
                                     - 23 -

     valuation for such Plan, calculated using the actuarial methods, factors
     and assumptions used in such valuation.

          "Intercompany Debt" means Debt owed by Terra or one of its
     Subsidiaries to Terra or one of its Subsidiaries.

          "Intercompany Receivables Facility" means a facility entered into by
     the Company and/or any of its Subsidiaries, as sellers, and one or more
     Receivables Subsidiaries, as purchasers, providing for the sale of
     Receivables by said sellers to said purchasers.

          "Intercreditor Agreement" means a Collateral Agency and Intercreditor
     Agreement substantially in the form of Exhibit H among the Company, certain
     of the other Obligors, the Collateral Agent, the Administrative Agent and
     the other Secured Parties referred to therein (or representatives on their
     behalf), as from time to time amended.

          "Interest Coverage Ratio" means, for any period, the ratio of:

               (1)  the sum of (x) EBITDA of Terra and its Subsidiaries on a
          Consolidated basis for such period plus (y) from and after the BMLP
          Restructuring Time, the aggregate amount of BMLP First Priority
          Distributions made during such period (to the extent such
          distributions were deducted in determining such EBITDA for such
          period) to

               (2)  the sum of (x) Cash Interest Expense of Terra and its
          Subsidiaries on a Consolidated basis for such period plus (y) from and
          after the BMLP Restructuring Time, the aggregate amount of BMLP First
          Priority Distributions made during such period.

          "Interest Period" means, for each Eurodollar Rate Advance comprising
     part of the same Borrowing, the period commencing on the date of such
     Eurodollar Rate Advance or the date of the Conversion of any Base Rate
     Advance into such Eurodollar Rate Advance, and ending on the last day of
     the period selected by the relevant Borrower pursuant to the provisions
     below and, thereafter, each subsequent period commencing on the last day of
     the immediately preceding Interest Period and ending on the last day of the
     period selected by the relevant Borrower pursuant to the provisions below.
     The duration of each such Interest Period shall be one, three or six
     months, as the relevant Borrower may, upon notice received by the
     Administrative Agent not later than 10:00 A.M. (New York City time) on the
     second Business Day
<PAGE>
 
                                     - 24 -

     prior to the first day of such Interest Period, select; provided that:

               (a)  the Company may not select any Interest Period that ends
          after any Terra Commitment Reduction Date unless, after giving effect
          thereto, the aggregate principal amount of Terra Advances having
          Interest Periods that end after such Terra Commitment Reduction Date
          shall be equal to or less than the aggregate principal amount of Terra
          Advances scheduled to be outstanding after giving effect to the
          payments of principal required to be made on such Terra Commitment
          Reduction Date;

               (b)  no Interest Period for any Advance may end after the
          relevant Commitment Termination Date;

               (c)  whenever the last day of any Interest Period would otherwise
          occur on a day other than a Business Day, the last day of such
          Interest Period shall be extended to occur on the next succeeding
          Business Day, provided that, if such extension would cause the last
          day of such Interest Period to occur in the next following calendar
          month, the last day of such Interest Period shall occur on the next
          preceding Business Day; and

               (d)  whenever the first day of any Interest Period occurs on the
          last day of a calendar month (or on any day for which there is no
          numerically corresponding day in the appropriate subsequent calendar
          month), such Interest Period shall end on the last Business Day of the
          appropriate subsequent calendar month.

          "Internal Revenue Code" means the Internal Revenue Code of 1986, as
     amended from time to time, and the regulations promulgated and rulings
     issued thereunder.

          "Investment" in any Person means any loan or advance to such Person,
     any purchase or other acquisition of any capital stock, warrants, rights,
     options, obligations or other securities of such Person, any capital
     contribution to such Person or any other investment in such Person,
     including, without limitation, (a) any arrangement pursuant to which the
     investor Guarantees Debt of another Person, (b) the acquisition of all or
     substantially all of the assets of such Person or of any division of such
     Person, and (c) any merger of or consolidation with such Person; provided
     that the purchase of equipment, fixed assets, real property or improvements
     from such Person do not constitute
<PAGE>
 
                                     - 25 -

     Investments in such Person to the extent the same constitute Capital
     Expenditures.

          "Issuing Bank" means each Lender specified on the signature pages
     hereof as an "Issuing Bank", together with its successors in such capacity.

          "L/C Cash Collateral Account" means the Terra L/C Cash Collateral
     Account and the TNLP L/C Cash Collateral Account.

          "L/C Related Documents" has the meaning specified in Section 2.13(e).

          "Lenders" means the Initial Lenders listed on the signature pages
     hereof and each Eligible Assignee that shall become a party hereto pursuant
     to Section 9.07.  When reference is made in this Agreement or any other
     Loan Document to any "relevant" Lender in connection with any Facility,
     such reference shall be deemed to refer to a Lender that has a Commitment
     or outstanding Advances under such Facility.

          "Letter of Credit Commitment" means the Terra Letter of Credit
     Commitment or the TNLP Letter of Credit Commitment.

          "Letter of Credit Liability" means a Terra Letter of Credit Liability
     or a TNLP Letter of Credit Liability.

          "Letter of Credit Sublimit" means the Terra Letter of Credit Sublimit
     or the TNLP Letter of Credit Sublimit.

          "Letters of Credit" has the meaning specified in Section 2.13(a).

          "Lien" means any lien, security interest or other charge or
     encumbrance of any kind, or any other type of preferential arrangement,
     including, without limitation, the lien or retained security title of a
     conditional vendor and any easement, right of way or other encumbrance on
     title to real property.

          "Loan Documents" means, collectively, this Agreement, the Notes, the
     Security Documents and the Loan Purchase Agreement.

          "Loan Purchase Agreement" means an Amended and Restated Loan Purchase
     Agreement in the form of Exhibit E between the Administrative Agent and
     Terra, as from time to time amended.
<PAGE>
 
                                     - 26 -

          "Major Operating Lease Obligations" means, for any Person, all
     obligations of such Person under an operating lease to pay required
     termination payments or like payments in an amount exceeding $7,000,000 and
     in an amount at least equal to 75% of the original acquisition cost of the
     leased property under such operating lease.

          "Management Agreements" means one or more management agreements
     between Terra and/or certain of its Subsidiaries and other Persons
     providing for the performance by Terra or any of such Subsidiaries of
     certain treasury, purchasing, legal and/or other services for such
     Subsidiaries and such other Persons, as such agreements are in effect from
     time to time.

          "Margin Stock" has the meaning specified in Regulations G, U and X.

          "Material Adverse Change" means, with respect to any Person, any
     material adverse change in the business, assets, operations, properties or
     financial condition of such Person and its Subsidiaries taken as a whole,
     or any material adverse change in the contingent liabilities of such Person
     which could reasonably be expected to result in any of the foregoing, other
     than any of the foregoing resulting solely from a general economic change
     in the industry of such Person and its Subsidiaries.

          "Material Adverse Effect" means a material adverse effect on (a) the
     business, assets, operations, properties or financial condition of Terra
     and its Subsidiaries taken as a whole, or a material adverse effect on the
     contingent liabilities of such Person which could reasonably be expected to
     result in any of the foregoing, (b) the rights and remedies of the
     Administrative Agent, any Issuing Bank or any Lender under any Loan
     Document or (c) the ability of any Obligor to perform its Obligations under
     any Loan Document to which it is or is to be a party.

          "Material Contract" means:

               (A)  each Hedge Agreement;

               (B)  each contract to which Terra or any of its Subsidiaries is a
          party (a "Specified Party") that (a) provides for the provision of
          goods or services by the Specified Party or the receipt of goods or
          services by the Specified Party, (b) has a term of more than one year
          (unless such contract may be cancelled at the sole option of another
          Person party to such contract),
<PAGE>
 
                                     - 27 -

          (c) involves the payment or receipt by the Specified Party of
          consideration having a fair market value in excess of $1,000,000 in
          any fiscal year of Terra and (d) provides for either: (i) the
          provision of goods or services to another Person that is obligated to
          purchase from the Specified Party a specified quantity of such goods
          or services (but only to the extent that, if such other Person did not
          purchase such quantity of such goods or services, the Specified Party
          would not be readily able to sell such goods or services at a price
          equal to or higher than the price set in such contract) or (ii) the
          receipt of goods or services from another Person that is obligated to
          supply to the Specified Party a specified quantity of such goods or
          services (but only to the extent that, if such other Person did not
          supply such quantity of such goods or services, the Specified Party
          would not be readily able to purchase such goods or services at a
          price less than or equal to the price set in such contract); and

               (C)  each contract to which Terra or any of its Subsidiaries is a
          party that, if such contract were to be terminated or the obligations
          of any other Person party to such contract were to fail to be in full
          force and effect, could reasonably be expected, either individually or
          in the aggregate with any other such event, to have a Material Adverse
          Effect.

          "Material Subsidiary" means any Subsidiary of Terra other than an
     Immaterial Subsidiary.

          "Methanol Hedging Agreement" means the Methanol Hedging Agreement
     dated as of October 24, 1994 between BMLP (as successor to Beaumont
     Methanol Corporation) and Morgan Stanley Leveraged Equity Fund II, as
     Agent, as from time to time amended.

          "Minorco" means Minorco, S.A., a Luxembourg societe anonyme, and its
     successors.

          "Minorco USA" means Minorco (U.S.A.) Inc., a Colorado corporation, and
     its successors.

          "Moody's" means Moody's Investors Service, Inc. and its successors.

          "Multiemployer Plan" of any Person means a multiemployer plan, as
     defined in Section 4001(a)(3) of ERISA, to which such Person or any of its
     ERISA Affiliates is making or accruing an obligation to make contributions,
<PAGE>
 
                                     - 28 -

     or has within any of the preceding five plan years made or accrued an
     obligation to make contributions.

          "Multiple Employer Plan" of any Person means a single employer plan,
     as defined in Section 4001(a)(15) of ERISA, that (a) is maintained for
     employees of such Person or any of its ERISA Affiliates and at least one
     Person other than such Person and its ERISA Affiliates or (b) was so
     maintained and in respect of which such Person or any of its ERISA
     Affiliates has or would have liability under Section 4064 or 4069 of ERISA
     in the event such plan has been or were to be terminated.

          "Net Available Proceeds" means:

               (a)  in the case of any Disposition, the aggregate amount of all
          cash payments, and the fair market value of any non-cash
          consideration, received by Terra and its Subsidiaries directly or
          indirectly in connection with such Disposition; provided that (i) such
          Net Available Proceeds shall be net of (x) the amount of any legal,
          title and recording tax expenses, commissions and other reasonable
          fees and expenses (including reasonable expenses of preparing the
          relevant property for sale) paid by Terra and its Subsidiaries in
          connection with such Disposition and (y) any Federal, state and local
          income or other taxes estimated in good faith to be payable by Terra
          and its Subsidiaries as a result of such Disposition and (ii) such Net
          Available Proceeds shall be net of any repayments by Terra or any of
          its Subsidiaries of Debt to the extent that (x) such Debt is secured
          by a Lien on the property that is the subject of such Disposition and
          (y) the transferee of (or holder of a Lien on) such property requires
          that such Debt be repaid as a condition to the purchase of such
          property; and

               (b)  in the case of any Casualty Event, the aggregate amount of
          proceeds of insurance, condemnation awards and other compensation
          received by Terra and its Subsidiaries (and, in the case of business
          interruption insurance, not contractually required to be paid over to
          Morgan Stanley Leveraged Equity Fund II, as agent, or its successors
          or assigns) in respect of such Casualty Event net of (A) reasonable
          expenses incurred by Terra and its Subsidiaries in connection
          therewith, (B) contractually required repayments of Debt to the extent
          secured by a Lien on the property suffering such Casualty Event and
          any income and transfer taxes payable by Terra or any of its
          Subsidiaries in respect
<PAGE>
 
                                     - 29 -

          of such Casualty Event and (C) amounts promptly applied to or set
          aside for the repair or replacement of the property suffering such
          Casualty Event; provided that the proceeds of insurance received by
          Terra and its Subsidiaries in connection with the December 13, 1994
          Casualty Event at the Port Neal Facility shall be deemed to be applied
          to the repair or replacement of the Port Neal Facility.
 
          "Net Worth" means, for any Person at any time, the sum of the
     following for such Person and its Subsidiaries on a Consolidated basis:

               (a)  the amount of capital stock; plus

               (b)  the amount of surplus and retained earnings (or, in the case
          of a surplus or retained earnings deficit, minus the amount of such
          deficit).

          "1995 Terra Debt" means Debt incurred by Terra under the 1995 Terra
     Debt Indenture.

          "1995 Terra Debt Indenture" means the Indenture dated as of June 22,
     1995 between Terra and First Trust National Association, as Trustee,
     providing for the issuance of Terra's 10.50% Senior Notes, as from time to
     time amended.

          "1996 Receivables Agreement" means the August 1996 Receivables
     Purchase Agreement among Terra Funding Corporation, as Seller, the Company,
     as initial servicer, the financial institutions party thereto, as
     Purchasers, and Bank of America National Trust and Savings Association, as
     Agent.

          "Note" means a Terra Note or a TNLP Note.

          "Notice of Borrowing" has the meaning specified in Section 2.02(a).

          "Notice of Issuance" has the meaning specified in Section 2.13(b)(i).

          "Obligation" means, with respect to any Person, any obligation of such
     Person of any kind, including, without limitation, any liability of such
     Person on any claim, whether or not the right of any creditor to payment in
     respect of such claim is reduced to judgment, liquidated, unliquidated,
     fixed, contingent, matured, disputed, undisputed, legal, equitable, secured
     or unsecured, and whether or not such claim is discharged, stayed or
     otherwise
<PAGE>
 
                                     - 30 -

     affected by any proceeding referred to in Section 6.01(g). Without limiting
     the generality of the foregoing, the Obligations of the Obligors under the
     Loan Documents include (a) their respective obligations to pay principal,
     interest, Letter of Credit commissions, charges, expenses, fees, attorneys'
     fees and disbursements, indemnities and other amounts payable under any
     Loan Document and (b) their respective obligations to reimburse any amount
     in respect of any of the foregoing that any Lender, in its sole discretion,
     may elect to pay or advance on behalf of such Obligor.

          "Obligors" means the Terra Obligors and the TNLP Obligors.

          "OECD" means the Organization for Economic Cooperation and
     Development.

          "Original Credit Agreement" means the Credit Agreement dated as of
     October 24, 1994 among the Company, Terra and TNLP, as Borrowers, certain
     Guarantors, the "Lenders" and "Issuing Banks" referred to therein and
     Citibank, as Agent.

          "Other Distribution" means a Dividend Payment made with respect to the
     capital stock of the Company except to the extent that the Company
     determines, reasonably and in good faith, that such Dividend Payment (1) is
     made to fund one or more of the items described in the definition of
     "Specified Payments" in this Section 1.01 or (2) is made out of the then-
     available amount of Cumulative Adjusted Net Income.

          "Other Taxes" has the meaning specified in Section 2.11(b).

          "Outside Subsidiary" means any Subsidiary of Terra (other than Terra
     Capital Holdings or any of its Subsidiaries).

          "PBGC" means the Pension Benefit Guaranty Corporation.

          "Permitted Investments" means:

          (a)  direct obligations of the United States of America, or of any
     agency thereof, or obligations guaranteed as to principal and interest by
     the United States of America, or by any agency thereof, in either case
     maturing not more than one year from the date of acquisition thereof;

          (b)  readily marketable direct obligations of the United States of
     America, or of any agency thereof, or
<PAGE>
 
                                     - 31 -

     readily marketable obligations guaranteed as to principal and interest by
     the United States of America, or by any agency thereof, in either case
     maturing not more than three years from the date of acquisition thereof
     (provided that the aggregate amount of Permitted Investments outstanding at
     any time under this paragraph (b) having maturities in excess of one year
     from the date of determination shall not exceed $25,000,000 at any time);

          (c)  readily marketable direct obligations issued by any State of the
     United States of America or any political subdivision thereof or of the
     government of Canada or any agency thereof, in each case maturing not more
     than one year from the date of acquisition thereof and having the highest
     credit rating obtainable from either of Moody's or Standard & Poor's;

          (d)  money market mutual funds (including, without limitation, tax-
     free money market mutual funds) with assets consisting solely of U.S.
     Dollars and securities principally of the types described in paragraphs
     (a), (b) and (c) in this definition;

          (e)  certificates of deposit issued by, repurchase and reverse
     repurchase agreements with, banker's acceptances of, and eurodollar time
     deposits with, any Initial Lender or any bank or trust company organized
     under the laws of the United States of America or any state thereof, having
     capital, surplus and undivided profits of at least $500,000,000 (or any
     national or regional brokerage firm) and whose unsecured, unguaranteed
     long-term senior debt obligations are rated at least A by Standard & Poor's
     and at least A2 by Moody's, maturing not more than 270 days from the date
     of acquisition thereof;

          (f)  obligations of not more than $100,000 in the aggregate at any one
     time of any bank or bank holding company with a capital and surplus of less
     than $500,000,000 or whose unsecured, unguaranteed long-term senior debt
     obligations are rated less than A by Standard & Poor's or less than A2 by
     Moody's;

          (g)  commercial paper and variable rate demand notes, in each case
     rated at least A-1 by Standard & Poor's or at least P-1 by Moody's and
     maturing not more than 270 days from the date of acquisition thereof;

          (h)  tax-exempt auction rate preferred stock and taxable and tax-
     exempt auction rate securities, in each case rated at least AAA by Standard
     & Poor's and Aaa by Moody's
<PAGE>
 
                                     - 32 -

     and maturing not more than 60 days from the date of acquisition thereof;

          (i)  "Liquidity Optimized Guaranteed Investment Contracts" with
     insurance companies having short-term debt ratings of at least A-1 by
     Standard & Poor's and P-1 by Moody's and maturing not more than 30 days
     from the date of acquisition thereof;

          (j)  Canadian dollar-denominated banker's acceptances of Canadian
     banks rated at least R1-mid by Dominion Bond Rating Service ("Dominion")
     and maturing not more than one year from the date of acquisition thereof;
     and

          (k)  Canadian dollar-denominated commercial paper rated at least R1-
     mid by Dominion and maturing not more than one year from the date of
     acquisition thereof; and

          (l)  solely with respect to Terra U.K., (i) British government bonds
     maturing not more than one year from the date of acquisition thereof; (ii)
     money-market funds or composite funds with assets consisting solely of
     Pounds Sterling, high-quality short-term corporate securities and
     securities principally of the type described in clause (i) in this
     paragraph (l); and (iii) funds held in corporate accounts at banks
     organized under the laws of the United Kingdom having capital, surplus and
     undivided profits not less than $350,000,000 or at branches of U.S. banks
     located in the United Kingdom of the quality described in paragraph (e)
     above.

          "Permitted JV" means Britz LLC and Farmland JV.

          "Permitted Liens" means such of the following as to which no
     enforcement, collection, execution, levy or foreclosure proceeding shall
     have been commenced (or, if such a proceeding has been commenced, such
     proceeding is being contested in good faith by appropriate proceedings and
     enforcement of any Lien has been and is stayed):

               (a)  Liens for taxes, assessments and governmental charges or
          levies to the extent not required to be paid under Section 5.01(b),

               (b)  Liens imposed by law, such as materialmen's, mechanics',
          carriers', workmen's and repairmen's Liens, statutory landlord's Liens
          and other similar Liens arising in the ordinary course of business
          securing obligations that are not overdue for a period of more
<PAGE>
 
                                     - 33 -

          than 30 days or which are being contested in good faith and by
          appropriate proceedings,

               (c)  pledges or deposits to secure obligations under workers'
          compensation laws or similar legislation or to secure public or
          statutory obligations,

               (d)  deposits to secure the performance of bids, trade contracts
          (other than for borrowed money), leases (other than capital leases),
          surety and appeal bonds, and performance bonds and other obligations
          of a like nature incurred, in each case arising in the ordinary course
          of business,

               (e)  as to any particular property at any time, such easements,
          encroachments, covenants, rights of way, minor defects, irregularities
          or encumbrances on title which do not materially impair the use of
          such property for the purpose for which it is held by the owner
          thereof,

               (f)  municipal and zoning ordinances that are not violated in any
          material respect by the existing improvements and the present use made
          by the owner thereof, and

               (g)  real estate taxes and assessments not yet delinquent.

          "Permitted Receivables Facilities" means, collectively:

               (a)  the Receivables Purchase Agreement dated as of March 31,
          1994 among TI, as Seller, the financial institutions party thereto, as
          Purchasers, and Bank of America National Trust and Savings
          Association, successor to Continental Bank N.A., as agent, as from
          time to time amended, or any replacement or refinancing thereof; and

               (b)  the 1996 Receivables Agreement and one or more additional
          facilities entered into by the Company and/or any of its Subsidiaries
          (which may be effected by an amendment to the facility referred to in
          clause (a) of this definition or otherwise) providing for the sale of
          Receivables,

     provided that the aggregate amount outstanding under all of the Permitted
     Receivables Facilities (other than Intercompany Receivables Facilities),
     taken together, may
<PAGE>
 
                                     - 34 -

     not at any time exceed $150,000,000 plus reasonable reserves.

          "Person" means an individual, partnership, corporation (including a
     business trust), joint stock company, limited liability company, trust,
     unincorporated association, joint venture or other entity, or a government
     or any political subdivision or agency thereof.

          "Plan" means a Single Employer Plan or a Multiple Employer Plan.

          "Port Neal Facility" means TI's facility in Port Neal, Iowa.

          "Port Neal Transaction" means the "Proposed Transaction" under and as
     defined in the Consent, Waiver and Amendment dated as of July 31, 1995
     relating to the Existing Credit Agreement.

          "Post-Default Rate" means a rate per annum equal to 2% plus the
     Applicable Margin plus the Base Rate as in effect from time to time.

          "Pounds Sterling" and "(Pounds)" means lawful money of the United
     Kingdom.

          "Preferred Stock" means, with respect to any corporation, capital
     stock issued by such corporation that is entitled to a preference or
     priority over any other capital stock issued by such corporation upon any
     distribution of such corporation's assets, whether by dividend or upon
     liquidation.

          "Pro Rata Share" of any amount means, with respect to any Lender under
     any Facility at any time, the product of (a) a fraction the numerator of
     which is the amount of such Lender's Advances under such Facility (or, in
     the case of a Facility prior to the Commitment Termination Date for such
     Facility, the amount of such Lender's Commitment under such Facility), and
     the denominator of which is the aggregate Advances or Commitments, as the
     case may be, under such Facility at such time, multiplied by (b) such
     amount.

          "Purchase Event" means:

               (1)  that during any period commencing January 1, 1995, the
          aggregate amount of Dividend Payments with respect to the capital
          stock of the Company during such period exceeds the sum of:
<PAGE>
 
                                     - 35 -

                    (a) the aggregate amount of Specified Payments for such
               period plus

                    (b) Cumulative Adjusted Net Income for such period plus

                    (c) the amounts available during such period for Restricted
               Transactions under Section 5.02(h)(A) (provided that this clause
               (c) shall be determined, with respect to all periods prior to the
               Restatement Date, as provided in the Existing Credit Agreement)
               to the extent not utilized for Restricted Transactions during
               such period; or

          (2)  that:

               (A)  Liens on or with respect to any property of the Company or
          any of its Subsidiaries have been created in favor of Terra or any of
          its Subsidiaries, other than Liens permitted under any of clauses (i)
          through (xix) of Section 5.02(a); or

               (B)  the Company or any of its Subsidiaries has any outstanding
          Debt owing to Terra or any of its Subsidiaries, other than Debt
          permitted to be outstanding under any of clauses (i) through (ix) of
          Section 5.02(b)(2); or

               (C)  the Company or any of its Subsidiaries has sold, transferred
          or otherwise disposed of any of its property to Terra or any of its
          Subsidiaries, other than sales, transfers or other dispositions
          permitted under any of clauses (i) through (xi) of Section 5.02(e); or

               (D)  the Company or any of its Subsidiaries has made any
          Investments in Terra or any of its Subsidiaries, other than
          Investments permitted under any of clauses (i) through (xxiii) of
          Section 5.02(f).

          "Quarterly Dates" means March 31, June 30, September 30 and December
     31 in each year, the first of which shall be the first such day after the
     Restatement Date, provided that, if any such day is not a Business Day, the
     relevant Quarterly Date shall be the immediately preceding Business Day.

          "Receivables" means accounts and notes receivable and, in each case,
     related reserves.
<PAGE>
 
                                     - 36 -

          "Receivables Subsidiary" means a Subsidiary of the Company that meets
     both of the following criteria:

               (1)  such Subsidiary is formed solely for the purpose of, and is
          engaged solely in the business of, (x) purchasing Receivables of the
          Company and one or more of its Subsidiaries under an Intercompany
          Receivables Facility and, at its option, selling all or a portion of
          such Receivables under a Permitted Receivables Facility and/or (y)
          owning the capital stock of, or other ownership interests in, one or
          more Receivables Subsidiaries; and

               (2)  all of the capital stock of and/or other ownership interests
          in, such Subsidiary (other than, in the case of a Subsidiary of the
          Company that is an obligor or a seller under a Permitted Receivables
          Facility, shares of preferred stock of such Subsidiary having a de
          minimis liquidation value, which preferred shares may be held by one
          or more financial institutions party to such Permitted Receivables
          Facility or their designees, including one or more individuals, and
          their successors) is owned beneficially and of record, directly or
          indirectly, by Terra Capital Holdings, the Company and/or one or more
          other Receivables Subsidiaries.

          "Redeemable" means any capital stock, Debt or other right or
     Obligation that (a) the issuer thereof has undertaken to redeem at a fixed
     or determinable date or dates prior to the Terra Commitment Termination
     Date hereunder, whether by operation of a sinking fund or otherwise, or
     upon the occurrence of a condition not solely within the control of the
     issuer or (b) is redeemable on any date prior to the Terra Commitment
     Termination Date at the option of the holder thereof.  For purposes of this
     Agreement, the BMLP Class A Limited Partnership Interest shall not be
     deemed to be "Redeemable".

          "Reference Banks" means Citibank, Bank of America National Trust and
     Savings Association, NationsBank, N.A. and The Bank of Nova Scotia (or
     their respective Applicable Lending Offices, as the case may be).

          "Register" has the meaning specified in Section 9.07(c).

          "Regulation G", "Regulation U" and "Regulation X" mean Regulations G,
     U and X of the Board of Governors of the
<PAGE>
 
                                     - 37 -

     Federal Reserve System, respectively, as in effect from time to time.

          "Required Lenders" means at any time Lenders owed or holding in the
     aggregate at least 51% of the sum of the then aggregate unpaid principal
     amount of the Advances, the then aggregate Unused Commitments and the
     aggregate Available Amount of all Letters of Credit.  For purposes of this
     definition, the Available Amount of each Letter of Credit shall be
     considered to be owed to the relevant Lenders according to their respective
     Pro Rata Shares of the Facility under which such Letter of Credit has been
     issued.

          "Restatement Date" has the meaning assigned to such term in Section
     3.01.

          "Restricted Transactions" means, collectively, Capital Expenditures
     and Specified Acquisitions.

          "Retiring Lender" means each "Lender" under the Existing Credit
     Agreement identified under the caption "RETIRING LENDERS" on the signature
     pages hereof.

          "Rolling Period" means any period of four consecutive fiscal quarters
     of Terra.

          "Sale of Business Agreement" means the Sale of Business Agreement
     relating to the ICI Fertilizer Business dated November 20, 1997 between
     ICI, Terra U.K. and Terra providing for the U.K. Nitrogen Acquisition, as
     from time to time amended (without prejudice to Section 5.02(l)).

          "Second Restatement Date" means December 14, 1995.
 
          "Security Documents" means the Holdings Pledge Agreement, the Terra
     Capital Pledge Agreement, the Subsidiary Pledge and Security Agreement, the
     TNLP Pledge and Security Agreement, each security agreement or other grant
     of security now or hereafter made by any Obligor to secure any of the
     Obligations hereunder and under the other Loan Documents, and all Uniform
     Commercial Code financing statements required by this Agreement or any of
     the foregoing to be filed with respect to the security interests in
     personal property created pursuant thereto.

          "Senior Financial Officer" means the Chief Financial Officer of Terra.

          "Senior Preference Units" means, collectively, (a) the "Senior
     Preference Units" issued and outstanding under, and
<PAGE>
 
                                     - 38 -

     as defined in, the Agreement of Limited Partnership dated as of December 4,
     1991 of TNCLP, as such Agreement of Limited Partnership is in effect on the
     Restatement Date, and (b) the "Common Units" into which such Senior
     Preference Units have been converted in accordance with Section 5.5 of such
     Agreement of Limited Partnership.

          "Single Employer Plan" of any Person means a single employer plan, as
     defined in Section 4001(a)(15) of ERISA, that is subject to Title IV of
     ERISA and that (a) is maintained for employees or former employees of such
     Person or any of its ERISA Affiliates and no Person other than such Person
     and its ERISA Affiliates or (b) was so maintained and in respect of which
     such Person or any of its ERISA Affiliates has or would have liability
     under Section 4069 of ERISA in the event such plan has been or were to be
     terminated.

          "Solvent" and "Solvency" mean, with respect to any Person on a
     particular date, that on such date (a) the fair value of the property of
     such Person is greater than the total amount of liabilities, including,
     without limitation, contingent liabilities, of such Person, (b) the present
     fair salable value of the assets of such Person is not less than the amount
     that will be required to pay the probable liability of such Person on its
     debts as they become absolute and matured, (c) such Person does not intend
     to, and does not believe that it will, incur debts or liabilities beyond
     such Person's ability to pay as such debts and liabilities mature and (d)
     such Person is not engaged in business or a transaction, and is not about
     to engage in business or a transaction, for which such Person's property
     would constitute an unreasonably small capital.

          "Specified Acquisitions" means Investments (including, without
     limitation, Investments arising by reason of any merger or consolidation
     permitted under Sections 5.02(d)(i)(y) and 5.02(d)(ii)(y), but excluding
     the Excluded Transactions) consisting of acquisitions of ownership
     interests in one or more entities engaged in the same or allied line or
     lines of business as Terra and its Subsidiaries, taken as a whole.  For
     purposes hereof, the amount of Specified Acquisitions made during any
     period shall include, without duplication, the aggregate amount of
     Investments in Permitted JVs (other than Investments referred to in clauses
     (xvi) and (xviii)(y) of Section 5.02(f)) made during such period and the
     aggregate amount of payments made during such period by Terra and its
     Subsidiaries in respect of the Obligations referred to in clauses (xiv),
     (xv), (xvi) and (xvii) of Section 5.02(b)(1).
<PAGE>
 
                                     - 39 -

          "Specified Call Option" means a cash-settled call option with respect
     to a U.S. Stock Index, which call option (a) has an expiration date not
     later than March 31, 1998, (b) is entered into with a counterparty (or
     designated guarantor) having (at the time of acquisition thereof) senior,
     unsecured long-term debt rated at least BBB by Standard & Poor's and Baa2
     by Moody's and (c) is documented under an agreement that permits close-out
     and netting of all call options thereunder.

          "Specified Payments" means, for any period, (a) all interest due and
     payable on the AMCI Senior Notes and on the 1995 Terra Debt during such
     period, (b) all scheduled dividends payable during such period on
     convertible Preferred Stock or other equity securities issued and applied
     to prepay the Advances (to the extent the Commitments hereunder are reduced
     simultaneously with such issuance), (c) ordinary and necessary expenses
     incurred by Terra as a result of its operations as a publicly-held holding
     company and (d) other payments in an aggregate amount up to $5,000,000 per
     year to the extent required under pre-existing obligations.

          "SPU Redemption" means the purchase, redemption or other acquisition
     from time to time of all or a portion of the outstanding Senior Preference
     Units by Terra and its Subsidiaries (or any of them):

               (a)  on such terms and conditions as could not reasonably be
          expected to have a Material Adverse Effect; and

               (b)  in accordance in all material respects with the terms and
          conditions hereof.

          "SPU Redemption Time" means the time as of which all of the Senior
     Preference Units shall have been purchased or otherwise redeemed pursuant
     to the SPU Redemption.

          "Standard & Poor's" means Standard & Poor's Ratings Services, a
     division of The McGraw-Hill Companies, Inc., and its successors.

          "Subordinated Indebtedness" means Debt of Terra or any of its
     Subsidiaries the payment of which is subordinated in right of payment to
     the prior payment in full of the Advances.

          "Subsidiary" of any Person means any corporation, partnership, joint
     venture, limited liability company, trust
<PAGE>
 
                                     - 40 -

     or estate of which (or in which) more than 50% of (a) the issued and
     outstanding capital stock having ordinary voting power to elect a majority
     of the board of directors of such corporation (irrespective of whether at
     the time capital stock of any other class or classes of such corporation
     shall or might have voting power upon the occurrence of any contingency),
     (b) the interest in the capital or profits of such partnership, joint
     venture or limited liability company or (c) the beneficial interest in such
     trust or estate is at the time directly or indirectly owned or controlled
     by such Person, by such Person and one or more of its other Subsidiaries or
     by one or more of such Person's other Subsidiaries.  For all purposes of
     this Agreement and the other Loan Documents, BMLP and each of BMLP's
     Subsidiaries shall be deemed to be Subsidiaries of the Company so long as
     TMC or one of TMC's Subsidiaries is the sole general partner of BMLP.

          "Subsidiary Guarantor" means, collectively, (x) TNC, BMCH, TMC and TI,
     (y) prior to the BMLP Restructuring Time, BMLP and (z) from and after the
     SPU Redemption Time, TNLP and its successors.

          "Subsidiary Pledge and Security Agreement" means an Amended and
     Restated Pledge and Security Agreement in the form of Exhibit B-3 between
     certain of the Guarantors and the Collateral Agent, as from time to time
     amended.

          "Terra" means Terra Industries Inc., a Maryland corporation and an
     indirect parent of the Company.

          "Terra Advance" means an Advance made or outstanding pursuant to
     Section 2.01(a).

          "Terra Borrowing" means a borrowing consisting of simultaneous Terra
     Advances of the same Type.

          "Terra Canada" means Terra International (Canada) Inc., a corporation
     governed by the laws of Ontario and an indirect wholly owned Subsidiary of
     the Company.

          "Terra Canada Credit Facility" means the Credit Agreement dated as of
     December 31, 1997 among Terra Canada, the lenders party thereto and
     Citibank, as administrative agent for said lenders, providing for term
     loans to be made to Terra Canada in an aggregate principal amount equal to
     $125,000,000 having a tenor of five years and one day, as from time to time
     amended.
<PAGE>
 
                                     - 41 -

          "Terra Canada Group" means, collectively, Terra Canada and its
     Subsidiaries, and a "member" of the Terra Canada Group means, individually,
     Terra Canada and each such Subsidiary.

          "Terra Capital Holdings" means Terra Capital Holdings, Inc., a
     Delaware corporation and the direct parent of the Company.

          "Terra Capital Note" has the meaning assigned to such term in Section
     5.02(b)(2)(iii).

          "Terra Capital Pledge Agreement" means an Amended and Restated Pledge
     Agreement in the form of Exhibit B-2 between the Company and the Collateral
     Agent, as from time to time amended.

          "Terra Commitment" has the meaning specified in Section 2.01(a).

          "Terra Commitment Reduction Dates" shall mean the Quarterly Dates
     falling on or nearest to December 31 of each year, commencing with December
     31, 1998, through and including December 31, 2000.

          "Terra Commitment Termination Date" means the earlier of (a) December
     31, 2000 (provided that if such day is not a Business Day, the Terra
     Commitment Termination Date shall be the immediately preceding Business
     Day), and (b) the termination or cancellation of the Terra Commitments
     pursuant to the terms of this Agreement.

          "Terra Facility" means the revolving credit facility provided
     hereunder in respect of the Terra Commitments.

          "Terra Guaranteed Obligations" has the meaning specified in Section
     8.01.

          "Terra Guarantors" means, collectively, (x) Terra, Terra Capital
     Holdings, TNC, TI, BMCH and TMC, (y) prior to the BMLP Restructuring Time,
     BMLP and (z) from and after the SPU Redemption Time, TNLP and its
     successors.

          "Terra L/C Cash Collateral Account" means one or more cash collateral
     accounts maintained by the Administrative Agent with Citibank for the
     benefit of the Lenders and Issuing Banks.

          "Terra Letter of Credit" means a letter of credit issued by an Issuing
     Bank for account of the Company or any
<PAGE>
 
                                     - 42 -

     of its Subsidiaries (other than, prior to the SPU Redemption Time, TNLP or
     any of its Subsidiaries) pursuant to Section 2.13(a).

          "Terra Letter of Credit Commitment" means, with respect to any Issuing
     Bank at any time, the amount set forth opposite such Issuing Bank's name on
     Schedule 2.01 under the caption "Terra Letter of Credit Commitment", as
     such amount may be reduced pursuant to Section 2.04.

          "Terra Letter of Credit Liability" means, as of any date of
     determination, all of the liabilities of the Company to the Issuing Banks
     in respect of Terra Letters of Credit, whether such liability is contingent
     or fixed, and shall consist of the sum of (a) the aggregate Available
     Amount of all Terra Letters of Credit then outstanding, plus (b) the
     aggregate amount that has then been paid by, and has not been reimbursed
     to, any Issuing Bank under Terra Letters of Credit.

          "Terra Letter of Credit Sublimit" means (a) prior to the SPU
     Redemption Time, $30,000,000 and (b) from and after the SPU Redemption
     Time, $45,000,000.

          "Terra Note" means a promissory note of the Company payable to the
     order of a Lender, in substantially the form of Exhibit A-1, as from time
     to time amended.

          "Terra Obligors" means the Terra Guarantors and the Company.

          "Terra Stock Repurchase" means the purchase, redemption, retirement or
     other acquisition of shares of common stock of Terra.

          "Terra U.K." means Terra Nitrogen (U.K.) Limited, a corporation formed
     under the laws of England and a wholly owned Subsidiary of Terra Canada.

          "Terra U.K. Holdings" means Terra (U.K.) Holdings, Inc., a Delaware
     corporation and a direct Subsidiary of BMLP.

          "Terra U.K. Loan" has the meaning specified in Section 5.02(b)(2)(iv).

          "Terra U.K. Loan Agreement" means the credit agreement, loan
     agreement, promissory note or other agreement providing for the Terra U.K.
     Loan, as from time to time amended.
<PAGE>
 
                                     - 43 -

          "Terra U.K. Offtake Agreement" means, collectively, one or more
     nitrogen products offtake agreements between the Company and Terra U.K.
     entered into in connection with the BMLP Restructuring, as from time to
     time amended.
 
          "TI" means Terra International, Inc., a Delaware corporation and a
     wholly owned Subsidiary of the Company.

          "TMC" means Terra Methanol Corporation, a Delaware corporation.

          "TNC" means Terra Nitrogen Corporation, a Delaware corporation and a
     wholly owned Subsidiary of the Company.

          "TNCLP" means Terra Nitrogen Company, L.P., a Delaware limited
     partnership and a Subsidiary of the Company.

          "TNLP Advance" means an Advance made or outstanding pursuant to
     Section 2.01(b).

          "TNLP Borrowing" means a borrowing consisting of simultaneous TNLP
     Advances of the same Type.

          "TNLP L/C Cash Collateral Account" means one or more cash collateral
     accounts maintained by the Administrative Agent with Citibank for the
     benefit of the Lenders and Issuing Banks.

          "TNLP Commitment" has the meaning specified in Section 2.01(b).

          "TNLP Commitment Termination Date" means the earliest of (a) December
     31, 2000 (provided that if such day is not a Business Day, the TNLP
     Commitment Termination Date shall be the immediately preceding Business
     Day), (b) the termination or cancellation of the TNLP Commitments pursuant
     to the terms of this Agreement, and (c) the date on which the SPU
     Redemption Time occurs.

          "TNLP Facility" means the revolving credit facility provided hereunder
     in respect of the TNLP Commitments.

          "TNLP Guaranteed Obligations" has the meaning specified in Section
     8.01.

          "TNLP Guarantors" means, collectively, (x) Terra, Terra Capital
     Holdings, the Company, TNC, TI, TMC and BMCH and (y) prior to the BMLP
     Restructuring Time, BMLP.
<PAGE>
 
                                     - 44 -

          "TNLP Letter of Credit" means a letter of credit issued by an Issuing
     Bank for account of TNLP or any of its Subsidiaries pursuant to Section
     2.13(a).

          "TNLP Letter of Credit Commitment" means, with respect to any Issuing
     Bank at any time, the amount set forth opposite such Issuing Bank's name on
     Schedule 2.01 under the caption "TNLP Letter of Credit Commitment", as such
     amount may be reduced pursuant to Section 2.04.

          "TNLP Letter of Credit Liability" means, as of any date of
     determination, all of the liabilities of TNLP to the Issuing Banks in
     respect of TNLP Letters of Credit, whether such liability is contingent or
     fixed, and shall consist of the sum of (a) the aggregate Available Amount
     of all TNLP Letters of Credit then outstanding, plus (b) the aggregate
     amount that has then been paid by, and has not been reimbursed to, any
     Issuing Bank under TNLP Letters of Credit.

          "TNLP Letter of Credit Sublimit" means $15,000,000.

          "TNLP Note" means a promissory note of TNLP payable to the order of a
     Lender, in substantially the form of Exhibit A-2, as from time to time
     amended.

          "TNLP Obligors" means the TNLP Guarantors and TNLP.

          "TNLP Pledge and Security Agreement" means an Amended and Restated
     Pledge and Security Agreement in the form of Exhibit B-4 between TNLP and
     the Collateral Agent, as from time to time amended.

          "Type" refers to the distinction between Advances bearing interest at
     the Base Rate and Advances bearing interest at the Eurodollar Rate.

          "U.K. Nitrogen Acquisition" has the meaning specified in the
     Preliminary Statements to this Agreement.

          "U.K. Nitrogen Assets" means the "Assets", as defined in the Sale of
     Business Agreement.

          "U.K. Nitrogen MAC" means a deterioration in the aggregate value of
     the U.K. Nitrogen Assets of 10% or more in the period from November 20,
     1997 to the Restatement Date.
<PAGE>
 
                                     - 45 -

          "Unused Commitment" means, at any time, the aggregate amount of all
     Lenders' Unused Terra Commitments at such time and all Lenders' Unused TNLP
     Commitments at such time.

          "Unused Terra Commitment" means, with respect to any Lender at any
     time, (a) such Lender's Terra Commitment at such time minus (without
     duplication) (b) the sum of (i) the aggregate outstanding principal amount
     of all Terra Advances made by such Lender and (ii) such Lender's Pro Rata
     Share of the aggregate Available Amount of all Terra Letters of Credit
     outstanding at such time and of all unreimbursed drawings thereunder.

          "Unused TNLP Commitment" means, with respect to any Lender at any
     time, (a) such Lender's TNLP Commitment at such time minus (without
     duplication) (b) the sum of (i) the aggregate outstanding principal amount
     of all TNLP Advances made by such Lender and (ii) such Lender's Pro Rata
     Share of the aggregate Available Amount of all TNLP Letters of Credit
     outstanding at such time and of all unreimbursed drawings thereunder.

          "U.S. Dollars" and "$" means lawful money of the United States of
     America.

          "U.S. Stock Index" means a nationally-recognized diversified index of
     equity securities (which may relate to a single industry) of companies that
     are predominantly domiciled or doing business in the United States.

          Section 1.02.  Computation of Time Periods.  In this Agreement in the
computation of periods of time from a specified date to a later specified date,
the word "from" means "from and including" and the words "to" and "until" mean
"to but excluding".

          Section 1.03.  Accounting Terms.  All accounting terms not
specifically defined herein shall be construed in accordance with GAAP.
<PAGE>
 
                                    - 46 -

                                  ARTICLE II

                       AMOUNTS AND TERMS OF THE ADVANCES
                           AND THE LETTERS OF CREDIT

          Section 2.01.  The Advances.

          (a)  Terra Facility.

          (i)  Each Lender severally agrees, on the terms and conditions
     hereinafter set forth, to make advances ("Terra Advances") to the Company
     from time to time on any Business Day during the period from the
     Restatement Date until the Terra Commitment Termination Date in an
     aggregate amount at any one time outstanding not to exceed the amount set
     forth opposite such Lender's name on Schedule 2.01 under the caption "Terra
     Commitment" or, if such Lender has entered into one or more Assignments and
     Acceptances, set forth for such Lender in the Register as such Lender's
     "Terra Commitment" (such amount being such Lender's "Terra Commitment"),
     and, as to all Lenders, in an aggregate amount at any one time outstanding
     not to exceed $350,000,000 (provided that at all times prior to the SPU
     Redemption Time the aggregate amount of the Terra Commitments shall be
     deemed to be reduced for all purposes hereof by the aggregate amount of the
     TNLP Commitments as in effect from time to time).

          On the Restatement Date, all outstanding "Terra Advances" of each
     Lender under the Existing Credit Agreement shall automatically, without any
     action on the part of any Person, be deemed to be Terra Advances hereunder;
     and each Initial Lender (if any) whose relative proportion of the Terra
     Commitments hereunder is increasing over the proportion of "Terra
     Commitment" held by it under the Existing Credit Agreement shall, by
     assignments from the other Initial Lenders (which shall be deemed to occur
     automatically on the Restatement Date), acquire a portion of the Terra
     Advances of the Initial Lenders so designated in such amounts (and the
     Initial Lenders shall, through the Administrative Agent, make such
     additional adjustments among themselves as shall be necessary) so that on
     the Restatement Date, after giving effect to such assignments and
     adjustments, the Initial Lenders shall hold the Terra Advances hereunder
     ratably in accordance with their respective Terra Commitments. On the
     Restatement Date, the Company will repay the "Terra Advances" held by each
     Retiring Lender under (and as defined in) the Existing Credit Agreement and
     all accrued fees and other amounts payable with respect thereto and, upon
     such repayment, each

 
<PAGE>
 
                                     - 47 -

     Retiring Lender shall cease to be a Lender for all purposes of this
     Agreement and the other Basic Documents.

          On the Restatement Date all Interest Periods under the Existing Credit
     Agreement in respect of the "Terra Advances" under and as defined in the
     Existing Credit Agreement shall automatically be terminated, and, subject
     to the provisions of Section 2.01(c), the Company shall be permitted to
     Continue such "Terra Advances" as Eurodollar Rate Advances hereunder, or to
     Convert such "Terra Advances" into Base Rate Advances hereunder.

          The aggregate principal amount of the Terra Advances of each Lender as
     of the Restatement Date shall be the amount set forth opposite such
     Lender's name on Schedule 2.01 under the caption "Terra Advances".

         (ii)  The Terra Advances shall be made by the Lenders ratably according
     to their respective Terra Commitments.

        (iii)  Within the limits of each Lender's Terra Commitment in effect
     from time to time, the Company may borrow under this Section 2.01(a) and/or
     obtain the issuance of Letters of Credit under Section 2.13, prepay
     pursuant to Section 2.05(a) and reborrow under this Section 2.01(a);
     provided that the aggregate outstanding principal amount of Terra Advances
     when added to the aggregate Terra Letter of Credit Liability may not at any
     time exceed the aggregate amount of the Terra Commitments at such time.

         (iv)  The proceeds of the Terra Advances shall be used solely (A) for
     general corporate purposes of the Company and its Subsidiaries (other than,
     prior to the SPU Redemption Time, TNLP and its successors), including,
     without limitation, to finance the ongoing working capital needs of, and to
     refinance outstanding Debt of, such Persons, (B) to finance all or a
     portion of the SPU Redemption (provided that proceeds of Terra Advances
     used for such purpose shall not exceed $125,000,000 in the aggregate) and
     (C) to finance the purchase, redemption, retirement or other acquisition of
     shares of common stock of Terra.

          (v)  Notwithstanding the foregoing provisions of Section 2.01(a), the
     Company agrees that, for a period of 30 consecutive days during each fiscal
     year it will prepay the Terra Advances in such amounts as shall be
     necessary so the aggregate outstanding principal amount of the Terra
     Advances shall not exceed the Terra Cleanup Amount as in effect at such
     time; provided that this Section 2.01(a)(v) shall not prevent the Company
     from requesting the issuance of Terra
 
<PAGE>
 
                                     - 48 -

     Letters of Credit during any such period pursuant to Section 2.13, or the
     Lenders from making Terra Advances in respect thereof pursuant to Section
     2.13(c), which Terra Advances (subject to the other terms and conditions of
     this Agreement) may remain outstanding during such period.  For purposes
     hereof, "Terra Cleanup Amount" means, at any time during the periods set
     forth in column (A) below, the respective amount set forth for such period
     in column (B) below:

 
                      (A)                                (B)
                     Period                     Terra Cleanup Amount
             ---------------------              ---------------------

         From January 1, 1998 to                     $90,000,000
         December 31, 1998

         From January 1, 1999 to                     $60,000,000
         December 31, 1999

         From and after January 1, 2000              $30,000,000

          (b)  TNLP Facility.

          (i)  Each Lender severally agrees, on the terms and conditions
     hereinafter set forth, to make advances ("TNLP Advances") to TNLP from time
     to time on any Business Day during the period from the Restatement Date
     until the TNLP Commitment Termination Date in an aggregate amount at any
     one time outstanding not to exceed the amount set forth opposite such
     Lender's name on Schedule 2.01 under the caption "TNLP Commitment" or, if
     such Lender has entered into one or more Assignments and Acceptances, set
     forth for such Lender in the Register as such Lender's "TNLP Commitment"
     (such amount being such Lender's "TNLP Commitment"), and, as to all
     Lenders, in an aggregate amount at any one time outstanding not to exceed
     $25,000,000.

          On the Restatement Date, all outstanding "TNLP Advances" of each
     Lender under the Existing Credit Agreement shall automatically, without any
     action on the part of any Person, be deemed to be TNLP Advances hereunder;
     and each Initial Lender (if any) whose relative proportion of the TNLP
     Commitments hereunder is increasing over the proportion of "TNLP
     Commitment" held by it under the Existing Credit Agreement shall, by
     assignments from the other Initial Lenders (which shall be deemed to occur
     automatically on the Restatement Date), acquire a portion of the TNLP
     Advances of the Initial Lenders so designated in such amounts (and the
     Initial Lenders shall, through the Administrative Agent, make such
     additional adjustments among themselves as shall
<PAGE>
 
                                     - 49 -

     be necessary) so that on the Restatement Date, after giving effect to such
     assignments and adjustments, the Initial Lenders shall hold the TNLP
     Advances hereunder ratably in accordance with their respective TNLP
     Commitments.  On the Restatement Date, TNLP will repay the "TNLP Advances"
     held by each Retiring Lender under (and as defined in) the Existing Credit
     Agreement and all accrued fees and other amounts payable with respect
     thereto and, upon such repayment, each Retiring Lender shall cease to be a
     Lender for all purposes of this Agreement and the other Basic Documents.

          On the Restatement Date all Interest Periods under the Existing Credit
     Agreement in respect of the "TNLP Advances" under and as defined in the
     Existing Credit Agreement shall automatically be terminated, and, subject
     to the provisions of Section 2.01(c), TNLP shall be permitted to Continue
     such "TNLP Advances" as Eurodollar Rate Advances hereunder, or to Convert
     such "TNLP Advances" into Base Rate Advances hereunder.

          The aggregate principal amount of the TNLP Advances of each Lender as
     of the Restatement Date shall be the amount set forth opposite such
     Lender's name on Schedule 2.01 under the caption "TNLP Advances".

         (ii)  The TNLP Advances shall be made by the Lenders ratably according
     to their respective TNLP Commitments.

        (iii)  Within the limits of each Lender's TNLP Commitment in effect from
     time to time, TNLP may borrow under this Section 2.01(b) and/or obtain the
     issuance of Letters of Credit under Section 2.13, prepay pursuant to
     Section 2.05(a) and reborrow under this Section 2.01(b); provided that the
     aggregate outstanding principal amount of TNLP Advances when added to the
     aggregate TNLP Letter of Credit Liability may not at any time exceed the
     aggregate amount of the TNLP Commitments at such time.

         (iv)  The proceeds of the TNLP Advances shall be used solely (A) for
     general corporate purposes of TNLP, including, without limitation, to
     finance its ongoing working capital needs and to refinance outstanding Debt
     and (B) to finance all or a portion of the SPU Redemption.

          (c)  Minimum Amounts.  Each Borrowing shall be in an aggregate amount
at least equal to $3,000,000 or an integral multiple of $1,000,000 in excess
thereof.
<PAGE>
 
                                     - 50 -

          (d)  No Responsibility to Third Parties.  Neither the Administrative
Agent nor any Lender nor any Issuing Bank shall have any responsibility as to
the application or use of any of the proceeds of any Advance.

          Section 2.02.  Making the Advances.

          (a)  (i) Except as otherwise provided in Section 2.13, each Borrowing
     shall be made on notice, given not later than 11:00 A.M. (New York City
     time) on the Business Day of (or, with respect to a Borrowing of Eurodollar
     Rate Advances, 10:00 A.M. (New York City time) on the second Business Day
     prior to the date of) the proposed Borrowing, by the relevant Borrower to
     the Administrative Agent, which shall give to each Lender prompt notice
     thereof by telex, telecopier or cable.  Each such notice of a Borrowing (a
     "Notice of Borrowing") shall be by telex, telecopier or cable, confirmed
     immediately in writing, in substantially the form of Exhibit C, specifying
     therein (1) the requested date of such Borrowing, (2) the Facility under
     which such Borrowing is to be made, (3) the requested Type of Advances
     comprising such Borrowing, (4) the requested aggregate amount of such
     Borrowing and (5) in the case of a Borrowing consisting of Eurodollar Rate
     Advances, the requested initial Interest Period for each such Advance.

         (ii)  In the case of a proposed Borrowing comprised of Eurodollar Rate
     Advances, the Administrative Agent shall promptly notify each relevant
     Lender of the applicable interest rate under Section 2.06(a)(ii).

        (iii)  Each Lender shall, before 1:00 P.M. (New York City time) on the
     date of each Borrowing after the Restatement Date, make available for the
     account of its Applicable Lending Office to the Administrative Agent at the
     Administrative Agent's Account, in same day funds, such Lender's ratable
     portion of such Borrowing.  After the Administrative Agent's receipt of
     such funds and upon fulfillment of the applicable conditions set forth in
     Article III, the Administrative Agent will transfer same day funds to the
     relevant Borrower's Account; provided that (i) in the case of any Terra
     Borrowing, the Administrative Agent shall first make a portion of such
     funds equal to any unreimbursed drawing under any Terra Letter of Credit
     available to each Issuing Bank having issued any such Letter of Credit for
     reimbursement of such drawing, and (ii) in the case of any TNLP Borrowing,
     the Administrative Agent shall first make a portion of such funds equal to
     any unreimbursed drawing under any TNLP Letter of Credit available to each
<PAGE>
 
                                     - 51 -

     Issuing Bank having issued any such Letter of Credit for reimbursement of
     such drawing.

          (b)  Anything in subsection (a) above to the contrary notwithstanding,
     (i) neither Borrower may select Eurodollar Rate Advances (y) for any
     Borrowing if the aggregate amount of such Borrowing is less than $3,000,000
     or (z) if the obligation of the relevant Lenders to make Eurodollar Rate
     Advances shall then be suspended pursuant to Section 2.08 or 2.09, and (ii)
     Eurodollar Rate Advances may not be outstanding under more than 15 separate
     Interest Periods under either Facility at any one time.

          (c)  Each Notice of Borrowing shall be irrevocable and binding on the
     relevant Borrower.  In the case of any Borrowing that the related Notice of
     Borrowing specifies is to be comprised of Eurodollar Rate Advances, the
     relevant Borrower shall indemnify each relevant Lender against any loss,
     cost or expense incurred by such Lender as a result of any failure to
     fulfill on or before the date specified in such Notice of Borrowing for
     such Borrowing the applicable conditions set forth in Article III,
     including, without limitation, any loss (including loss of anticipated
     profits), cost or expense incurred by reason of the liquidation or
     reemployment of deposits or other funds acquired by such Lender to fund the
     Advance to be made by such Lender as part of such Borrowing when such
     Advance, as a result of such failure, is not made on such date.

          (d)  Unless the Administrative Agent shall have received notice from a
     relevant Lender prior to 12:00 Noon (New York City time) on the date of any
     Borrowing that such Lender will not make available to the Administrative
     Agent such Lender's ratable portion of such Borrowing, the Administrative
     Agent may assume that such Lender has made such portion available to the
     Administrative Agent on the date of such Borrowing in accordance with
     Section 2.02(a) and the Administrative Agent may, in reliance upon such
     assumption, make available to the relevant Borrower on such date a
     corresponding amount.  If and to the extent that such Lender shall not have
     so made such ratable portion available to the Administrative Agent and the
     Administrative Agent shall have made available such corresponding amount to
     the relevant Borrower, such Lender and the relevant Borrower severally
     agree to repay to the Administrative Agent forthwith on demand such
     corresponding amount together with interest thereon, for each day from the
     date such amount is made available to the relevant Borrower until the date
     such amount is repaid to the Administrative Agent, at (i) in the case of
     the relevant Borrower, the interest rate applicable
<PAGE>
 
                                     - 52 -

     at such time under Section 2.06 to Advances comprising such Borrowing and
     (ii) in the case of such Lender, the Federal Funds Rate.  If such Lender
     shall repay to the Administrative Agent such corresponding amount, such
     amount so repaid shall constitute such Lender's Advance as part of such
     Borrowing for purposes of this Agreement.

          (e)  The failure of any Lender to make the Advance to be made by it as
     part of any Borrowing shall not relieve any other Lender of its obligation,
     if any, hereunder to make its Advance on the date of such Borrowing, but no
     Lender shall be responsible for the failure of any other Lender to make the
     Advance to be made by such other Lender on the date of any Borrowing.

          Section 2.03.  Repayment.

          (a)  Terra Advances.  The Company hereby promises to pay to the
Administrative Agent for the account of each Lender the full outstanding
principal amount of the Terra Advances of such Lender on the Terra Commitment
Termination Date.  In addition, if following any Terra Commitment Reduction Date
the aggregate principal amount of the Terra Advances, together with the
aggregate amount of all Terra Letter of Credit Liabilities, shall exceed the
Terra Commitments, the Company shall, first, pay Advances and, second, provide
cover for Terra Letter of Credit Liabilities in the manner specified in Section
2.05(d)) in an aggregate amount equal to such excess.

          (b)  TNLP Advances.  TNLP hereby promises to pay to the Administrative
Agent for the account of each Lender the full outstanding principal amount of
the TNLP Advances of such Lender on the TNLP Commitment Termination Date.

          (c)  All Advances.  All repayments of principal under this Section
2.03 shall be made together with interest accrued to the date of such repayment
on the principal amount repaid.

          Section 2.04.  Termination or Reduction of the Commitments.

          (a)  Optional.  The Borrowers may at any time or from time to time,
upon not less than two Business Days' notice to the Administrative Agent,
terminate in whole or reduce in part the Commitments under the relevant
Facility, provided that (i) each partial reduction of the Commitments under such
Facility shall be in an aggregate amount of $5,000,000 or an integral multiple
of $1,000,000 in excess thereof, and (ii) the aggregate amount of the
Commitments under either Facility shall not be reduced below the Letter of
Credit Commitment for such Facility.
<PAGE>
 
                                     - 53 -

          (b)  Mandatory -- Terra Commitments.  The Terra Commitments shall be
automatically and permanently reduced to zero on the Terra Commitment
Termination Date.  In addition, the aggregate amount of the Terra Commitments
shall be automatically reduced on each Terra Commitment Reduction Date set forth
in column (A) below to the amount set forth in column (B) below opposite such
Terra Commitment Reduction Date:

                        (A)                       (B)
                       Terra                     Terra
                Commitment Reduction      Commitments Reduced
                 Date Falling on or         to the Following
                    Nearest to:               Amounts ($)
                --------------------      -------------------
                December 31, 1998            $330,000,000
                December 31, 1999            $310,000,000

          (c)  Mandatory -- TNLP Commitments.  The TNLP Commitments shall be
automatically and permanently reduced to zero on the TNLP Commitment Termination
Date.

          (d)  Reductions Pro Rata.  Each reduction of the Commitments under a
Facility shall be applied to the respective Commitments of the Lenders according
to their respective Pro Rata Shares of such Facility.

          (e)  General.  Commitments once terminated or reduced may not be
reinstated.

          Section 2.05.  Prepayments, Etc.

          (a)  Optional Prepayments.  (i) Either Borrower may, upon at least two
     Business Days' notice (in the case of prepayment of Eurodollar Rate
     Advances) or upon notice given on the date of prepayment (in the case of
     prepayments of Base Rate Advances) to the Administrative Agent (which
     notice shall state the Facilities to be prepaid and the proposed date and
     aggregate principal amount of the prepayment), and if such notice is given
     such Borrower shall, prepay the outstanding principal amount of the
     Advances under the specified Facilities in the aggregate amount and on the
     date specified in such notice, together with accrued interest to the date
     of such prepayment on the principal amount prepaid; provided that (x) each
     partial prepayment shall be in an aggregate principal amount of $3,000,000
     or an integral multiple of $1,000,000 in excess thereof, (y) any such
     prepayment of a Eurodollar Rate Advance other than on the last day of the
     Interest Period therefor shall be accompanied by, and subject to, the
     payment of any amount payable under Section 9.04(c) in
<PAGE>
 
                                     - 54 -

     respect of such prepayment and (z) each such notice shall be made on the
     relevant day not later than, in the case of prepayments of Eurodollar Rate
     Advances, 10:00 A.M. (New York City time) and, in the case of prepayments
     of Base Rate Advances, 12:00 Noon (New York City time).

          (ii)  Each prepayment of Advances under this Section 2.05(a) shall be
     made for account of the relevant Lenders according to their respective Pro
     Rata Shares of the principal amount of the Advances then outstanding under
     the relevant Facility.

          (b)  Mandatory Prepayments; Commitment Reductions.

          (i)  Sale of Assets.  Without limiting the obligation of the Company
     to obtain the consent of the Required Lenders pursuant to Section 5.02(e)
     to any Disposition not otherwise permitted hereunder, on the first
     anniversary of each Disposition the Company shall prepay the Terra Advances
     (and/or provide cover for Terra Letter of Credit Liabilities as specified
     in Section 2.05(d)), and the Terra Commitments shall be subject to
     automatic reduction, in an aggregate amount equal to (A) 75% of the Net
     Available Proceeds of such Disposition minus (B) the amount of such Net
     Available Proceeds theretofore invested or committed to be invested in the
     business of the Company and its Subsidiaries; provided that (x) for
     purposes of this clause (i) the aggregate Net Available Proceeds of all
     such Dispositions in a fiscal year shall be deemed to be reduced by
     $25,000,000 (but shall not be deemed to be less than zero) and (y) the
     following shall not be deemed to be Dispositions for purposes of this
     clause (i):

               (1)  the sale by the Company or any of its Subsidiaries of
          Receivables under an Intercompany Receivables Facility or under a
          Permitted Receivables Facility;

               (2)  the transfer of the Blytheville Assets in accordance with
          Section 5.02(e)(viii);

               (3)  the BMLP Restructuring;

               (4)  the sale of any property by any member of the Terra Canada
          Group;

               (5)  from and after the BMLP Restructuring Time, the sale of any
          property by any member of the BMLP  Group;
<PAGE>
 
                                     - 55 -

               (6)  the transactions under the Terra U.K. Offtake Agreement;

               (7)  the transactions relating to the construction of the Ammonia
          Loop; and

               (8)  the transactions under the Ammonium Nitrate Hedging
          Agreement.

          (ii)  Casualty Events.  Upon the date 360 days following the receipt
     by Terra or any of its Subsidiaries (other than members of the Terra Canada
     Group and, from and after the BMLP Restructuring Time, members of the BMLP
     Group) of the proceeds of insurance, condemnation award or other
     compensation in respect of any Casualty Event affecting any property of
     Terra or any of its Subsidiaries, the Company shall prepay the Terra
     Advances (and/or provide cover for Terra Letter of Credit Liabilities as
     specified in Section 2.05(d)), and the Terra Commitments shall be subject
     to automatic reduction, in an aggregate amount, if any, equal to (A) 75% of
     the Net Available Proceeds of such Casualty Event not theretofore applied
     to the repair or replacement of such property or set aside for such purpose
     minus (B) the amount of such Net Available Proceeds theretofore invested or
     committed to be invested in the business of the Company and its
     Subsidiaries.  Nothing in this clause (ii) shall be deemed to limit any
     obligation of Terra or any of its Subsidiaries pursuant to any of the
     Security Documents to remit to a collateral or similar account (including,
     without limitation, a Collateral Account under and as defined in the
     Security Documents) maintained by the Collateral Agent pursuant to any of
     the Security Documents the proceeds of insurance, condemnation award or
     other compensation received in respect of any Casualty Event.

          (c)  Application.  On the dates specified in clauses (i) and (ii) of
Section 2.05(b), the Terra Commitments shall be reduced automatically in an
aggregate amount equal to the amount specified in such paragraphs (and to the
extent that, after giving effect to such reduction, the aggregate principal
amount of Terra Advances and Terra Letter of Credit Liabilities would exceed the
Terra Commitments, the Company shall, first, prepay Terra Advances and, second,
provide cover for Terra Letter of Credit Liabilities as specified in paragraph
(d) below, in an aggregate amount equal to such excess).

          (d)  Cover for Terra Letter of Credit Liabilities.  In the event that
the Company shall be required pursuant to Section 2.03(a) or Section 2.05(b) to
provide cover for Terra
<PAGE>
 
                                     - 56 -

Letter of Credit Liabilities, the Company shall effect the same by paying to the
Administrative Agent same day funds in an amount equal to the required amount,
which funds shall be deposited in the Terra L/C Cash Collateral Account until
such time as the Terra Letters of Credit shall have been terminated and all of
the Terra Letter of Credit Liabilities paid in full.

          (e)  Payments with Interest.  All prepayments under this Section 2.05
shall be made together with accrued interest to the date of such prepayment on
the principal amount prepaid.

          Section 2.06.  Interest.

          (a)  Ordinary Interest.  The Company shall pay interest on the unpaid
principal amount of each Terra Advance owing to each Lender from the date of
such Advance until such principal amount shall be paid in full, and TNLP shall
pay interest on the unpaid principal amount of each TNLP Advance owing to each
Lender from the date of such Advance until such principal amount shall be paid
in full, in each case at the following rates per annum:

          (i)  Base Rate Advances.  While such Advance is a Base Rate Advance, a
     rate per annum equal at all times to the sum of (1) the Base Rate in effect
     from time to time plus (2) the Applicable Margin in effect from time to
     time, payable in arrears quarterly on each Quarterly Date and on the date
     such Base Rate Advance shall be Converted (but only on the amount
     Converted) or paid in full.

         (ii)  Eurodollar Rate Advances.  While such Advance is a Eurodollar
     Rate Advance, a rate per annum equal at all times during each Interest
     Period for such Advance to the sum of (1) the Eurodollar Rate for such
     Interest Period for such Advance plus (2) the Applicable Margin in effect
     from time to time, payable in arrears on the last day of such Interest
     Period and, if such Interest Period has a duration of more than three
     months, on each three-month anniversary of the first day of such Interest
     Period occurring during such Interest Period.

          (b)  Post-Default Interest.  If (a) any Obligor shall fail to pay when
due (by acceleration or otherwise) any amount payable under any Loan Document
after any applicable grace period provided in Section 6.01(a), or (b) (i) an
Event of Default shall have occurred and be continuing during any period and
(ii) the Administrative Agent or the Required Lenders, through the
Administrative Agent, shall have notified the Company thereof, each Borrower
shall, notwithstanding anything else in this Agreement to the contrary, pay to
the Administrative Agent for account of each Lender interest, during such
period, at the
<PAGE>
 
                                    - 57 -

applicable Post-Default Rate on any principal of any Advance made by such Lender
to such Borrower, and on any other amount whatsoever then due and payable by
such Borrower hereunder or under the Notes held by such Lender to or for account
of such Lender, such interest to be payable from time to time on demand.

          Section 2.07.  Fees.

          (a)  Commitment Fee. Each Borrower hereby promises to pay to the
Administrative Agent for the account of each Lender a commitment fee (i) in the
case of the Company, on the average daily Unused Terra Commitment of such Lender
and (ii) in the case of TNLP, on the average daily Unused TNLP Commitment of
such Lender, in each case for the period from the Restatement Date (or from the
effective date specified in the Assignment and Acceptance pursuant to which it
became a Lender in the case of each other Lender other than the Initial Lenders)
until the Commitment Termination Date for the relevant Facility at the
Applicable Commitment Fee Rate, payable in arrears (x) quarterly after the
Restatement Date on each Quarterly Date and (y) on the Commitment Termination
Date for the relevant Facility.

          (b)  Letter of Credit Commission, Etc.

          (i)  The Company hereby promises to pay to the Administrative Agent
     (A) for the account of each Issuing Bank a non-refundable fronting fee of
     1/4% per annum of the face amount of each Terra Letter of Credit issued by
     it for the period from the date of issuance thereof until such Letter of
     Credit has been drawn in full, expires or is terminated and (B) for the
     account of each Lender a non-refundable commission on such Lender's Pro
     Rata Share of the average daily aggregate Available Amount of all Terra
     Letters of Credit then outstanding at the Applicable Letter of Credit Fee
     Rate, such fees to be payable in arrears on each Quarterly Date and on the
     Terra Commitment Termination Date and calculated, for any day, after giving
     effect to any payments made under such Letter of Credit on such day.

         (ii)  TNLP hereby promises to pay to the Administrative Agent (A) for
     the account of each Issuing Bank a non-refundable fronting fee of 1/4% per
     annum of the face amount of each TNLP Letter of Credit issued by it for the
     period from the date of issuance thereof until such Letter of Credit has
     been drawn in full, expires or is terminated and (B) for the account of
     each Lender a non-refundable commission on such Lender's Pro Rata Share of
     the average daily aggregate Available Amount of all TNLP Letters of Credit
     then outstanding at the Applicable Letter of Credit Fee Rate, such fees to
     be payable quarterly in arrears on

<PAGE>
 
                                     - 58 -

     each Quarterly Date and on the TNLP Commitment Termination Date and
     calculated, for any day, after giving effect to any payments made under
     such Letter of Credit on such day.

          (c)  Letter of Credit Expenses. Each Borrower shall pay to each
Issuing Bank, for its own account, such commission, issuance fees, transfer fees
and other fees and charges in connection with the issuance or administration of
the Letters of Credit issued by it as such Borrower and such Issuing Bank shall
agree; provided that all fees and other charges payable pursuant to this Section
2.07(c) shall be the customary amounts charged by such Issuing Bank in
connection with the issuance or administration of similar letters of credit and
the amounts so determined shall be adjusted as necessary to avoid a duplicative
payment hereunder.

          Section 2.08.  Conversion and Continuation of Advances.

          (a)  Optional Conversion. Each Borrower may on any Business Day, upon
notice given to the Administrative Agent not later than 10:00 A.M. (New York
City time) on the second Business Day prior to the date of the proposed
Conversion and subject to the provisions of Sections 2.09 and 2.10, Convert all
or any portion of the Advances of one Type outstanding under any Facility (and,
in the case of Eurodollar Rate Advances, having the same Interest Period);
provided that any Conversion of Eurodollar Rate Advances into Base Rate Advances
shall be made only on the last day of an Interest Period for such Eurodollar
Rate Advances, any Conversion of Base Rate Advances into Eurodollar Rate
Advances shall be in an amount not less than the minimum amount specified in
Section 2.02(b)(i) and no Conversion of any Advances shall result in a greater
number of separate Interest Periods in respect of Eurodollar Rate Advances under
any Facility than permitted under Section 2.02(b)(ii). Each such notice of
Conversion shall, within the restrictions specified above, specify (i) the date
of such Conversion, (ii) the aggregate amount, Type and Facility of the Advances
(and, in the case of Eurodollar Rate Advances, the Interest Period therefor) to
be Converted and (iii) if such Conversion is into Eurodollar Rate Advances, the
duration of the initial Interest Period for such Advances. Each notice of
Conversion shall be irrevocable and binding on the relevant Borrower.

          (b)  Certain Mandatory Conversions.

          (i)  On the date on which the aggregate unpaid principal amount of
     Eurodollar Rate Advances comprising any Borrowing shall be reduced, by
     payment or prepayment or otherwise, to less than $3,000,000 such Advances
     shall automatically Convert into Base Rate Advances.
<PAGE>
 
                                     - 59 -

          (ii)   If a Borrower shall fail to select the duration of any Interest
     Period for any outstanding Eurodollar Rate Advances in accordance with the
     provisions contained in the definition of "Interest Period" in Section 1.01
     and in clause (a) or (c) of this Section 2.08, the Administrative Agent
     will forthwith so notify such Borrower and the relevant Lenders, whereupon
     each such Eurodollar Rate Advance will automatically, on the last day of
     the then existing Interest Period therefor, Convert into a Base Rate
     Advance.

          (iii)  Upon the occurrence and during the continuance of any Event of
     Default and upon notice from the Administrative Agent to the Borrowers at
     the request of the Required Lenders, (x) each Eurodollar Rate Advance will
     automatically, on the last day of the then existing Interest Period
     therefor, Convert into a Base Rate Advance and (y) the obligation of the
     Lenders to make, or to Convert Advances into, or to Continue, Eurodollar
     Rate Advances shall be suspended.

            (c)  Continuations. Each Borrower may, on any Business Day, upon
notice given to the Administrative Agent not later than 10:00 A.M. (New York
City time) on the second Business Day prior to the date of the proposed
Continuation and subject to the provisions of Sections 2.09, Continue all or any
portion of the Eurodollar Rate Advances outstanding under a relevant Facility
having the same Interest Period as such Eurodollar Rate Advances; provided that
any such Continuation shall be made only on the last day of an Interest Period 
for such Eurodollar Rate Advances, any Continuation of Eurodollar Rate Advances 
shall be in an amount not less than the minimum Borrowing amount specified in 
Section 2.02(b)(i) and no Continuation of any Eurodollar Rate Advances shall 
result in a greater number of separate Interest Periods in respect of Eurodollar
Rate Advances under any Facility than permitted under Section 2.02(b)(ii). Each 
such notice of Continuation shall, within the restrictions specified above,
specify (i) the date of such Continuation, (ii) the aggregate amount and
Facility of, and the Interest Period for, the Advances being Continued and (iii)
the duration of the initial Interest Period for the Eurodollar Rate Advances
subject to such Continuation. Each notice of Continuation shall be irrevocable
and binding on the relevant Borrower.

          Section 2.09.  Increased Costs, Illegality, Etc.

          (a)  If, due to either (i) the introduction of or any change in or in
the interpretation of (to the extent any such introduction or change occurs 
after the date hereof) any law or regulation or (ii) the compliance with any 
guideline or request
<PAGE>
 
                                    - 60 -

from any central bank or other governmental authority adopted or made after the
date hereof (whether or not having the force of law), there shall be any
increase in the cost to any Lender of agreeing to make or making, funding or
maintaining Eurodollar Rate Advances under any Facility, then the relevant
Borrower shall from time to time, upon demand by such Lender (with a copy of
such demand to the Administrative Agent), pay to the Administrative Agent for
the account of such Lender additional amounts sufficient to compensate such
Lender for such increased cost; provided that, before making any such demand,
each Lender agrees to use reasonable efforts (consistent with its internal
policy and legal and regulatory restrictions) to designate a different
Applicable Lending Office if the making of such a designation would avoid the
need for, or reduce the amount of, such increased cost and would not, in the
reasonable judgment of such Lender, be otherwise disadvantageous to such Lender.
A certificate as to the amount of such increased cost, submitted to the relevant
Borrower by such Lender, shall be conclusive and binding for all purposes,
absent manifest error.

            (b)  If any Lender determines in good faith that compliance with any
law or regulation enacted or introduced after the date hereof or any guideline
or request from any central bank or other governmental authority adopted or made
after the date hereof (whether or not having the force of law) affects or would
affect the amount of capital required or expected to be maintained by such
Lender or any corporation controlling such Lender and that the amount of such
capital is increased by or based upon the existence of such Lender's commitment
to lend hereunder and other commitments of this type or the issuance of the
Letters of Credit (or similar contingent obligations), then, upon demand by such
Lender (with a copy of such demand to the Administrative Agent), each Borrower
shall pay to the Administrative Agent for the account of such Lender, from time
to time as specified by such Lender, additional amounts sufficient to compensate
such Lender in the light of such circumstances, to the extent that such Lender
reasonably determines such increase in capital to be allocable to the existence
of such Lender's commitment to lend hereunder or to the issuance or maintenance
of any Letters of Credit. A certificate as to such amounts submitted to the
relevant Borrower by such Lender, shall be conclusive and binding for all
purposes, absent manifest error.

            (c)  If, with respect to any Eurodollar Rate Advances, (i) the
Required Lenders reasonably determine and notify the Administrative Agent that
the Eurodollar Rate for any Interest Period for such Advances will not
adequately reflect the cost to such Required Lenders of making, funding or
maintaining their respective Eurodollar Rate Advances for such Interest Period,
or (ii) if fewer than two Reference Banks furnish timely information
<PAGE>
 
                                    - 61 -

to the Administrative Agent for determining the Eurodollar Rate for any
Eurodollar Rate Advances, the Administrative Agent shall forthwith so notify the
Borrowers and the Lenders, whereupon (x) each Eurodollar Rate Advance will
automatically, on the last day of any then existing Interest Period therefor,
Convert to a Base Rate Advance, and (y) the obligation of the Lenders to make,
or to Convert Advances into, or to Continue, Eurodollar Rate Advances shall be
suspended until the Administrative Agent shall notify the Borrowers and such
Lenders that the circumstances causing such suspension no longer exist.

            (d)  Notwithstanding any other provision of this Agreement, if the
introduction of or any change in or in the interpretation of (to the extent any
such introduction or change occurs after the date hereof) any law or regulation
shall make it unlawful, or any central bank or other governmental authority
having appropriate jurisdiction shall assert in writing that it is unlawful, for
any Lender or its Eurodollar Lending Office to perform its obligations hereunder
to make Eurodollar Rate Advances or to continue to fund or maintain Eurodollar
Rate Advances hereunder, then, on notice thereof and demand therefor by such
Lender to the Borrowers through the Administrative Agent, (i) each Eurodollar
Rate Advance of such Lender will automatically, upon such demand, Convert to a
Base Rate Advance and (ii) the obligation of such Lender to make, or to Convert
Advances into, or to Continue, Eurodollar Rate Advances shall be suspended until
the Administrative Agent shall notify the Borrowers that such Lender has
determined that the circumstances causing such suspension no longer exist;
provided that, before making any such demand, such Lender agrees to use
reasonable efforts (consistent with its internal policy and legal and regulatory
restrictions) to designate a different Eurodollar Lending Office if the making
of such a designation would allow such Lender or its Eurodollar Lending Office
to continue to perform its obligations to make Eurodollar Rate Advances or to
continue to fund or maintain Eurodollar Rate Advances and would not, in the
judgment of such Lender, be otherwise disadvantageous to such Lender.

            (e)  Neither Borrower shall be obligated to pay any additional
amounts arising pursuant to clauses (a) and (b) of this Section 2.09 that are
attributable to the Excluded Period with respect to such additional amount;
provided that if an applicable law, rule, regulation, guideline or request shall
be adopted or made on any date and shall be applicable to the period (a
"Retroactive Period") prior to the date on which such law, rule, regulation,
guideline or request is adopted or made, the limitation on the Borrowers'
obligations to pay such additional amounts hereunder shall not apply to the
additional amounts payable in respect of such Retroactive Period.
<PAGE>
 
                                    - 62 -

          Section 2.10.  Payments and Computations.
                         ------------------------- 
          (a) Each Borrower shall make each payment hereunder and under the
Notes not later than 12:00 Noon (New York City time) on the day when due in U.S.
Dollars to the Administrative Agent at the Administrative Agent's Account in
same day funds and, except as expressly set forth herein, without deduction, 
set-off or counterclaim. The Administrative Agent will promptly thereafter cause
to be distributed like funds relating to the payment of principal or interest or
commitment fees under or in respect of a particular Facility ratably (other than
amounts payable pursuant to Section 2.09(a), 2.09(b), 2.11, 2.13(d) or 9.04(c),
or amounts payable to an Issuing Bank in respect of Letters of Credit) to the
relevant Lenders for the account of their Applicable Lending Offices, and like
funds relating to the payment of any other amount payable to any Lender to such
Lender for the account of its Applicable Lending Office, in each case to be
applied in accordance with the terms of this Agreement. Upon its acceptance of
an Assignment and Acceptance and recording of the information contained therein
in the Register pursuant to Section 9.07(d), from and after the effective date
of such Assignment and Acceptance, the Administrative Agent shall make all
payments hereunder and under the Notes in respect of the interest assigned
thereby to the Lender assignee thereunder, and the parties to such Assignment
and Acceptance shall make all appropriate adjustments in such payments for
periods prior to such effective date directly between themselves.

          (b) If the Administrative Agent receives funds for application to the
Obligations under the Basic Documents under circumstances for which the Basic
Documents do not specify the Advances or the Facility to which, or the manner in
which, such funds are to be applied, and neither Borrower has otherwise directed
how such funds are to be applied (which direction is consistent with the terms
of the Basic Documents), the Administrative Agent may, but shall not be
obligated to, elect to distribute such funds to each Lender ratably in
accordance with such Lender's proportionate share of the principal amount of all
outstanding Advances and the Available Amount of all Letters of Credit then
outstanding, in repayment or prepayment of such of the outstanding Advances or
other Obligations owed to such Lender, and for application to such principal
installments, as the Administrative Agent shall direct.

          (c) Each Borrower hereby authorizes each Lender, if and to the extent
payment owed to such Lender is not made when due hereunder or under any Note
held by such Lender, to charge from time to time against any or all of such
Borrower's accounts with such Lender any amount so due (with notice to the

<PAGE>
 
                                    - 63 -

Administrative Agent and the relevant Borrower promptly following such charge).

          (d)  Each Reference Bank agrees to furnish to the Administrative Agent
timely information for the purpose of determining each Eurodollar Rate. If any
one or more of the Reference Banks shall not furnish such timely information to
the Administrative Agent for the purpose of determining any such interest rate,
the Administrative Agent shall determine such interest rate on the basis of
timely information furnished by the remaining Reference Banks.

          (e)  All computations of interest, fees and Letter of Credit
commissions shall be made by the Administrative Agent on the basis of a year of
360 days, in each case for the actual number of days (including the first day
but excluding the last day) occurring in the period for which such interest,
fees or commissions are payable. Each determination by the Administrative Agent
of an interest rate, fee or commission hereunder made in accordance with the
provisions of this Agreement shall be conclusive and binding for all purposes,
absent manifest error.

          (f)  Whenever any payment hereunder or under the Notes shall be stated
to be due on a day other than a Business Day, such payment shall be made on the
next succeeding Business Day, and such extension of time shall in such case be
included in the computation of payment of interest or commitment fee, as the
case may be; provided that, if such extension would cause payment of interest on
or principal of Eurodollar Rate Advances to be made in the next following
calendar month, such payment shall be made on the immediately preceding Business
Day.
          (g)  Unless the Administrative Agent shall have received notice from a
Borrower prior to the date on which any payment is due to any Lender hereunder
that such Borrower will not make such payment in full, the Administrative Agent
may assume that such Borrower has made such payment in full to the
Administrative Agent on such date and the Administrative Agent may, in reliance
upon such assumption, cause to be distributed to each such Lender on such due
date an amount equal to the amount then due such Lender. If and to the extent
such Borrower shall not have so made such payment in full to the Administrative
Agent, each such Lender shall repay to the Administrative Agent forthwith on
demand such amount distributed to such Lender together with interest thereon,
for each day from the date such amount is distributed to such Lender until the
date such Lender repays such amount to the Administrative Agent, at the Federal
Funds Rate.
<PAGE>
 
                                     - 64 -

          Section 2.11.  Taxes.
                         ----- 
          (a)  Any and all payments by each Obligor hereunder or under the
relevant Notes shall be made, in accordance with Section 2.10, free and clear of
and without deduction for any and all present or future taxes, levies, imposts,
deductions, charges or withholdings, and all liabilities with respect thereto,
excluding, in the case of each Issuing Bank, each Lender and the Administrative
Agent, net income taxes that are imposed by the United States and franchise
taxes and net income taxes that are imposed on such Issuing Bank, such Lender or
the Administrative Agent by the state or foreign jurisdiction under the laws of
which such Issuing Bank, such Lender or the Administrative Agent (as the case
may be) is organized or any political subdivision thereof and, in the case of
such Issuing Bank and each Lender, franchise taxes and net income taxes that are
imposed on it by the state or foreign jurisdiction of such Issuing Bank's or
such Lender's Applicable Lending Office or any political subdivision thereof
(all such non-excluded taxes, levies, imposts, deductions, charges, withholdings
and liabilities being hereinafter referred to as "Taxes"). If an Obligor shall
be required by law to deduct any Taxes from or in respect of any sum payable
hereunder or under any Note to any Issuing Bank, any Lender or the
Administrative Agent, (i) the sum payable shall be increased as may be necessary
so that after making all required deductions (including deductions applicable to
additional sums payable under this Section 2.11) such Issuing Bank, such Lender
or the Administrative Agent (as the case may be) receives an amount equal to the
sum it would have received had no such deductions been made, (ii) such Obligor
shall make such deductions and (iii) such Obligor shall pay the full amount
deducted to the relevant taxation authority or other authority in accordance
with applicable law.

          (b)  In addition, each Obligor agrees to pay any present or future
stamp or documentary taxes or any other excise or property taxes, charges or
similar levies that arise from any payment made by it hereunder or under the
Notes or from the execution, delivery or registration of this Agreement or the
Notes (hereinafter referred to as "Other Taxes").

          (c)  Each Obligor will indemnify each Issuing Bank, each Lender and
the Administrative Agent for the full amount of Taxes or Other Taxes (including,
without limitation, any Taxes or Other Taxes imposed by any jurisdiction on
amounts payable under this Section 2.11) paid by such Issuing Bank, such Lender
or the Administrative Agent (as the case may be) and any liability (including
penalties, additions to tax, interest and expenses) arising therefrom or with
respect thereto. This indemnification shall be made within 30 days from such
date such Issuing Bank,

<PAGE>
 
                                    - 65 -

such Lender or the Administrative Agent (as the case may be) makes written
demand therefor.

          (d)  Within 30 days after the date of any payment of Taxes, each
Obligor will furnish to the Administrative Agent, at its address referred to in
Section 9.02, appropriate evidence of payment thereof. If such Obligor shall
make a payment hereunder or under the Notes through an account or branch outside
the United States, or a payment is made on behalf of such Obligor by a payor
that is not a United States Person, such Obligor will, if no taxes are payable
in respect of such payment, furnish, or will cause such payor to furnish, to the
Administrative Agent, at such address, a certificate from the appropriate taxing
authority or authorities, or an opinion of counsel acceptable to the
Administrative Agent, in either case stating that such payment is exempt from or
not subject to Taxes. For purposes of this subsection (d) and subsection (e),
the terms "United States" and "United States Person" shall have the meanings
specified in Section 7701 of the Internal Revenue Code.

          (e)  Each Lender organized under the laws of a jurisdiction outside
the United States shall, on or prior to the date of its execution and delivery
of this Agreement (in the case of each Initial Lender) and on the date of the
Assignment and Acceptance pursuant to which it became a Lender (in the case of
each other Lender), and from time to time thereafter if requested in writing by
either Borrower or the Administrative Agent (but only so long as such Lender
remains lawfully able to do so after the date such Lender becomes a Lender
hereunder), provide the Administrative Agent and the Borrowers with either (i)
Internal Revenue Service form 1001 or 4224, as appropriate, or any successor
form prescribed by the Internal Revenue Service, certifying that such Lender is
entitled to benefits under an income tax treaty to which the United States is a
party that reduces the rate of withholding tax on payments under this Agreement
and the Notes or certifying that the income receivable pursuant to this
Agreement and the Notes is effectively connected with the conduct of a trade or
business in the United States or (ii) Internal Revenue Service form W-8, upon
which each Borrower is entitled to rely, from a Lender that has not at the time
such Lender becomes a Lender hereunder been named in any notice issued by the
Secretary of the Treasury (or such Secretary's authorized delegate) pursuant to
Sections 881(c)(2)(B) or 871(h)(5) of the Internal Revenue Code, or any
successor form or statement prescribed by the Internal Revenue Service in order
to establish that such Lender is entitled to treat the interest payments under
this Agreement and the Notes as portfolio interest that is exempt from
withholding tax under the Internal Revenue Code, together with a certificate
stating that such Lender is not described in Section 881(c)(3) of the Internal
Revenue Code. If the form

<PAGE>
 
                                    - 66 -

provided by a Lender at the time such Lender first becomes a party to this
Agreement indicates a United States interest withholding tax rate in excess of
zero (or if the Lender cannot provide at such time such form because it is not
entitled to reduced withholding under a treaty, the payments are not effectively
connected income and the payments do not qualify as portfolio interest),
withholding tax at such rate (or at the then existing U.S. statutory rate if the
Lender cannot provide the form) shall be excluded from Taxes unless and until
such Lender provides the appropriate form certifying that a lesser rate applies,
whereupon withholding tax at such lesser rate only shall be excluded from Taxes
for periods governed by such form; provided that, if at the date of the
Assignment and Acceptance pursuant to which a Lender assignee becomes a party to
this Agreement, the Lender assignor was entitled to payments under subsection
(a) in respect of United States withholding tax with respect to interest paid at
such date, then, to the extent such tax results in liability for such payments,
the term Taxes shall include (in addition to withholding taxes that may be
imposed in the future or other amounts otherwise includable in Taxes) United
States interest withholding tax, if any, applicable with respect to the Lender
assignee on such date.

          (f)  For any period with respect to which a Lender has failed to
provide the Borrowers and the Administrative Agent with the appropriate form
described in Section 2.11(e) (other than if such failure is due to a change in
law occurring after the date on which a form originally was required to be
provided or if such form otherwise is not required under subsection (e)), such
Lender shall not be entitled to indemnification under subsection (a) or (c) with
respect to Taxes imposed by the United States.

          (g)  Any Lender or any Issuing Bank claiming any additional amounts
payable pursuant to this Section 2.11 shall use reasonable efforts (consistent
with its internal policy and legal and regulatory restrictions) to change the
jurisdiction of its Applicable Lending Office(s) if the making of such a change
would avoid the need for, or reduce the amount of, any such additional amounts
that may thereafter accrue and would not, in the reasonable judgment of such
Lender or Issuing Bank, be otherwise disadvantageous to such Lender or Issuing
Bank.
          (h)  Without prejudice to the survival of any other agreement of the
Borrowers hereunder, the agreements and obligations of the Borrowers contained
in this Section 2.11 shall survive the payment in full of principal and interest
hereunder and under the Notes.

          Section 2.12. Sharing of Payments, Etc. If any Lender shall obtain any
payment (whether voluntary, involuntary, through

<PAGE>
 
                                    - 67 -

the exercise of any right of set-off, or otherwise) on account of the Advances
owing to it under any Facility (other than pursuant to Section 2.09(a), 2.09(b),
2.11, 2.13(d) or 9.04(c), or payments to an Issuing Bank in respect of Letters
of Credit) in excess of its ratable share of payments on account of the Advances
under such Facility obtained by all the relevant Lenders, such Lender shall
forthwith purchase from the other relevant Lenders such participations in the
Advances under such Facility owing to them as shall be necessary to cause such
purchasing Lender to share the excess payment ratably with each of them;
provided that if all or any portion of such excess payment is thereafter
recovered from such purchasing Lender, such purchase from each relevant Lender
shall be rescinded and such Lender shall repay to the purchasing Lender the
purchase price to the extent of such recovery together with an amount equal to
such Lender's ratable share (according to the proportion of (i) the amount of
such Lender's required repayment to (ii) the total amount so recovered from the
purchasing Lender) of any interest or other amount paid or payable by the
purchasing Lender in respect of the total amount so recovered.  Each Borrower
agrees that any Lender so purchasing a participation from another Lender
pursuant to this Section 2.12 may, to the fullest extent permitted by law,
exercise all its rights of payment (including the right of set-off) with respect
to such participation as fully as if such Lender were the direct creditor of
such Borrower in the amount of such participation.

          Section 2.13.  Letters of Credit.
                         ----------------- 
          (a)  Issuance of Letters of Credit, Etc.  Each Borrower may request
one or more Issuing Banks to issue, on the terms and conditions hereinafter set
forth, letters of credit for the account of such Borrower under its respective
Facility (letters of credit so issued under the Terra Facility being herein
called "Terra Letters of Credit" and letters of credit so issued under the TNLP
Facility being herein called "TNLP Letters of Credit"; the Terra Letters of
Credit and the TNLP Letters of Credit being collectively called the "Letters of
Credit") from time to time on any Business Day during the period from the
Restatement Date until the date 90 days prior to the Commitment Termination Date
under the relevant Facility; provided that:

          (i)  the Terra Commitments shall be utilized under this Section 2.13
     solely for the issuance of Terra Letters of Credit for the account of the
     Company and, to the extent specified by the Company, any of its
     Subsidiaries (other than, prior to the SPU Redemption Time, TNLP or any of
     its Subsidiaries);
<PAGE>
 
                                    - 68 -

         (ii)  the TNLP Commitments shall be utilized under this Section 2.13
     solely for the issuance of TNLP Letters of Credit for the account of TNLP
     and, to the extent specified by TNLP, any of its Subsidiaries;

        (iii)  the aggregate Available Amount of all Letters of Credit issued by
     all Issuing Banks under either Facility shall not exceed at any time the
     Letter of Credit Sublimit for such Facility, and the aggregate outstanding
     principal amount of all Advances under such Facility when added to the
     aggregate amount of Letter of Credit Liabilities under such Facility shall
     not exceed the aggregate Commitments of the relevant Lenders under such
     Facility on such Business Day;

         (iv)  the aggregate amount of all Letter of Credit Liabilities under
     Letters of Credit issued by any Issuing Bank under either Facility shall
     not exceed at any time the Letter of Credit Commitment of such Issuing Bank
     for such Facility; and

          (v)  no Letter of Credit shall have an expiration date later than, or
     shall permit the account party or the beneficiary to require the renewal
     thereof to a date beyond, the date 30 days prior to the Commitment
     Termination Date for the relevant Facility.

On the Restatement Date, all outstanding "Terra Letters of Credit" outstanding
under the Existing Credit Agreement (the "Existing Terra Letters of Credit")
shall automatically, without any action on the part of any Person, be deemed to
be Terra Letters of Credit hereunder for all purposes of this Agreement.  On the
Restatement Date, all outstanding "TNLP Letters of Credit" outstanding under the
Existing Credit Agreement (the "Existing TNLP Letters of Credit") shall
automatically, without any action on the part of any Person, be deemed to be
TNLP Letters of Credit hereunder for all purposes of this Agreement.  At the SPU
Redemption Time, all outstanding TNLP Letters of Credit shall automatically,
without any action on the part of any Person, be deemed to be Terra Letters of
Credit hereunder for all purposes of this Agreement.  On each day during the
period commencing with the issuance by an Issuing Bank of any Terra Letter of
Credit (or, in the case of any Existing Terra Letter of Credit, during the
period commencing with the Restatement Date) and until such Letter of Credit
shall have been drawn in full or expired or been terminated, the Terra
Commitment of each Lender shall be deemed to be utilized for all purposes of
this Agreement in an amount equal to such Lender's Pro Rata Share of the then
undrawn amount of such Letter of Credit.  On each day during the period
commencing with the issuance by an Issuing Bank of any TNLP               
<PAGE>
 
                                    - 69 -

Letter of Credit (or, in the case of any Existing TNLP Letter of Credit, during
the period commencing with the Restatement Date) and until such Letter of Credit
shall have been drawn in full or expired or been terminated, the TNLP Commitment
of each Lender shall be deemed to be utilized for all purposes of this Agreement
in an amount equal to such Lender's Pro Rata Share of the then undrawn amount of
such Letter of Credit.

          (b)  Request for Issuance.
               -------------------- 

          (i)  Each Letter of Credit shall be issued upon notice, given not
     later than 1:00 P.M. (New York City time) two Business Days prior to the
     date of the proposed issuance of such Letter of Credit, by the relevant
     Borrower to the relevant Issuing Bank, which shall give to the
     Administrative Agent and each Lender prompt notice thereof by telex or
     telecopier.  Each such notice of issuance of a Letter of Credit (a "Notice
     of Issuance") shall be by telex or telecopier, confirmed promptly in
     writing, specifying therein (A) the requested date of such issuance (which
     shall be a Business Day), (B) the Available Amount requested for such
     Letter of Credit, (C) the expiration date of such Letter of Credit, (D) the
     account party or parties for such Letter of Credit, (E) the name and
     address of the issuer and the beneficiary of such Letter of Credit, and (F)
     the form of such Letter of Credit, together with a description of the
     nature of the transactions or obligations proposed to be supported thereby.
     If the requested form of such Letter of Credit is acceptable to such
     Issuing Bank in its discretion, such Issuing Bank will, upon fulfillment of
     the applicable conditions set forth in Article III, make such Letter of
     Credit available to the relevant Borrower at its office referred to in
     Section 9.02 or as otherwise agreed with such Borrower in connection with
     such issuance.

          (ii)  Each Issuing Bank shall furnish (A) to the Administrative Agent
     on the first Business Day of each week a written report summarizing the
     issuance and expiration dates of Letters of Credit issued by such Issuing
     Bank during the previous week and drawings during such week under all
     Letters of Credit issued by such Issuing Bank, (B) to each Lender and to
     the relevant Borrower on the first Business Day of each month, a written
     report summarizing the issuance and expiration dates of the Letters of
     Credit issued by such Issuing Bank under the relevant Facility during the
     preceding month and drawings during such month under all Letters of Credit
     under such Facility issued by the Issuing Bank and (C) to the
     Administrative Agent and each Lender on the first Business Day of each
     calendar quarter, a written report setting forth the average daily


          
<PAGE>
 
                                    - 70 -

     aggregate Available Amount during the preceding calendar quarter of all
     Letters of Credit issued by such Issuing Bank under the relevant Facility.

          (c)  Drawing and Reimbursement.
               ------------------------- 

          (i)  The payment by an Issuing Bank of a draft drawn under any Letter
     of Credit shall constitute for all purposes of this Agreement the making by
     such Issuing Bank of an advance to the relevant Borrower in the amount of
     such payment, which the relevant Borrower agrees to repay on demand and, if
     not paid on demand, shall bear interest, from the date demanded to the date
     paid in full (and which interest shall be payable on demand), (x) from and
     including the date of demand to but not including the second Business Day
     thereafter at the Base Rate in effect for each such day plus the Applicable
     Margin in effect for each such day, and (y) from and including said second
     Business Day thereafter at the Post-Default Rate.  Without limiting the
     obligations of such Borrower hereunder, upon demand by such Issuing Bank
     through the Administrative Agent, each Lender having a Commitment under the
     relevant Facility shall make Advances under such Facility in an aggregate
     amount equal to the amount of such Lender's Pro Rata Share of such advance
     by making available for the account of its Applicable Lending Office to the
     Administrative Agent for the account of such Issuing Bank, by deposit to
     the Administrative Agent's Account, in same day funds, an amount equal to
     the sum of (A) its Pro Rata Share of the outstanding principal amount of
     such advance plus (B) interest accrued and unpaid to and as of such date on
     the outstanding principal amount of such advance.

          (ii)  Each Lender agrees to make such Advances on the Business Day on
     which demand therefor is made by the relevant Issuing Bank through the
     Administrative Agent (provided that notice of such demand is given not
     later than 12:00 Noon (New York City time) on such Business Day) or (if
     notice of such demand is given after such time) the first Business Day next
     succeeding such demand.

          (iii)  If and to the extent that any relevant Lender shall not have so
     made the amount of such Advance available to the Administrative Agent for
     account of such Issuing Bank, such Lender agrees to pay to the
     Administrative Agent forthwith on demand such amount together with interest
     thereon, for each day from the date of demand by the relevant Issuing Bank
     until the date such amount is paid to the Administrative Agent, at the
     Federal Funds Rate.

    
<PAGE>
 
                                    - 71 -

          (iv)  The Advances provided for in this Section 2.13 shall be made by
     the Lenders irrespective of whether there has occurred and is continuing
     any Default or Event of Default or of whether any other condition precedent
     specified in Article III has not been satisfied, and the obligation of each
     Lender under each relevant Facility to make such Advances is absolute and
     unconditional.

          (d)  Increased Costs.
               --------------- 

          (i) If any change in any law or regulation or in the interpretation
     thereof (to the extent any such change occurs after the date hereof) by any
     court or administrative or governmental authority charged with the
     administration thereof shall either (x) impose, modify or deem applicable
     any reserve, special deposit or similar requirement against letters of
     credit or guarantees issued by, or assets held by, or deposits in or for
     the account of, any Issuing Bank or any Lender or (y) impose on any Issuing
     Bank or any Lender any other condition regarding this Agreement or such
     Issuing Bank or such Lender or any Letter of Credit, and the result of any
     event referred to in the preceding clause (x) or (y) shall be to increase
     the cost to such Issuing Bank or Lender of issuing or maintaining any
     Letter of Credit or any commitment hereunder in respect of Letters of
     Credit, then, upon demand by such Issuing Bank or such Lender, the
     Borrowers shall immediately pay to such Issuing Bank or such Lender, from
     time to time as specified by such Issuing Bank or such Lender, additional
     amounts that shall be sufficient to compensate such Issuing Bank or such
     Lender for such increased cost.  A certificate as to the amount of such
     increased cost, submitted to the Borrowers by such Issuing Bank or such
     Lender shall be conclusive and binding for all purposes, absent manifest
     error.

         (ii)  Neither Borrower shall be obligated to pay any additional amounts
     arising pursuant to this Section 2.13(d) that are attributable to the
     Excluded Period with respect to such additional amounts; provided that if
     an applicable law, rule, regulation, guideline or request shall be adopted
     or made on any date and shall be applicable to the period (a "Retroactive
     Period") prior to the date on which such law, rule, regulation, guideline
     or request is adopted or made, the limitation on either Borrower's
     obligation to pay such additional amounts hereunder shall not apply to the
     additional amounts payable in respect of such Retroactive Period.

          (e)  Obligations Absolute.  The Obligations of each Borrower under
this Agreement and any other agreement or
<PAGE>
 
                                     - 72 -

instrument relating to any Letter of Credit (as hereafter amended, supplemented
or otherwise modified from time to time, collectively, the "L/C Related
Documents") shall, to the extent permitted by law, be unconditional and
irrevocable, and shall be paid strictly in accordance with the terms of such L/C
Related Document under all circumstances, including, without limitation, the
following circumstances:

          (i)  any lack of validity or enforceability of any one or more of such
     other documents and agreements, including, but not limited to, the L/C
     Related Documents;

         (ii)  any change in the time, manner or place of payment of, or in any
     other term of, all or any of the Obligations of such Borrower in respect of
     any L/C Related Document or any other amendment or waiver of or any consent
     to departure from all or any of the L/C Related Documents;

        (iii)  the existence of any claim, set-off, defense or other right that
     such Borrower may have at any time against any beneficiary or any
     transferee of a Letter of Credit (or any Persons for whom any such
     beneficiary or any such transferee may be acting), any Issuing Bank or any
     other Person, whether in connection with the transactions contemplated by
     the L/C Related Documents or any unrelated transaction;

         (iv)  any statement or any other document presented under a Letter of
     Credit proving to be forged, fraudulent, invalid or insufficient in any
     respect or any statement therein being untrue or inaccurate in any respect;

          (v)  payment by an Issuing Bank under a Letter of Credit against
     presentation of a draft or certificate that does not comply with the terms
     of such Letter of Credit, except to the extent that such payment resulted
     from such Issuing Bank's willful misconduct or gross negligence in
     determining whether such draft or certificate complies on its face with the
     terms of such Letter of Credit;

         (vi)  any exchange, release or nonperfection of any Collateral or other
     collateral, or any release or amendment or waiver of or consent to
     departure from any guarantee, for all or any of the Obligations of such
     Borrower in respect of the L/C Related Documents; or

        (vii)  any other circumstance or happening whatsoever, whether or not
     similar to any of the foregoing, including, without limitation, any other
     circumstance that might
 
<PAGE>
 
                                     - 73 -

     otherwise constitute a defense available to, or a discharge of, such
     Borrower or a guarantor.

          Section 2.14.  Replacement of Lender.

          (a)  Subject to clause (c) below, in the event that any Lender
requests compensation pursuant to Section 2.09(a), 2.09(b) or 2.13(d), or the
obligation of any Lender to make, or to Convert Base Rate Advances into, or to
Continue, Eurodollar Rate Advances shall be suspended pursuant to Section
2.09(c) or 2.09(d) (such Lender being herein called an "Affected Lender"), then,
so long as such condition exists, the Borrowers may, after the date 30 days
after the date of such request or suspension, either:

            (i)  (x) designate an Eligible Assignee acceptable to the
     Administrative Agent and each Issuing Bank (which acceptance will not be
     unreasonably withheld) that is not an Affiliate of the Borrowers (such
     Eligible Assignee being herein called a "Replacement Lender") to assume the
     Affected Lender's Commitments and other obligations hereunder and to
     purchase the Affected Lender's Advances and other rights under the Loan
     Documents (all without recourse to or representation or warranty by, or
     expense to, the Affected Lender) for a purchase price equal to the
     aggregate principal amount of the outstanding Advances held by the Affected
     Lender plus all accrued but unpaid interest on such Advances and accrued
     but unpaid fees owing to the Affected Lender (and upon such assumption,
     purchase and substitution, and subject to the execution and delivery to the
     Administrative Agent by the Replacement Lender of documentation
     satisfactory to the Administrative Agent and compliance with the
     requirements of Section 9.07(c), the Replacement Lender shall succeed to
     the rights and obligations of the Affected Lender hereunder and the other
     Loan Documents), and (y) pay to the Affected Lender all amounts payable to
     such Affected Lender under Section 9.04(c), calculated as if the purchase
     by the Replacement Lender constituted a mandatory prepayment of Advances by
     the Borrowers, and (z) pay to the Administrative Agent the processing and
     recordation fee specified in Section 9.07(a)(vi) with respect to such
     assignment; or

           (ii)  (x) terminate the Commitments of the Affected Lender and (y)
     pay to the Affected Lender the aggregate principal amount of the
     outstanding Advances held by the Affected Lender plus all accrued but
     unpaid interest on such Advances and accrued but unpaid fees owing to the
     Affected Lender plus all amounts payable to the Affected Lender under
     Section 9.04(c) as a result of such prepayment.
<PAGE>
 
                                     - 74 -

In the event that the Borrowers exercise their rights under the preceding
sentence, the Affected Lender shall no longer be a party hereto or have any
rights or obligations hereunder or under the other Loan Documents; provided that
the obligations of the Borrowers to the Affected Lender under Sections 2.09,
2.11 and 9.04 with respect to events occurring or obligations arising before or
as a result of such replacement shall survive such exercise.

          (b)  If the Borrowers exercise their rights under clause (a)(ii)
above, the Borrowers may, not later than the date 60 days after such exercise,
designate an Eligible Assignee acceptable to the Administrative Agent and each
Issuing Bank (which acceptance will not be unreasonably withheld) that is not an
Affiliate of the Borrowers (such Eligible Assignee being herein called a
"Substitute Lender") to assume Commitments hereunder and to make Advances
hereunder in an amount equal to the respective Commitments and Advances of the
Affected Lender under each of the Facilities and, subject to (x) the execution
and delivery to the Administrative Agent by the Substitute Lender of
documentation satisfactory to the Administrative Agent, (y) the payment by the
Borrowers to the Administrative Agent of the processing and recordation fee
specified in Section 9.07(a)(vi) with respect to such assignment, and (z)
compliance with Section 9.07(c), the Substitute Lender shall succeed to the
rights and obligations of the Affected Lender hereunder and under the other Loan
Documents.  Upon the Substitute Lender so becoming a party hereto, the Borrowers
shall borrow Advances from the Substitute Lender and/or prepay the principal of
the Advances of the other Lenders in such manner as will result in the
outstanding principal amount of the Advances under each Facility being held by
the Lenders according to their respective Pro Rata Shares of the relevant
Facilities.

          (c)  The Borrowers may not exercise their rights under this Section
2.14:

            (i)  with respect to any Affected Lender unless the Borrowers
     simultaneously exercise such rights with respect to all Affected Lenders,

           (ii)  if a Default or an Event of Default has occurred and is then
     continuing, or

          (iii)  with respect to any exercise of rights under clause (b) above,
     if, at the time of such exercise, the aggregate amount of the Commitments
     that shall have been terminated pursuant to said clause (b) (including the
     Commitments then proposed to be terminated) shall exceed 30%
<PAGE>
 
                                     - 75 -

     of the aggregate amount of the Commitments in effect on the Restatement
     Date.

                                  ARTICLE III

                             CONDITIONS OF LENDING

          Section 3.01.  Conditions Precedent to Amendment and Restatement.  The
Existing Credit Agreement shall be amended and restated to read in full as set
forth herein on the date (the "Restatement Date") on which the Administrative
Agent shall notify the Company that the Administrative Agent shall have received
the following in form and substance satisfactory to it:

          (a)  The Notes, duly executed by each Borrower.

          (b)  The following documents, each dated the Restatement Date (unless
     otherwise specified), in form and substance satisfactory to the
     Administrative Agent (unless otherwise specified) and in sufficient copies
     for the Administrative Agent, each Lender and each Issuing Bank:

               (i)  for TI, a copy of the charter, as amended and in effect, of
          TI certified (as of a date reasonably close to the Restatement Date)
          by the Secretary of State of the State of Delaware and a certificate
          from such Secretary of State dated as of a date reasonably close to
          the Restatement Date as to the good standing of and charter documents
          filed by TI;

              (ii)  for TI, a certificate of the Secretary or an Assistant
          Secretary of TI, dated the Restatement Date and certifying (A) that
          attached thereto is a true and complete copy of the by-laws of TI as
          amended and in effect at all times from the date on which the
          resolutions referred to in clause (B) were adopted to and including
          the date of such certificate, (B) that attached thereto is a true and
          complete copy of resolutions duly adopted by the board of directors of
          TI authorizing the execution, delivery and performance of such of the
          Loan Documents to which TI is or is intended to be a party and the
          extensions of credit hereunder, and that such resolutions have not
          been modified, rescinded or amended and are in full force and effect,
          (C) that the charter of TI has not been amended since the date of the
          certification thereto furnished pursuant to clause (i) above, and (D)
          as to the incumbency and specimen signature of each officer of TI
          executing such of the Loan Documents to which TI
<PAGE>
 
                                     - 76 -

          is intended to be a party and each other document to be delivered by
          TI from time to time in connection therewith (and the Administrative
          Agent and each Lender may conclusively rely on such certificate until
          it receives notice in writing from TI);

             (iii)  for TI, a certificate of another officer of TI, dated the
          Restatement Date, as to the incumbency and specimen signature of the
          Secretary or Assistant Secretary, as the case may be, of TI;

              (iv)  a copy of each amendment to the charter or articles of
          incorporation or articles of limited partnership, as the case may be,
          of each Obligor (other than TI) that has become effective since the
          Second Restatement Date, certified (as of a date reasonably near the
          Restatement Date) by the Secretary of State of the state of its
          incorporation or organization, and a certificate from such Secretary
          of State dated as of a date reasonably close to the Restatement Date
          as to the good standing of and charter documents filed by such
          Obligor; and

               (v)  a certificate of each Obligor (other than TI), signed on its
          behalf by its President or a Vice President and its Secretary or any
          Assistant Secretary, dated the Restatement Date (the statements made
          in which certificate shall be true on and as of the Restatement Date),
          certifying as to (A) the absence, except to the extent provided in
          said certificate, of any amendments to the charter or articles of
          incorporation or organization of such Obligor since the Second
          Restatement Date, (B) the absence, except to the extent provided in
          said certificate, of any amendments to the bylaws of such Obligor
          subsequent to the Second Restatement Date, and (C) the due
          incorporation or organization and good standing of such Obligor as a
          corporation or limited partnership, as the case may be, organized
          under the laws of its state of incorporation or organization, and the
          absence of any proceeding for the dissolution or liquidation of such
          Obligor.

          (c)  The Holdings Pledge Agreement, the Terra Capital Pledge
     Agreement, the Subsidiary Pledge and Security Agreement and the TNLP Pledge
     and Security Agreement, in substantially the forms of Exhibits B-1, B-2, B-
     3 and B-4, respectively, duly executed by each of the intended parties
     thereto, together with:
<PAGE>
 
                                     - 77 -

               (i)  such appropriately completed and duly executed copies of
          Uniform Commercial Code financing statements and financing statement
          amendments as the Collateral Agent or any Secured Party thereunder
          shall have requested in order to continue the perfection and
          protection of the Liens created by the Security Documents and covering
          the Collateral described therein, and

              (ii)  executed and delivered documents for recordation and filing
          of or with respect to such Security Documents that the Collateral
          Agent or any Secured Party thereunder may deem necessary or desirable
          in order to continue the perfection and protection of the Liens
          created thereby.

          (d)  The Intercreditor Agreement, duly executed by each of the
     intended parties thereto.

          (e)  The Loan Purchase Agreement, duly executed and delivered by Terra
     and the Administrative Agent.

          (f)  A favorable opinion of Kirkland & Ellis, special counsel for the
     Obligors, in form and substance satisfactory to the Administrative Agent
     and the Lenders.

          (g)  A favorable opinion of Milbank, Tweed, Hadley & McCloy, special
     New York counsel for Citibank, in form and substance satisfactory to
     Citibank.

          (h)  A certificate of the Senior Financial Officer to the effect that:

               (x)  the representations and warranties contained in each Loan
          Document are correct on and as of the Restatement Date, before and
          after giving effect to the amendment and restatement provided for
          hereby, as though made on and as of such date (or, if any such
          representation or warranty is expressly stated to have been made as of
          a specific date, as of such specific date); and

               (y)  no event has occurred and is continuing that constitutes a
          Default or an Event of Default.

          (i)  Evidence of payment of (1) all accrued fees and expenses of the
     Administrative Agent (including the reasonable and documented fees and
     expenses of counsel to Citibank in connection with this Agreement to the
     extent that statements for such fees and expenses have been
<PAGE>
 
                                     - 78 -

     delivered to the Borrowers at least one Business Day prior to the
     Restatement Date); (2) all interest accrued through the Restatement Date on
     the "Advances" outstanding under and as defined in the Existing Credit
     Agreement, all accrued commitment fees, all accrued letter of credit fees
     and all other expenses payable thereunder; and (3) all "Advances" under and
     as defined in the Existing Credit Agreement owing to the Retiring Lenders
     and all other amounts owing to the Retiring Lenders under the Existing
     Credit Agreement.

          (j)  Evidence of the existence of all insurance required to be
     maintained by Terra hereunder.

          (k)  Evidence of receipt of all governmental and third party consents
     and approvals necessary in connection with this Agreement and the U.K.
     Nitrogen Acquisition (without the imposition of any conditions except those
     that are acceptable to the Lenders) and that the same remain in effect.

          (l)  Evidence that, since December 31, 1996, there has been no
     Material Adverse Change; and that no U.K. Nitrogen MAC has occurred.

          (m)  Evidence that (1) all conditions to the U.K. Nitrogen 
     Acquisition by Terra U.K. set forth in the Sale of Business Agreement have
     been (or shall simultaneously be) satisfied in all material respects
     without modification or waiver not consented to by the Lenders; and (2) the
     U.K. Nitrogen Acquisition has occurred or is contemporaneously occurring.

          (n)  Evidence that the Terra Canada Credit Facility shall be in full
     force and effect.

          (o)  Such other approvals, opinions and documents relating to this
     Agreement and the transactions contemplated hereby as any Lender or any
     Issuing Bank may, through the Administrative Agent, reasonably request.

          Section 3.02.  Conditions Precedent to Each Borrowing and Issuance.
The obligation of each Lender to make an Advance on the occasion of each
Borrowing (excluding, however, the making of any Advance pursuant to Section
2.13), and the right of each Borrower to request the issuance of Letters of
Credit under either Facility, shall be subject to the further conditions
precedent that on the date of such Borrowing or issuance the following
statements shall be true (and each of the giving of the applicable Notice of
Borrowing or Notice of Issuance and the acceptance by the relevant Borrower of
the proceeds of such
<PAGE>
 
                                     - 79 -

Borrowing or of such Letter of Credit shall constitute a representation and
warranty by such Borrower that on the date of such Borrowing or issuance such
statements are true):

          (i)  the representations and warranties contained in each Loan
     Document are correct on and as of the date of such Borrowing or issuance,
     before and after giving effect to such Borrowing or issuance and to the
     application of the proceeds therefrom, as though made on and as of such
     date (or, if any such representation or warranty is expressly stated to
     have been made as of a specific date, as of such specific date); and

         (ii)  no event has occurred and is continuing, or would result from
     such Borrowing or issuance or from the application of the proceeds
     therefrom, that constitutes a Default or an Event of Default.

          Section 3.03.  Determinations Under Section 3.01.  For purposes of
determining compliance with the conditions specified in Section 3.01, each
Lender shall be deemed to have consented to, approved or accepted or to be
satisfied with each document or other matter required thereunder to be consented
to or approved by or acceptable or satisfactory to the Lenders unless an officer
of the Administrative Agent responsible for the transactions contemplated by the
Loan Documents shall have received notice from such Lender prior to the
Restatement Date specifying its objection thereto.

                                   ARTICLE IV

                         REPRESENTATIONS AND WARRANTIES

          Section 4.01.  Representations and Warranties of the Company.  The
Company represents and warrants as follows:

          (a)  Each Obligor (i) is a corporation (or, in the case of TNLP or
     BMLP, a limited partnership) duly organized, validly existing and in good
     standing under the laws of the jurisdiction of its organization, (ii) is
     duly qualified and in good standing as a foreign corporation (or limited
     partnership, as the case may be) in each other jurisdiction in which it
     owns or leases property or in which the conduct of its business requires it
     to so qualify or be licensed and where, in each case, failure so to qualify
     and be in good standing could reasonably be expected to have a Material
     Adverse Effect and (iii) has all requisite power (corporate or other) and
     authority to own or lease and operate its
<PAGE>
 
                                     - 80 -

     properties and to carry on its business as now conducted and as proposed to
     be conducted.

          (b)  Set forth on Schedule 4.01(b) is a complete and accurate list of
     all Material Subsidiaries of each Obligor as of the Restatement Date (and
     after giving effect to the U.K. Nitrogen Acquisition), showing as of such
     date (as to each such Subsidiary) the jurisdiction of its organization, the
     number of shares of each class of capital stock or partnership interests
     authorized, and the number outstanding and the percentage of the
     outstanding shares or interests of each such class owned (directly or
     indirectly) by such Obligor and the number of shares covered by all
     outstanding options, warrants, rights of conversion or purchase and similar
     rights.  All of the outstanding capital stock or partnership interests of
     all of such Subsidiaries has been validly issued, is fully paid and non-
     assessable and is owned by such Obligor or one or more of its Subsidiaries
     free and clear of all Liens, except those created by the Security
     Documents.  Each Material Subsidiary (i) is a corporation (or, in the case
     of TNLP or BMLP, a limited partnership) duly organized, validly existing
     and in good standing under the laws of the jurisdiction of its
     organization, (ii) is duly qualified and in good standing as a foreign
     corporation or limited partnership, as the case may be, in each other
     jurisdiction in which it owns or leases property or in which the conduct of
     its business requires it to so qualify or be licensed and where, in each
     case, failure to so qualify and be in good standing could reasonably be
     expected to have a Material Adverse Effect and (iii) has all requisite
     power (corporate or other) and authority to own or lease and operate its
     properties and to carry on its business as now conducted and as proposed to
     be conducted.

          (c)  The execution, delivery and performance by each Obligor of this
     Agreement, the Notes and each other Loan Document to which it is or is
     intended to be a party, and the consummation of the credit transactions
     between Borrowers and Lenders contemplated hereby, are within such
     Obligor's powers (corporate or other), have been (or will, prior to the
     Restatement Date, be) duly authorized by all necessary corporate or other
     action, and do not (i) contravene such Obligor's charter, by-laws or, in
     the case of TNLP or BMLP, its agreement of limited partnership, (ii)
     violate any applicable law (including, without limitation, the Securities
     Exchange Act of 1934 and the Racketeer Influenced and Corrupt Organizations
     Chapter of the Organized Crime Control Act of 1970), rule, regulation
     (including, without limitation, Regulation U and
<PAGE>
 
                                     - 81 -

     Regulation X), order, writ, judgment, injunction, decree, determination or
     award (except for any such violation, by action or inaction of any Obligor,
     that could not reasonably be expected to have a Material Adverse Effect and
     that could not result in any liability of any Lender), (iii) except as set
     forth on Schedule 4.01(c), conflict with or result in the breach of, or
     constitute a default under, any contract, loan agreement, indenture,
     mortgage, deed of trust, lease or other instrument binding on or affecting
     any Obligor, any of its Subsidiaries or any of their properties (except for
     any such conflict, breach or default, caused by action or inaction of any
     Obligor, that could not reasonably be expected to have a Material Adverse
     Effect and that could not result in any liability of any Lender) or (iv)
     except for the Liens created by the Security Documents, result in or
     require the creation or imposition of any Lien upon or with respect to any
     of the properties of any Obligor or any of its Subsidiaries. No Obligor or
     any of its Subsidiaries is in violation of any such law, rule, regulation,
     order, writ, judgment, injunction, decree, determination or award or in
     breach of any such contract, loan agreement, indenture, mortgage, deed of
     trust, lease or other instrument, the violation or breach of which could be
     reasonably expected to have a Material Adverse Effect.

          (d)  No authorization or approval or other action by, and no notice to
     or filing with, any governmental authority or regulatory body or any other
     third party is required for (i) the due execution, delivery, recordation,
     filing or performance by any Obligor of this Agreement, the Notes or any
     other Loan Document to which it is or is to be a party, or for the
     consummation of the credit transactions between Borrowers and Lenders
     contemplated hereby, (ii) the grant by any Obligor of the Liens granted by
     it pursuant to the Security Documents, (iii) the perfection or maintenance
     of the Liens created by the Security Documents (except for the filings
     required to be made pursuant to Section 3.01(c)) or (iv) the exercise by
     the Collateral Agent, the Administrative Agent, any Lender or Issuing Bank
     or any other Secured Party (as defined in the Security Documents) of its
     rights under the Loan Documents or the remedies in respect of the
     Collateral pursuant to the Security Documents, except for the
     authorizations, approvals, actions, notices and filings listed on Schedule
     4.01(d), all of which have been duly obtained, taken, given or made and are
     in full force and effect.

          (e)  This Agreement has been, and each of the Notes and each other
     Loan Document when delivered will have been, duly executed and delivered by
     each Obligor that is intended to
<PAGE>
 
                                     - 82 -

     be a party thereto. This Agreement is, and each of the Notes and each other
     Loan Document when delivered will be, the legal, valid and binding
     obligation of each Obligor that is intended to be a party thereto,
     enforceable against such Obligor in accordance with its terms.

          (f)  The balance sheet of Terra as at December 31, 1996 and the
     related statements of income and cash flows of Terra for the twelve months
     then ended, accompanied by an opinion of Deloitte & Touche, independent
     public accountants, and the balance sheet of Terra as at September 30, 1997
     and the related statements of income and cash flows of Terra for the nine
     months then ended, duly certified by the chief financial officer of Terra,
     copies of which have been furnished to each Lender, present fairly, in all
     material respects, subject, in the case of said balance sheet as at
     September 30, 1997, and said statements of income and cash flows for the
     nine months then ended, to year-end audit adjustments, the financial
     condition of Terra as at such dates and the results of the operations of
     Terra for the periods ended on such dates, all in accordance with generally
     accepted accounting principles applied on a consistent basis. Since
     December 31, 1996, there has been no Material Adverse Change with respect
     to Terra. Prior to the consummation of the U.K. Nitrogen Acquisition, there
     has been no U.K. Nitrogen MAC.

          (g)  (A) No written information, exhibit or report (as at the
     Restatement Date) furnished by any officer of Terra to the Administrative
     Agent, any Issuing Bank or any Lender in connection with the negotiation of
     the Loan Documents (when taken together) contained any untrue statement of
     a material fact or omitted to state a material fact necessary to make the
     statements made therein not misleading and (B) none of the information,
     exhibits or reports furnished by any Obligor to the Administrative Agent,
     any Issuing Bank or any Lender pursuant to Section 5.03 contained (on the
     date of delivery thereof) any untrue statement of a material fact or
     omitted to state a material fact necessary to make the statements made
     therein not misleading; provided that the representations made in this
     Section 4.01(g) with respect to the U.K. Nitrogen Assets with respect to
     any time prior to the Restatement Date are made to the best of Terra's
     knowledge after due inquiry.

          (h)  There is no action, suit, litigation or proceeding against any
     Obligor or any of its Subsidiaries or any of their respective property,
     including any Environmental Action, pending before any court, governmental
     agency or arbitrator, or (to the knowledge of any Obligor) threatened,
<PAGE>
 
                                     - 83 -

     nor (to the knowledge of any Obligor) is there any investigation pending in
     respect of any Obligor, that:

               (1)  could reasonably be expected to have a Material Adverse
          Effect;

               (2)  on the Restatement Date could reasonably be expected to
          affect the legality, validity or enforceability of this Agreement, any
          Note, any other Loan Document or the consummation of the transactions
          contemplated hereby; or

               (3)  on the Restatement Date has resulted in a U.K. Nitrogen MAC.
          
          (i) No Obligor is engaged in the business of extending credit for the
     purpose of purchasing or carrying Margin Stock, and no proceeds of any
     Advance will be used for any purpose which violates the provisions of the
     regulations of the Board of Governors of the Federal Reserve System. After
     applying the proceeds of each Advance, not more than 25% of the value of
     the assets of either Borrower and such Borrower's Subsidiaries (as
     determined in good faith by such Borrower) that are subject to Section
     5.02(a) or Section 5.02(e) will consist of or be represented by Margin
     Stock. If requested by any Lender or the Administrative Agent, each
     Borrower will furnish to the Administrative Agent and each Lender a
     statement in conformity with the requirements of Federal Reserve Form U-1
     referred to in Regulation U, the statements made in which shall be such, in
     the opinion of each Lender, as to permit the transactions contemplated
     hereby in accordance with Regulation U.

          (j)  Set forth on Schedule 4.01(j) is a complete and accurate list, as
     of the Restatement Date, of each Plan that is subject to Title IV of ERISA
     and each Multiemployer Plan with respect to any employees or former
     employees of any Obligor or any of its ERISA Affiliates.

          (k)  No ERISA Event has occurred or is reasonably expected to occur
     with respect to any Plan of any Obligor or any of its ERISA Affiliates that
     could reasonably be expected to have a Material Adverse Effect.

          (l)  Since the date of the Schedule B (Actuarial Information) to the
     most recent annual report (Form 5500 Series) for each Plan of any Obligor
     or any of its ERISA Affiliates, there has been no change in the funding
     status of any such Plan except to the extent that such change is not
     reasonably expected to have a Material Adverse Effect.
<PAGE>
 
                                     - 84 -

          (m)  Neither any Obligor nor any of its ERISA Affiliates has incurred
     or is reasonably expected to incur any withdrawal liability to any
     Multiemployer Plan except to the extent such withdrawal liability is not
     reasonably expected to have a Material Adverse Effect.

          (n)  Neither any Obligor nor any of its ERISA Affiliates has been
     notified by the sponsor of a Multiemployer Plan of any Obligor or any of
     its ERISA Affiliates that such Multiemployer Plan is in reorganization or
     has been terminated, within the meaning of Title IV of ERISA.

          (o)  As of the Restatement Date, the aggregate annualized cost on a
     pay-as-you-go basis (including, without limitation, the cost of insurance
     premiums) with respect to post-retirement benefits under welfare plans
     (other than post-retirement benefits required to be provided by Section
     4980B of the Code or applicable state law) for which Terra and its
     Subsidiaries is liable does not exceed $1,000,000.

          (p)  Neither the business nor the properties of any Obligor or any of
     its Subsidiaries are affected by any fire, explosion, accident, strike,
     lockout or other labor dispute, drought, storm, hail, earthquake, embargo,
     act of God or of the public enemy or other casualty (whether or not covered
     by insurance) that could reasonably be expected to have a Material Adverse
     Effect.

          (q)  Except as set forth on Part I of Schedule 4.01(q) and except to
     the extent any of the following could not reasonably be expected to have a
     Material Adverse Effect, the operations and properties of each Obligor and
     each of its Subsidiaries comply in all material respects with all
     Environmental Laws, all necessary Environmental Permits have been obtained
     and are in effect for the operations and properties of each Obligor and its
     Subsidiaries, each Obligor and its Subsidiaries are in compliance in all
     material respects with all such Environmental Permits, and no circumstances
     exist that could (i) form the basis of an Environmental Action against any
     Obligor or any of its Subsidiaries or (ii) cause any such property to be
     subject to any material restrictions on ownership, occupancy, use or
     transferability under any Environmental Law.

          (r)  Except as set forth on Part II of Schedule 4.01(q) and except to
     the extent any of the following could not reasonably be expected to have a
     Material Adverse Effect, as of the Restatement Date none of the properties
     of any
<PAGE>
 
                                     - 85 -

     Obligor or any of its Subsidiaries is listed or proposed for listing on the
     National Priorities List under CERCLA or on the Comprehensive Environmental
     Response, Compensation and Liability Information System maintained by the
     Environmental Protection Agency or any analogous state list of sites
     requiring investigation or cleanup, and no underground storage tanks, as
     such term is defined in 42 U.S.C. 6901, are located on any property of any
     Obligor or any of its Subsidiaries.

          (s)  Except as set forth on Part III of Schedule 4.01(q) and except to
     the extent any of the following could not reasonably be expected to have a
     Material Adverse Effect, as of the Restatement Date neither any Obligor nor
     any of its Subsidiaries has been notified in writing by any federal, state
     or local governmental agency or any other Person that any Obligor or any of
     its Subsidiaries is potentially liable for the remedial or other costs with
     respect to treatment, storage, disposal, release, arrangement for disposal
     or transportation of any Hazardous Substance generated by any Obligor or
     any of its Subsidiaries, and Hazardous Materials have not been generated,
     used, treated, handled, stored or disposed of on, or released or
     transported to or from, any property of such Obligor (or, to its knowledge,
     any adjoining property) except in compliance in all material respects with
     all Environmental Laws and Environmental Permits, and all other wastes
     generated at any such properties by any Obligor or any of its Subsidiaries
     (and their respective agents, employees and contractors) have been disposed
     of in compliance with all Environmental Laws and Environmental Permits.

          (t)  Each Obligor and each of its Subsidiaries has filed, has caused
     to be filed or has been included in, all federal and state income tax
     returns and all other material tax returns (federal, state, local and
     foreign) required to be filed and has paid (or is contesting in good faith
     by appropriate proceedings) all taxes shown thereon to be owing, together
     with applicable interest and penalties.

          (u)  Set forth on Schedule 4.01(u) is a complete and accurate list, as
     of the date hereof, of each taxable year of Terra for which federal income
     tax returns have been filed and for which the expiration of the applicable
     statute of limitations for assessment or collection has not occurred by
     reason of extension or otherwise (an "Open Year").

          (v)  As of the Restatement Date, there are no adjustments to the
     federal income tax liability of Terra
<PAGE>
 
                                     - 86 -


     proposed by the Internal Revenue Service with respect to Open Years. No
     issues have been raised by the Internal Revenue Service in respect of Open
     Years that, in the aggregate, could reasonably be expected to have a
     Material Adverse Effect.

          (w)  Neither any Obligor nor any of its Subsidiaries is an "investment
     company," or an "affiliated person" of, or "promoter" or "principal
     underwriter" for, an "investment company," as such terms are defined in the
     Investment Company Act of 1940, as amended. Neither any Obligor nor any of
     its Subsidiaries is a "holding company", or an "affiliate" of a "holding
     company" or a "subsidiary company" of a "holding company", within the
     meaning of the Public Utility Holding Company Act of 1935, as amended.
     Neither the making of any Advances, nor the issuance of any Letters of
     Credit, nor the application of the proceeds or repayment thereof by the
     Borrowers, nor the consummation of the other transactions contemplated
     hereby, will violate any provision of such Act or any rule, regulation or
     order of the Securities and Exchange Commission thereunder.

          (x)  Each of Terra and the Company (both individually and collectively
     with their respective Subsidiaries) is Solvent.

          (y)  Set forth on Part I of Schedule 4.01(y) is a complete and
     accurate list, as of the Restatement Date, of all existing Debt of each
     Obligor, showing as of the Restatement Date (i) the principal amount
     outstanding thereunder, (ii) whether such Debt is secured by any Lien and
     (iii) the aggregate principal amount of such Debt scheduled to be paid
     during each fiscal year of Terra to and including the fiscal year of Terra
     in which the Terra Commitment Termination Date is scheduled to occur.

          Section 4.02.  Representations and Warranties of each Lender.  Each
Lender hereby represents and warrants that such Lender, in good faith, has not
relied upon Margin Stock as collateral for the Obligations of the Obligors
hereunder and under the other Loan Documents.


                                   ARTICLE V

                               COVENANTS OF TERRA

          Section 5.01.  Affirmative Covenants.  So long as any principal of or
interest on any Advance or any other amount payable under this Agreement shall
remain unpaid, any Letter of


<PAGE>
 
                                     - 87 -


Credit shall be outstanding or any Lender shall have any Commitment hereunder,
Terra will, and will cause each of the Obligors to:

          (a)  Compliance with Laws, Etc.  Comply, and cause each of its
     Subsidiaries to comply, with all applicable laws, rules, regulations and
     orders, such compliance to include, without limitation, compliance with
     ERISA and the Racketeer Influenced and Corrupt Organizations Chapter of the
     Organized Crime Control Act of 1970 (except to the extent that non-
     compliance with any thereof could not reasonably be expected to have a
     Material Adverse Effect).

          (b)  Payment of Taxes, Etc.  Pay and discharge, and cause each of its
     Subsidiaries to pay and discharge, before the same shall become delinquent,
     (i) all taxes, assessments and governmental charges or levies imposed upon
     it or upon its property and (ii) all lawful claims that, if unpaid, might
     by law become a Lien upon its property; provided that neither such Obligor
     nor any of its Subsidiaries shall be required to pay or discharge any such
     tax, assessment, charge or claim that is being contested in good faith and
     by proper proceedings and as to which appropriate reserves are being
     maintained to the extent required by GAAP, unless and until any Lien
     resulting therefrom attaches to its property and becomes enforceable
     against its other creditors.

          (c)  Compliance with Environmental Laws.  Comply, and cause each of
     its Subsidiaries and all lessees and other Persons occupying its properties
     to comply, with all Environmental Laws and Environmental Permits applicable
     to its operations and properties; obtain and renew, and cause each of its
     Subsidiaries to obtain and renew, all Environmental Permits necessary for
     its operations and properties; and conduct, and cause each of its
     Subsidiaries to conduct, any investigation, study, sampling and testing,
     and undertake any cleanup, removal, remedial or other action necessary to
     remove and clean up all Hazardous Materials from any of its properties, in
     accordance with the requirements of all Environmental Laws; provided that
     (i) neither such Obligor nor any of its Subsidiaries shall be required to
     undertake any such cleanup, removal, remedial or other action to the extent
     that its obligation to do so is being contested in good faith and by proper
     proceedings and appropriate reserves to the extent required by GAAP are
     being maintained with respect to such circumstances and (ii) no such
     compliance with laws and permits, obligation to obtain or renew permits or
     obligation to undertake any such investigation, study, sampling, testing,
     removal, remedial or other action shall be required hereunder to the extent
     no


<PAGE>
 
                                     - 88 -


     Material Adverse Effect could reasonably be expected to result from any
     failure to so comply, obtain, renew or undertake, either individually or in
     the aggregate.

          (d)  Maintenance of Insurance.  Maintain, and cause each of its
     Material Subsidiaries to maintain, with responsible and reputable insurance
     companies or associations, insurance, including business interruption
     insurance with respect to each manufacturing plant, in such amounts and
     covering such risks as is usually carried by companies engaged in similar
     businesses.

          (e)  Preservation of Corporate Existence, Etc.  Subject to Section
     5.02(d) and (e), preserve and maintain, and cause each of its Material
     Subsidiaries to preserve and maintain, its corporate or partnership
     existence, rights (charter and statutory) and franchises; provided that:

               (1)  from and after the BMLP Restructuring Time, BMLP may be
          dissolved on the terms and conditions set forth in the BMLP
          Partnership Agreement as in effect at the BMLP Restructuring Time; and

               (2)  neither any Obligor nor any of its Subsidiaries shall be
          required to preserve any right or franchise if the Board of Directors
          of such Obligor or such Subsidiary shall determine that the
          preservation thereof is no longer desirable in the conduct of the
          business of such Obligor or such Subsidiary, as the case may be, and
          that the loss thereof will not have a Material Adverse Effect.

          (f)  Visitation Rights.  At any reasonable time and as may be
     reasonably requested from time to time, permit the Administrative Agent,
     any Issuing Bank or any of the Lenders or any agents or representatives
     thereof to examine and make copies of and abstracts from the records and
     books of account of, and visit the properties of, such Obligor and any of
     its Subsidiaries (in the presence of an appropriate officer or
     representative of the relevant Obligor), and to discuss the affairs
     (including, but not limited to, the compliance by such Obligor and its
     Subsidiaries with all Environmental Laws), finances and accounts of such
     Obligor and any of its Subsidiaries with any of their officers or directors
     and with their independent certified public accountants.

          (g)  Preparation of Environmental Reports.  Upon either (i) the
     acquisition of any real property by such Obligor or any of its Subsidiaries
     the purchase price of which exceeds


<PAGE>
 
                                     - 89 -


     $1,000,000 or (ii) the occurrence and during the continuance of a Default
     or Event of Default arising under Section 5.01(c), and in each case at the
     written request of the Administrative Agent, such Obligor shall provide to
     the Administrative Agent within a reasonable time after such acquisition or
     request, as the case may be, at the expense of such Obligor, an
     environmental site assessment report for the acquired property (in the case
     of an acquisition as described in clause (i)) or for any properties of such
     Obligor which are the subject of any such Default or Event of Default (in
     the case of an event as described in clause (ii)) prepared by an
     environmental consulting firm reasonably acceptable to the Administrative
     Agent, indicating the presence or absence of Hazardous Materials and the
     estimated cost of any compliance, removal or remedial action in connection
     with any Hazardous Materials on such properties (provided that if such
     Obligor, in the exercise of its reasonable judgment, determines not to have
     such an environmental site assessment report prepared, such Obligor shall
     instead deliver to the Administrative Agent a copy of such Obligor's
     internal site assessment report relating to relevant property). Without
     limiting the generality of the foregoing, if the Administrative Agent
     determines at any time that a material risk exists that any such report
     will not be provided within a reasonable time following such request, the
     Administrative Agent may retain an environmental consulting firm to prepare
     such report at the expense of such Obligor, such Obligor and each of its
     Subsidiaries hereby granting to the Administrative Agent, such firm and any
     agents or representatives thereof an irrevocable non-exclusive license,
     subject to the rights of tenants, to enter onto its properties to undertake
     such an assessment.

          (h)  Keeping of Books.  Keep, and cause each of its Material
     Subsidiaries to keep, proper books of record and account, in which full and
     correct entries shall be made of all financial transactions and the assets
     and business of such Obligor and each such Subsidiary in accordance with
     GAAP.

          (i)  Maintenance of Properties, Etc.  Maintain and preserve, and cause
     each of its Material Subsidiaries to maintain and preserve, except to the
     extent the failure to do so could not reasonably be expected to have a
     Material Adverse Effect, all of its properties that are used or useful in
     the conduct of its business in good working order and condition, ordinary
     wear and tear excepted.


<PAGE>
 
                                     - 90 -


          (j)  Compliance with Terms of Leaseholds.  Make all payments and
     otherwise perform all obligations in respect of all leases of real
     property, keep such leases in full force and effect and not allow such
     leases to lapse or be terminated or any rights to renew such leases to be
     forfeited or canceled, except to the extent any such lease is no longer
     used or useful in the conduct of its business or which, in the exercise of
     the reasonable judgment of the relevant Obligor, is to be refinanced and
     except to the extent failure to comply with the foregoing would not have a
     Material Adverse Effect, and cause each of its Material Subsidiaries to do
     so.

          (k)  Performance of Sale of Business Agreement, Etc.  Perform and
     observe in all material respects all of the terms and provisions of the
     Sale of Business Agreement (and each document relating thereto) to be
     performed or observed by it, maintain the Sale of Business Agreement (and
     each such other document) in full force and effect and enforce in all
     material respects the Sale of Business Agreement (and each such other
     document) in accordance with its terms.

          (l)  Performance and Compliance with Material Contracts.  Perform and
     observe, and cause each of its Subsidiaries to perform and observe, all the
     terms and provisions of each Material Contract to be performed or observed
     by it, maintain each such Material Contract in full force and effect and
     enforce each such Material Contract in accordance with its terms, except to
     the extent the failure to do any of the foregoing could not reasonably be
     expected to have a Material Adverse Effect.

          (m)  Transactions with Affiliates.  Conduct, and cause each of its
     Subsidiaries to conduct, all transactions otherwise permitted under the
     Loan Documents with any of its Affiliates on terms that are fair and
     reasonable and no less favorable to such Obligor or such Subsidiary than
     would obtain in a comparable arm's-length transaction with a Person that is
     not an Affiliate; provided that this Section 5.01(m) shall not be
     applicable to:

               (i)  transactions between such Obligor and wholly owned
          Subsidiaries of Terra or between wholly owned Subsidiaries of Terra
          unless otherwise prohibited by this Agreement;

              (ii)  compensation paid for services rendered by any director or
          officer of such Obligor or any director or officer of a Subsidiary of
          such Obligor serving at the direction or request of such Obligor to
          the extent


<PAGE>
 
                                     - 91 -


          such compensation is determined in the good faith exercise of business
          judgment by the Board of Directors of such Obligor to be reasonable
          and appropriate to the functions of such office;

               (iii)  transactions under Intercompany Receivables Facilities;

               (iv)   Investments in Permitted JVs to the extent permitted
          hereunder and general and administrative and purchasing services for
          Permitted JVs (including inventory purchasing arrangements, whether
          for inventory manufactured and/or produced by Terra or any of its
          Subsidiaries or purchased from third parties, vendors or suppliers and
          including leasing and subleasing of furnishings, fixtures and
          equipment);

               (v)    transactions among members of the BMLP Group;

               (vi)   transactions under the Management Agreements; and

               (vii)  transactions under the Terra U.K. Offtake Agreement.

          (n)  Further Assurances.  (i) Promptly upon reasonable request by the
     Administrative Agent or any Lender or Issuing Bank through the
     Administrative Agent, correct, and cause each Subsidiary promptly to
     correct, any material defect or error that may be discovered in any Loan
     Document, which material defect or error is the result of any untrue
     statement of material fact under any Loan Document or the omission to state
     a material fact necessary to make the statements made therein not
     misleading, or in the execution, acknowledgment or recordation of any Loan
     Document, and (ii) promptly upon reasonable request by the Collateral
     Agent, the Administrative Agent or any Lender or Issuing Bank through the
     Administrative Agent do, execute, acknowledge, deliver, record, re-record,
     file, re-file, register and re-register, and cause any such Subsidiary
     promptly to do, execute, acknowledge, deliver, record, re-record, file, re-
     file, register and re-register, any and all such further acts, deeds,
     conveyances, pledge agreements, assignments, financing statements and
     continuations thereof, termination statements, notices of assignment,
     transfers, certificates, assurances and other instruments as the Collateral
     Agent, the Administrative Agent or any Lender or Issuing Bank through the
     Administrative Agent may reasonably require from time to time in order to
     (A) subject to the Liens created by any of


<PAGE>
 
                                     - 92 -

     the Security Documents any of such Obligor's and its Subsidiaries'
     properties, rights or interests covered or now or hereafter intended to be
     covered by any of the Security Documents, (B) perfect and maintain the
     validity, effectiveness and priority of any of the Security Documents and
     the Liens intended to be created thereby and (C) assure, convey, grant,
     assign, transfer, preserve, protect and confirm more effectively unto the
     Collateral Agent the rights granted or now or hereafter intended to be
     granted to it under any Security Document or under any other instrument
     executed in connection with any Security Document to which such Obligor,
     any other Obligor or any of their respective Subsidiaries is or may become
     a party.

          (o)  Ownership of the Obligors.  Take, and will cause each of its
     Subsidiaries to take, such action from time to time as shall be necessary
     to ensure that:

               (i)     Terra will at all times own, beneficially and of record,
          all of the issued and outstanding capital stock (other than directors'
          qualifying shares) of Terra Capital Holdings;

               (ii)    Terra Capital Holdings will at all times own,
          beneficially and of record, all of the issued and outstanding capital
          stock (other than directors' qualifying shares) of the Company, and
          will own no other property (other than (x) cash, (y) other property
          incidental to its business as a holding company and (z) capital stock
          of, or other ownership interests in, Receivables Subsidiaries);

               (iii)   the Company will at all times own:

                    (1)  beneficially and of record, all of the issued and
               outstanding capital stock (other than directors' qualifying
               shares) of TI, BMCH, TMC and TNC and

                    (2)  no other property, other than:

                         (A)  cash and Permitted Investments,

                         (B)  Receivables of one or more of its Subsidiaries
                    transferred to it, and capital stock of, or other ownership
                    interests in, Receivables Subsidiaries,

                         (C)  Senior Preference Units purchased pursuant to the
                    SPU Redemption, and capital
<PAGE>
 
                                     - 93 -

                    stock of a wholly owned Subsidiary of the Company organized
                    for the purpose of holding such Senior Preference Units,

                         (D)  other property incidental to its business as a
                    holding company,

                         (E)  other property used solely in connection with its
                    performance of services pursuant to the terms of the
                    Management Agreements and

                         (F)  other Investments permitted to be held by the
                    Company pursuant to Section 5.02(f) (to the extent such
                    Investments, in the case of those made under clauses (iv),
                    (v) and (vi) of said Section 5.02(f), are subject to the
                    Lien of the Security Documents);

               (iv)    except to the extent necessary to give effect to the BMLP
          Restructuring, BMCH will at all times own, beneficially and of record,
          a 99% limited partnership interest in BMLP; and at all times BMCH will
          own no other property (other than cash and other property incidental
          to its business as a holding company);

               (v)     except to the extent necessary to give effect to the BMLP
          Restructuring, TMC will at all times own, beneficially and of record,
          a 1% general partnership interest in BMLP; and at all times TMC will
          own no other property (other than cash and other property incidental
          to its business as a holding company);

               (vi)    without limiting clauses (iv) and (v) above, TMC and BMCH
          will at all times own, beneficially and of record, all of the
          partnership interests in BMLP other than the BMLP Class A Limited
          Partnership Interest;

               (vii)   Terra Canada will at all times own, beneficially and of
          record, all of the capital stock of Terra U.K.;

               (viii)  TNC will own no property other than cash and:
<PAGE>
 
                                     - 94 -

                    (v)  ownership interests of TNCLP and its successors and a
               general partnership interest in TNLP and its successors;

                    (w)  capital stock of a wholly owned Subsidiary of TNC
               organized for the purpose of holding Senior Preference Units;

                    (x)  equipment and other property principally used in
               connection with TNC's performance of general and administrative
               services (including, without limitation, property related to
               incentive compensation plans, deferred compensation plans and
               other funded benefit plans) for Terra and its Subsidiaries;

                    (y)  raw materials and other property used in the
               manufacture, storage, sale and distribution of nitrogen and
               methanol products by Terra and its Subsidiaries in the ordinary
               course of business, provided that the aggregate book value of all
               tangible property of TNC referred to in this paragraph (y) shall
               not at any time exceed $10,000,000; and

                    (z)  other property incidental to its business as a holding
               company and a general partner; and

               (ix)    TNCLP will at all times own no property other than
          ownership interests of TNLP and its successors (other than cash,
          Senior Preference Units purchased pursuant to the SPU Redemption and
          other property incidental to its business as a holding company).

     In the event that any such additional shares of stock or other ownership
     interests shall be issued to an Obligor by any Subsidiary thereof, the
     respective Obligor agrees forthwith to deliver to the Collateral Agent
     pursuant to the Security Documents the certificates (if any) evidencing
     such ownership interests accompanied by undated powers executed in blank
     and to take such other action as the Collateral Agent or the Administrative
     Agent shall request to perfect the security interest created therein
     pursuant to the Security Documents. Without limiting the foregoing, neither
     TNCLP nor TNLP shall convert to a corporate form except pursuant to the SPU
     Redemption.
<PAGE>
 
                                     - 95 -

          (p)  Delivery of Management Agreements.  On or prior to the date of
     execution of each Management Agreement, notify the Administrative Agent
     thereof (and the Administrative Agent shall notify the Lenders thereof
     promptly) and shall deliver to the Administrative Agent a certified copy
     thereof (each such Management Agreement to be in form and substance
     reasonably satisfactory to the Administrative Agent). Promptly following
     each amendment, waiver and consent relating to a Management Agreement (but
     subject to Section 5.02(p)), Terra shall give the Administrative Agent
     notice thereof (and the Administrative Agent shall notify the Lenders
     thereof promptly), and shall deliver to the Administrative Agent a
     certified or conformed copy of each such amendment, waiver and consent.

          Section 5.02.  Negative Covenants.  So long as any principal of or
interest on any Advance or any other amount payable under this Agreement shall
remain unpaid, any Letter of Credit shall be outstanding or any Lender shall
have any Commitment hereunder, Terra will not, and will not permit any of its
Material Subsidiaries to:

          (a)  Liens, Etc.  Create, incur, assume or suffer to exist, or permit
     any of its Material Subsidiaries to create, incur, assume or suffer to
     exist, any Lien on or with respect to any of its properties of any
     character (including, without limitation, accounts) whether now owned or
     hereafter acquired, or sign or file, or permit any of its Subsidiaries to
     sign or file, under the Uniform Commercial Code of any jurisdiction, a
     financing statement that names such Obligor or any of its Subsidiaries as
     debtor, or sign, or permit any of its Subsidiaries to sign, any security
     agreement authorizing any secured party thereunder to file such financing
     statement, or assign, or permit any of its Subsidiaries to assign, any
     accounts or other right to receive income, excluding from the operation of
     the foregoing restrictions the following:

               (i)     Liens created by the Loan Documents;

               (ii)    Permitted Liens; Liens in favor of banks which arise
          under Article 4 of the Uniform Commercial Code on items in collection
          and documents relating thereto and proceeds thereof; and Liens in
          favor of customs and revenue authorities arising as a matter of law to
          secure customs duties in connection with the importation of goods;

               (iii)   Liens existing on the Restatement Date and described on
          Schedule 5.02(a)(iii);
<PAGE>
 
                                     - 96 -

               (iv)    Liens on cash (in an aggregate amount, for Terra and its
          Subsidiaries taken as a whole, not exceeding $15,000,000 at any time)
          to secure the Obligations in respect of letters of credit permitted
          under Section 5.02(b)(1)(iv);

               (v)     Liens on Receivables and incidental property of the
          Company or any of its Subsidiaries to secure such Person's Obligations
          under the Intercompany Receivables Facilities and/or under the
          Permitted Receivables Facilities;

              (vi)     Purchase money Liens upon or in property acquired or held
          by Terra or such Subsidiary in the ordinary course of business to
          secure the purchase price of such property or to secure Debt
          (including, without limitation, commercial letters of credit) incurred
          solely for the purpose of financing the acquisition, construction or
          improvement of any such property to be subject to such Liens, or Liens
          existing on any such property at the time of acquisition (and not
          created in anticipation thereof), or extensions, renewals or
          replacements of any of the foregoing for the same or a lesser amount;
          provided that (x) no such Lien shall extend to or cover any property
          other than the property being acquired, constructed or improved, and
          no such extension, renewal or replacement shall extend to or cover any
          property not theretofore subject to the Lien being extended, renewed
          or replaced; and (y) the Debt secured by any such Lien shall at no
          time exceed 100% of the fair market value (as determined in good faith
          by the Senior Financial Officer) of such property at the time it was
          acquired;

               (vii)   Any Lien arising after the Restatement Date in favor of
          any state of the United States of America or any agency, political
          subdivision or instrumentality thereof, upon any pollution abatement
          or control facilities being financed in compliance with Section
          103(c)(4)(F) of the Internal Revenue Code of 1986, as in effect on the
          date of this Agreement (or any successor statute which is similar in
          all substantive respects), the interest payable in respect of which
          financing is excluded from gross income under said Section 103,
          provided that (x) the Debt secured by such Lien is not prohibited by
          clause (b)(1) of this Section 5.02, and (y) such Lien does not cover
          any other property at any time owned by Terra or any Material
          Subsidiary;
<PAGE>
 
                                     - 97 -

            (viii)  Liens on property that is the subject of a capital lease to
          secure the performance of the Capital Lease Obligations relating
          thereto;

              (ix)  Liens upon property of a Person that becomes a Subsidiary of
          Terra after the Restatement Date, each of which Liens existed on such
          property before the time such Person became a Subsidiary of Terra and
          was not created in anticipation thereof; provided that no such Lien
          shall extend to or cover any property of Terra or any of its
          Subsidiaries other than the property subject to such Liens at the time
          such Person became a Subsidiary of Terra and improvements thereon;

               (x)  Leases or subleases, and licenses or sublicenses, granted to
          third Persons not interfering in any material respect with the
          business of Terra or such Subsidiary;

              (xi)  Easements, rights-of-way, restrictions, minor defects or
          irregularities in title and other similar charges or encumbrances not
          interfering in any material respect with the ordinary conduct of the
          business of Terra or such Subsidiary;

             (xii)  Liens arising from Uniform Commercial Code financing
          statements regarding operating leases permitted by this Agreement;

            (xiii)  Any interest or title of a lessor or sublessor or licensor
          under any lease or license permitted or not prohibited by this
          Agreement;

             (xiv)  Additional Liens upon property created after the Restatement
          Date, provided that the aggregate Debt secured thereby and incurred on
          and after the Restatement Date shall not exceed $10,000,000 in the
          aggregate at any one time outstanding;

              (xv)  Liens on property constituting all or part of the Ammonia
          Loop incurred in connection with the construction thereof;

             (xvi)  The replacement, extension or renewal of any Lien permitted
          by clauses (iii), (iv), (v), (ix), (xiv) and (xv) above upon or in the
          same property theretofore subject thereto or the replacement,
          extension or renewal (without increase in the principal amount or
          change in any direct or contingent obligor) of the Debt secured
          thereby;
<PAGE>
 
                                     - 98 -

            (xvii)  Liens on property of Terra Canada to secure the Terra Canada
          Credit Facility;

           (xviii)  Liens on property of Terra U.K. to secure the Terra U.K.
          Loan;

             (xix)  Liens securing obligations of the Company and its
          Subsidiaries under Hedge Agreements permitted by Section 5.02(c); and

              (xx)  Liens on property of Terra and its Subsidiaries (other than
          (1) property subject to the Liens under the Security Documents and (2)
          property subject to any Liens securing Debt of Terra or such
          Subsidiaries) in favor of Terra or any of its Subsidiaries to secure
          Debt owing to Terra or any of its Subsidiaries.

          (b)  Debt.

          (1)  Generally.  Create, incur, assume or suffer to exist, or permit
     any of its Subsidiaries to create, incur, assume or suffer to exist, any
     Debt other than:

               (i)  Debt under the Loan Documents;

              (ii)  Debt in respect of Hedge Agreements permitted by Section
          5.02(c);

             (iii)  Debt in respect of unsecured trade payables (and Obligations
          in respect of letters of credit supporting such trade payables);

              (iv)  Debt (including, without limitation, Obligations in respect
          of letters of credit) not secured by any Lien (other than Liens
          permitted by Section 5.02(a)(iv)), so long as, on the date of the
          incurrence thereof, the aggregate principal amount (or the U.S. Dollar
          equivalent of the aggregate principal amount) of all Debt of Terra and
          its Subsidiaries on a Consolidated basis (as reasonably determined by
          the Senior Financial Officer on and as of the date of such incurrence)
          then outstanding under this clause (iv) (including, without
          limitation, the Debt proposed to be incurred on such date) does not
          exceed $50,000,000;

               (v)  Obligations of the Company and its Subsidiaries under the
          Intercompany Receivables Facilities and under the Permitted
          Receivables Facilities;
<PAGE>
 
                                     - 99 -

              (vi)  Debt securities of Terra issued in a public offering
          pursuant to an effective registration statement the terms of which
          (including, without limitation, as to interest rates, amortization
          (provided that in any event no payments of principal, redemptions,
          sinking fund payments or the like shall be scheduled to be made before
          the Terra Commitment Termination Date), redemption, average life to
          maturity, covenants, events of default and other terms) are reasonably
          satisfactory to the Required Lenders;

             (vii)  Debt outstanding (or committed to be made available) as at
          September 30, 1997 and set forth on Schedule 4.01(y);

            (viii)  endorsement of negotiable instruments for deposit or
          collection or similar transactions in the ordinary course of business;

              (ix)  Intercompany Debt permitted under Section 5.02(b)(2);

               (x)  Debt secured by Liens permitted under Section 5.02(a)(vi);
          purchase money Debt secured by Liens permitted under 5.02(a)(ix); and
          Debt in an aggregate principal amount not exceeding $10,000,000 at any
          one time outstanding secured by Liens permitted under Section
          5.02(a)(xiv);

              (xi)  Acquired Debt in an aggregate principal amount not exceeding
          $50,000,000 at any one time outstanding;

             (xii)  1995 Terra Debt (and Debt of Terra evidenced by instruments
          issued in exchange for such Debt), and renewals, refinancings and
          replacements thereof  (without increase in the principal amount or
          change in any direct or contingent obligor, and on such other terms
          and conditions as shall be no less favorable to Terra and its
          Subsidiaries than the Debt being so renewed, refinanced or replaced);

            (xiii)  renewals, refinancings and replacements of the Debt
          permitted under clauses (vi), (vii), (x) and (xi) above and clause
          (xviii) below (without increase in the principal amount or change in
          any direct or contingent obligor and not including any Debt to be paid
          or prepaid with the proceeds of Advances);
<PAGE>
 
                                    - 100 -

             (xiv)  if at any time Britz LLC is a Subsidiary of Terra, Capital
          Lease Obligations owing by Britz LLC to BFI with respect to fixtures,
          furniture, equipment and other Property in an aggregate principal
          amount presently contemplated to be approximately $25,400,000 but in
          no event exceeding $30,000,000, and (regardless of whether Britz LLC
          is a Subsidiary of Terra) the Guarantee of such Obligations by Terra
          or one or more of its Subsidiaries;

              (xv)  Debt of Terra (or one or more of its Subsidiaries) in a
          principal amount (contemplated to be approximately $20,000,000,
          subject to adjustment in increases or decreases in BFI's capital
          account in Britz LLC) as required under the put/call provisions of the
          Britz JV Agreement, but in any event not exceeding $30,000,000, owing
          under one or more promissory notes payable by Terra or one or more of
          its Subsidiaries to BFI and/or one or more of BFI's Affiliates as
          consideration for the transfer by BFI to TI or one or more of its
          Subsidiaries of the membership interests in Britz LLC not theretofore
          held by TI and its Subsidiaries, and the Guarantee of such Debt by
          Terra or one or more of its Subsidiaries;

             (xvi)  Obligations of TI in a maximum amount not exceeding
          $5,000,000 owing to BFI and/or one or more of BFI's Affiliates under
          one or more consulting or service agreements, and the Guarantee of
          such Obligations by Terra or one or more of its Subsidiaries;

            (xvii)  Debt of Terra to former shareholders of Huntting Elevator
          Company in an aggregate principal amount not exceeding $7,000,000;

            (xviii)  Debt of Terra Canada under the Terra Canada Credit Facility
          in an aggregate principal amount not at any time exceeding
          $125,000,000, and Guarantees thereof by Terra and one or more of its
          Subsidiaries;

             (xix)  [intentionally omitted];

              (xx)  unsecured Debt of Terra U.K. in an aggregate principal
          amount not at any time exceeding (Pounds)7,000,000; and

             (xxi)  unsecured Debt of Terra Canada in an aggregate principal
          amount not at any time exceeding
<PAGE>
 
                                    - 101 -

          $10,000,000 (or its equivalent in Canadian Dollars at the time of
          borrowing thereof).

          (2)  Intercompany Debt.  Create, incur, assume or suffer to exist, or
     permit any of its Subsidiaries to create, incur, assume or suffer to exist,
     any Intercompany Debt other than:

               (i)  Intercompany Debt outstanding on December 31, 1997;

              (ii)  Debt of the Company to BMLP, and Debt of one or more of the
          Company's Subsidiaries to BMLP that is Guaranteed by the Company
          (collectively, "BMLP Demand Loans"), provided that, if the aggregate
          principal amount of BMLP Demand Loans outstanding as at the end of any
          month ending on or after the BMLP Restructuring Time exceeds
          $145,000,000, the Company shall repay (or cause to be repaid) BMLP
          Demand Loans in an aggregate amount equal to such excess as soon as
          reasonably possible and in any event within 30 days after the end of
          such month;

             (iii)  from and after the BMLP Restructuring Time, Debt of the
          Company to BMLP in an aggregate principal amount not at any time
          exceeding $5,000,000 evidenced by a single promissory note payable to
          BMLP (such note, as from time to time amended, the "Terra Capital
          Note"), provided that such Debt reevidences an equivalent principal
          amount of accounts receivables owing by the Company to BMLP at the
          BMLP Restructuring Time;

              (iv)  Debt of Terra U.K. to Terra U.K. Holdings in an aggregate
          principal amount not at any time exceeding $175,000,000 (the "Terra
          U.K. Loan"), provided that the proceeds of such Debt are used solely
          to finance part of the purchase price of the U.K. Nitrogen
          Acquisition;

               (v)  Obligations under the U.K. Offtake Agreement;

              (vi)  additional Intercompany Debt (other than Debt of members of
          the Terra Canada Group and, from and after the BMLP Restructuring
          Time, Debt of members of the BMLP Group);

             (vii)  Intercompany Debt owing by members of the BMLP Group to
          other members of the BMLP Group;
<PAGE>
 
                                    - 102 -

            (viii)  Intercompany Debt owing by members of the Terra Canada Group
          to other members of the Terra Canada Group;

              (ix)  additional Intercompany Debt of Terra Canada and Terra U.K.
          in an aggregate principal amount not at any time exceeding (1) during
          the period ending on December 31, 1998, $60,000,000, and (2)
          thereafter, $50,000,000; and

               (x)  additional Intercompany Debt.

          (c)  Hedge Agreements.  Enter into or permit to be outstanding, or
     permit any of its Subsidiaries to enter into or permit to be outstanding,
     any Hedge Agreement other than:

               (1)  Hedge Agreements entered into prior to the Restatement Date
          and identified on Schedule 5.02(c);

               (2)  the Methanol Hedging Agreement;

               (3)  the Terra U.K. Offtake Agreement;

               (4)  the Ammonium Nitrate Hedging Agreement; and

               (5)  other Hedge Agreements entered into in the ordinary course
          of business and in a reasonably prudent manner and not for speculative
          purposes, in each case in order to protect against the fluctuation in
          interest rates, foreign exchange rates or commodity prices.

          (d)  Mergers, Etc.  Merge with or into or consolidate with or into any
     Person, or permit any of its Material Subsidiaries to do so, except that:

               (i)  if no Default or Event of Default shall have occurred and be
          continuing or would result therefrom, (x) any Subsidiary of the
          Company may be merged or consolidated with or into the Company
          (provided that the Company shall be the continuing or surviving
          corporation) or any other wholly owned Subsidiary of the Company and
          (y) the Company or any of its Subsidiaries may merge or consolidate
          with any other Person; provided that (1) in the case of a merger or
          consolidation of the Company, the Company is the continuing or
          surviving corporation, and (2) in any other case, the continuing or
          surviving corporation is a wholly owned Subsidiary of the Company;
<PAGE>
 
                                    - 103 -

              (ii)  if no Default or Event of Default shall have occurred and be
          continuing or would result therefrom, (x) any Outside Subsidiary may
          be merged or consolidated with or into Terra (provided that Terra
          shall be the continuing or surviving corporation) or any other wholly
          owned Outside Subsidiary of Terra and (y) Terra or any of its Outside
          Subsidiaries may merge or consolidate with any other Person (other
          than Terra Capital Holdings or any of its Subsidiaries); provided that
          (1) in the case of a merger or consolidation of Terra, Terra is the
          continuing or surviving corporation, and (2) in any other case, the
          continuing or surviving corporation is a wholly owned Outside
          Subsidiary of Terra; and

             (iii)  nothing in this Section 5.02(d) shall be deemed to prohibit
          the U.K. Nitrogen Acquisition.

          (e)  Sales, Etc., of Assets.  Sell, lease, transfer or otherwise
     dispose of (including, without limitation, in a sale-leaseback
     transaction), or permit any of its Subsidiaries to sell, lease, transfer or
     otherwise dispose of (including, without limitation, in a sale-leaseback
     transaction), any of its assets, including (without limitation) any
     manufacturing plant or substantially all assets constituting the business
     of a division, branch or other unit operation, except:

               (i)  sales of inventory in the ordinary course of its business;

              (ii)  sales or other dispositions of obsolete or worn-out
          equipment no longer used or useful in its business;

             (iii)  dispositions of assets by one member of the Specified Group
          to another member of the Specified Group (where "Specified Group"
          means, collectively, the Company and each of its wholly owned
          Subsidiaries);

              (iv)  (X) to the extent not permitted pursuant to clause (iii)
          above, dispositions of assets by one Obligor to another and by an
          Obligor to one of its or any other Obligor's wholly owned
          Subsidiaries,  (Y) other Dispositions to the extent the Net Available
          Proceeds thereof are invested or committed to be invested in the
          business of the Company and its Subsidiaries within one year from the
          date of the relevant Disposition, and (Z) other Dispositions in an
          aggregate amount not to exceed $50,000,000 in any
<PAGE>
 
                                    - 104 -

          period of 12 consecutive months; provided that, in the case of all
          Dispositions under this clause (iv) (A) each such asset is sold for an
          amount not less than its fair market value, (B) no such asset may be
          sold to the extent that it is, individually or when considered with
          any other asset or assets sold or expected to be sold in such period
          (but taking into account property acquired in exchange for, or to be
          acquired substantially contemporaneously with the disposition of, the
          assets so sold or expected to be sold), material to the business,
          assets, operations, properties or financial condition of Terra and its
          Subsidiaries taken as a whole, and (C) the Net Available Proceeds of
          such Disposition are applied in accordance with and to the extent
          required by Section 2.05(b), and to the extent the assets subject to
          the Disposition constituted part of the Collateral, all other cash and
          non-cash proceeds of such Disposition become subject to the Lien
          created by the Security Documents in accordance with the terms
          thereof;

               (v)  nothing in this Section 5.02(e) shall prohibit the Company
          or any of its Subsidiaries from selling Receivables (x) under any
          Permitted Receivables Facility (subject to the restrictions specified
          in the definition of said term) or (y) under any Intercompany
          Receivables Facility;

              (vi)  sales, transfers and other dispositions of assets to Britz
          LLC so long as such transactions are (if at the time Britz LLC is not
          a wholly owned Subsidiary of the Company) in the ordinary course of
          business and on ordinary business terms;

             (vii)  transfers of assets by Terra or one of the Outside
          Subsidiaries, directly or indirectly, to a wholly owned Subsidiary of
          Terra (a "Recipient") so long as the consideration paid by such
          Recipient (if any) for all such assets does not exceed the fair market
          value of such property;

            (viii)  transfers by TI of the Blytheville Assets to Farmland JV in
          accordance with Section 5.02(f)(xviii)(x);

              (ix)  from and after the BMLP Restructuring Time, transfers of
          assets by BMLP or any of its wholly owned Subsidiaries to BMLP or any
          of its wholly owned Subsidiaries;
<PAGE>
 
                                    - 105 -

               (x)  from and after the BMLP Restructuring Time, (A) transfers of
          assets by Terra or one of its wholly owned Subsidiaries to BMLP or a
          Subsidiary thereof so long as the consideration paid to Terra and its
          wholly owned Subsidiaries for all such assets is not less than the
          fair market value of such property; and (B) transfers of assets by
          BMLP or a Subsidiary thereof to Terra or one of its wholly owned
          Subsidiaries so long as the consideration paid by Terra and its wholly
          owned Subsidiaries for all such assets does not exceed the fair market
          value of such property;

              (xi)  nothing in this Section 5.02(e) shall prohibit the BMLP
          Restructuring; and

             (xii)  additional sales, leases, transfers and other dispositions
          of property by Terra and its Subsidiaries (other than (1) property
          subject to the Liens under the Security Documents and (2) property
          subject to any Liens securing Debt of Terra or such Subsidiary) to
          Terra or any of its Subsidiaries.

          (f)  Investments.  Make or hold, or permit any of its Subsidiaries to
     make or hold, any Investment, other than:

               (i)  Investments by Terra and its Subsidiaries in cash and
          Permitted Investments;

              (ii)  Investments constituting (A) operating deposit accounts with
          banks and (B) Receivables arising in the ordinary course of business
          on ordinary business terms, in each case in accordance with, and
          subject to the terms of, the Security Documents;

             (iii)  Investments described in Schedule 5.02(f);

              (iv)  Investments arising solely by reason of any merger or
          consolidation expressly permitted by Section 5.02(d)(i)(x) or
          5.02(d)(ii)(x);

               (v)  Subject to the terms set forth on Exhibit G, Specified
          Acquisitions to the extent permitted to be made under Section 5.02(h);

              (vi)  Investments consisting of acquisitions of property
          (including, without limitation, ownership interests in any Person) by
          Terra or any of its Subsidiaries so long as (x) the aggregate fair
          market value of all such property acquired in any fiscal year of Terra
          shall not exceed $50,000,000, and (y) the
<PAGE>
 
                                    - 106 -

          consideration paid by Terra and its Subsidiaries for each such
          acquisition consists solely of equity securities issued by Terra;

             (vii)  Investments in respect of Hedge Agreements permitted by
          Section 5.02(c);

            (viii)  Investments in Lynn Seeds, Inc. in an aggregate amount not
          exceeding $4,000,000;

              (ix)  Investments in Agro-Terra Internacional, S.A. de C.V., a
          joint venture between TI and Grupo Acerero del Norte, S.A. de C.V., in
          an aggregate amount not exceeding $5,000,000;

               (x)  Investments made pursuant to Terra's Supplemental Deferred
          Compensation Plan and its Excess Benefit Plan, each as in effect from
          time to time;

              (xi)  Investments by Terra consisting of Terra Stock Repurchases;

             (xii)  Investments by Terra and its Subsidiaries consisting of the
          purchase, redemption or other acquisition of Senior Preference Units
          pursuant to the SPU Redemption;

            (xiii)  Debt (including Guarantees of Debt) constituting
          Investments, to the extent such Debt is permitted under Section
          5.02(b);

             (xiv)  Investments by the Company and its Subsidiaries in members
          of the Terra Canada Group, and Investments by the Company and its
          Subsidiaries in members of the BMLP Group, in each case outstanding on
          the Restatement Date;
              (xv)  capital contributions to Receivables Subsidiaries;

             (xvi)  (x) working capital advances or loans made by Terra or one
          or more of its Subsidiaries to Britz LLC from time to time to the
          extent required or permitted pursuant to the terms of the Britz
          Documents; and (y) loans, advances and capital contributions made by
          Terra or one or more of its Subsidiaries to Britz LLC from time to
          time to finance the purchase by Britz LLC of furnishings, fixtures and
          equipment, real estate and/or equity interests in entities engaged in
          the same or allied lines of business in an aggregate principal
<PAGE>
 
                                    - 107 -

          amount not to exceed $10,000,000 at any one time outstanding;

            (xvii)  the purchase and sale by Terra of one or more Specified Call
          Options (each relating to the same U.S. Stock Index and entered into
          with the same counterparty) having an aggregate net cost to Terra and
          its Subsidiaries of not more than $20,000,000, which purchases and
          sales when taken together are (in the reasonable determination of
          Terra) reasonably prudent investments to be made for an appropriate
          business purpose; and

            (xviii)  Investments by TI in Farmland JV constituting (x) the
          acquisition of not less than 50% of the ownership interests of
          Farmland JV in exchange for the contribution of the Blytheville Assets
          to Farmland JV; and (y) loans and net capital contributions made by
          Terra or one or more of its Subsidiaries to Farmland JV from time to
          time, in an aggregate principal amount not to exceed $10,000,000 at
          any one time outstanding, to finance working capital needs of Farmland
          JV and the purchase by Farmland JV of furnishings, fixtures and
          equipment, real estate and/or equity interests in entities engaged in
          the same or allied lines of business;

             (xix)  Investments by Terra Canada and its Subsidiaries in
          Subsidiaries of Terra Canada;

              (xx)  Investments by BMLP and its Subsidiaries in Subsidiaries of
          BMLP;

             (xxi)  Investments by Terra and its Subsidiaries in members of the
          BMLP Group (including, without limitation, capital contributions by
          the Company, TMC and BMCH to BMLP in respect of Extraordinary Expenses
          pursuant to the terms of the BMLP Partnership Agreement) in an
          aggregate amount not exceeding $30,000,000; provided that:

                    (1)  not more than $25,000,000 of such amount may be capital
               contributions made by the Company, TMC and BMCH to BMLP in
               respect of such Extraordinary Expenses; and

                    (2)  the aggregate amount of insurance, indemnification,
               guarantee and other similar third-party arrangements resulting
               from or relating to Extraordinary Expenses received by
<PAGE>
 
                                    - 108 -

               BMLP and returned to the Company or any of its Subsidiaries
               (other than members of the BMLP Group) shall be deemed to reduce,
               pro tanto, the amount of capital contributions made by the
               Company and such Subsidiaries in respect of Extraordinary
               Expenses;

          (xxii)  additional Investments by Terra and its Subsidiaries in
     members of the Terra Canada Group in an aggregate amount not exceeding
     $10,000,000;

          (xxiii)  additional Investments by Terra and its Subsidiaries in
     Subsidiaries of Terra (other than in members of the Terra Canada Group
     and members of the BMLP Group);

          (xxiv)  additional Investments by Terra and its Subsidiaries in
     Terra or any of its Subsidiaries.

          (g)  Payments to Minority Interests.  Pay or cause to be paid, or
     permit any of its Subsidiaries to pay or cause to be paid, to any holder of
     a minority interest any amount with respect to such minority interest in
     excess of the amount to which such holder is legally entitled, unless Terra
     or such Subsidiary simultaneously receives payment in an amount equal to or
     greater than its ratable share of the amount of the related distribution
     (determined in accordance with the respective interests then held by Terra
     and such Subsidiary, on the one hand, and such holder, on the other),
     provided that the following will not constitute a breach of this Section
     5.02(g):

               (1)  the SPU Redemption;

               (2)  the redemption in whole, but not in part, of the BMLP Class
          A Limited Partnership Interest in accordance with the terms of the
          BMLP Partnership Agreement and the BMLP Support and Option Agreement;
          and

               (3)  payments permitted to be made pursuant to the terms of the
          BMLP Partnership Agreement and the BMLP Support and Option Agreement.

          (h)  Restricted Transactions.  Make any Capital Expenditures or
     Specified Acquisitions, except for:

               (A)  Restricted Transactions for Terra and its Subsidiaries on a
          Consolidated basis, in any fiscal year (the "Subject Fiscal Year") in
          an aggregate amount
<PAGE>
 
                                    - 109 -

          not exceeding the sum of (i) $150,000,000 plus (ii) for fiscal years
          beginning January 1, 1996 and thereafter, the lesser of:

                    (x)  an amount equal to the unused portion (if any) of the
               amount available for Restricted Transactions pursuant to
               paragraph (i) of this Section 5.02(h)(A) for the prior fiscal
               year (provided that this clause (x) shall be determined, with
               respect to all periods prior to the Restatement Date, as provided
               in the Existing Credit Agreement); and

                    (y)  $100,000,000;

          provided that, at the time of each Other Distribution, the amount of
          such Other Distribution shall reduce (but not below zero) the amount
          remaining available for Restricted Transactions pursuant to this
          clause (A) for the then-current fiscal year by the amount of such
          Other Distribution; and

               (B)  Capital Expenditures in connection with the construction of
          the Ammonia Loop in an aggregate amount not exceeding $60,000,000.

          (i)  Change in Nature of Business.  Make, or permit any of its
     Material Subsidiaries to make, any material change in the nature of the
     business of Terra and its Subsidiaries taken as a whole as carried on at
     the Restatement Date.

          (j)  Charter Amendments.  Amend, or permit any of its Material
     Subsidiaries to amend, its articles of incorporation or bylaws, or amend
     any partnership agreement to which it or any of its Subsidiaries is a party
     (except for (1) amendments to authorize the issuance of preferred or common
     stock and (2) in the case of BMLP, the amendment and restatement of its
     agreement of limited partnership at the BMLP Restructuring Time), in each
     case to the extent any such amendment could reasonably be expected to have
     a Material Adverse Effect.

          (k)  Accounting Changes.  Make or permit, or permit any of its
     Subsidiaries to make or permit, any change in accounting policies or
     reporting practices, except as required or permitted by generally accepted
     accounting principles in effect in the United States; provided that in the
     event of any change in generally accepted accounting principles from the
     date of the financial statements referred to in Section 4.01(f) and upon
     delivery of any
<PAGE>
 
                                    - 110 -

     financial statement and accompanying certificate of compliance required to
     be furnished under subsections (b) and (c) of Section 5.03, Terra shall
     deliver to the Lenders a statement of reconciliation conforming any
     information contained in such financial statement and a certificate of
     compliance required to be furnished pursuant to subsections (b) and (c) of
     Section 5.03 with GAAP (it being understood that compliance with financial
     covenants herein shall be measured and determined on the basis of GAAP).

          (l)  Amendment of Sale of Business Agreement, Etc.  Consent to or
     accept any cancellation or termination of the Sale of Business Agreement or
     the Ammonium Nitrate Hedging Agreement, amend, modify or change in any
     manner any material term or condition thereof, waive any default under or
     any breach of any material term or condition thereof, agree in any manner
     to any other amendment, modification or change of any material term or
     condition thereof, or cancel or terminate the Sale of Business Agreement,
     in each case without the prior consent of the Lenders.

          (m)  Certain Obligations Respecting Subsidiaries.  Enter into, or
     permit any of its Subsidiaries (other than a Receivables Subsidiary) to
     enter into, after the Restatement Date, any indenture, agreement,
     instrument or other arrangement that, directly or indirectly, prohibits or
     restrains, or has the effect of prohibiting or restraining, or imposes
     materially adverse conditions upon, the declaration or payment of dividends
     or the making of loans or advances to or Investments in or the sale,
     assignment, transfer or other disposition of property to Terra or any
     Subsidiary thereof (other than a Receivable Subsidiary); provided that:

               (1)  Terra and its Subsidiaries (whether or not Receivables
          Subsidiaries) may include in Permitted Receivables Facilities
          provisions substantially to the effect of those attached as Exhibit A
          to Consent and Amendment No. 2 to the Existing Credit Agreement, dated
          as of July 31, 1996;

               (2)  the BMLP Partnership Agreement (and the certificates of
          incorporation of Subsidiaries of BMLP) may restrict such actions by
          BMLP and its Subsidiaries;

               (3)  the Terra Canada Credit Facility may restrict such actions
          by Terra Canada and its Subsidiaries; and

               (4)  the Terra U.K. Loan Agreement may restrict such actions by
          Terra U.K. and its Subsidiaries.
<PAGE>
 
                                    - 111 -

          (n)  Subordinated Indebtedness.  Purchase, redeem, retire or otherwise
     acquire for value, or set apart any money for a sinking, defeasance or
     other analogous fund for the purchase, redemption, retirement or other
     acquisition of, or make any voluntary payment or prepayment of the
     principal of or interest on, or any other amount owing in respect of, any
     Subordinated Indebtedness (other than Intercompany Debt) (and such Obligor
     will not permit any of its Subsidiaries to do any of the foregoing), in
     each case except for regularly scheduled payments of principal and interest
     in respect thereof required pursuant to the instruments evidencing such
     Subordinated Indebtedness, or amend the documentation creating or
     evidencing such Subordinated Indebtedness.

          (o)  Transactions with Affiliates.  Except to the extent otherwise
     expressly permitted hereunder, enter into any transaction with any
     Affiliate on terms less favorable than would pertain in a transaction
     entered into with a third party on an arm's-length basis.

          (p)  Amendments to Management Agreements.  Without the consent of the
     Administrative Agent, amend, modify or change in any material respect the
     terms or conditions of any Management Agreement.

          (q)  Margin Stock.  Permit more than 25%, after applying the proceeds
     of each Advance, of the value of the assets of either Borrower and such
     Borrower's Subsidiaries (as determined in good faith by such Borrower) that
     are subject to Section 5.02(a) or Section 5.02(e) to consist of or be
     represented by Margin Stock.

          (r)  BMLP Purchase Option.  Permit the Company to transfer or
     otherwise assign (other than to Minorco or one of its Affiliates):

               (x)  any of its rights under Section 2.1 of the BMLP Support and
          Option Agreement to purchase the Class A Limited Partnership Interest;
          or

               (y)  any of its rights under Section 2.2 of the BMLP Support and
          Option Agreement to purchase the "Nova Interests" referred to therein;
          or

     permit any Person other than the Company, Minorco or any of Minorco's
     Affiliates to be the "Class A Purchaser" or "Nova Purchaser" pursuant to
     Section 2.1 or 2.2, respectively, of the BMLP Support and Option Agreement.
<PAGE>
 
                                    - 112 -

          Section 5.03.  Reporting Requirements.  So long as any principal of or
interest on any Advance or any other amount payable under this Agreement shall
remain unpaid, any Letter of Credit shall be outstanding or any Lender shall
have any Commitment hereunder:

          (a)  Default Notice.  Each Obligor will furnish to the Administrative
     Agent, as soon as possible and in any event within five Business Days after
     such Obligor knows or has reason to believe that a Default or Event of
     Default has occurred (which Default or Event of Default is continuing on
     the date of the following statement), a statement of the Senior Financial
     Officer setting forth details of such Default or Event of Default and the
     action that such Obligor has taken and proposes to take with respect
     thereto.

          (b)  Quarterly Financials.  As soon as available and in any event
     within 60 days after the end of each of the first three quarters of each
     fiscal year of Terra, Terra will furnish to the Administrative Agent, with
     sufficient copies for each Lender and each Issuing Bank, a Consolidated
     balance sheet of Terra and its Subsidiaries as of the end of such quarter
     and Consolidated statements of income and cash flows of Terra and its
     Subsidiaries for the period commencing at the end of the previous fiscal
     year and ending with the end of such quarter, setting forth in each case in
     comparative form the corresponding figures for the corresponding period of
     the preceding fiscal year in reasonable detail and duly certified (subject
     to year-end audit adjustments) by the Senior Financial Officer as having
     been prepared in accordance with GAAP, together with (i) a certificate of
     said officer (A) stating that no Default or Event of Default has occurred
     and is continuing or, if a Default or Event of Default has occurred and is
     continuing, a statement as to the nature thereof and the action that Terra
     has taken and proposes to take with respect thereto, (B) stating that since
     December 31, 1996, there has been no Material Adverse Change with respect
     to Terra and (C) providing a comparison between the financial position and
     results of operations set forth in such financial statements with the
     comparable information set forth in the financial projections and budget
     most recently delivered pursuant Section 5.03(l) of the Existing Credit
     Agreement or Section 5.03(l) and (ii) a schedule in form satisfactory to
     the Administrative Agent of the computations used by Terra in determining
     compliance with the covenants contained in Section 5.04.

          (c)  Annual Financials.  As soon as available and in any event within
     110 days after the end of each fiscal year
<PAGE>
 
                                    - 113 -

     of Terra, Terra will furnish to the Administrative Agent, with sufficient
     copies for each Lender and each Issuing Bank, a copy of the annual audit
     report for such year for Terra and its Subsidiaries, including therein a
     Consolidated balance sheet of Terra and its Subsidiaries as of the end of
     such fiscal year and Consolidated statements of income and cash flows of
     Terra and its Subsidiaries for such fiscal year, setting forth in each case
     in comparative form the corresponding figures for the preceding fiscal year
     accompanied by an unqualified opinion of Deloitte & Touche or other
     independent public accountants of nationally recognized standing stating
     that, except as expressly disclosed therein, said Consolidated financial
     statements present fairly, in all material respects, the Consolidated
     financial position and results of operations of Terra and its Consolidated
     Subsidiaries as of the last day of, and for, such fiscal year, together
     with (i) a certificate of such accounting firm to the Lenders stating that
     in the course of the regular audit of the business of Terra and its
     Subsidiaries, which audit was conducted by such accounting firm in
     accordance with generally accepted auditing standards, such accounting firm
     has obtained no knowledge that a Default or Event of Default has occurred
     and is continuing, or if, in the opinion of such accounting firm, a Default
     or Event of Default has occurred and is continuing, a statement as to the
     nature thereof (it being understood that said accountants shall have no
     liability to the Administrative Agent, the Lenders or the Issuing Banks for
     failure to obtain knowledge of any Default or Event of Default), (ii) a
     schedule in form satisfactory to the Administrative Agent of the
     computations used by such accountants in determining, as of the end of such
     fiscal year, compliance with the covenants contained in Section 5.04 and
     (iii) a certificate of the Senior Financial Officer (A) stating that no
     Default or Event of Default has occurred and is continuing or, if a Default
     or Event of Default has occurred and is continuing, a statement as to the
     nature thereof and the action that Terra has taken and proposes to take
     with respect thereto, (B) stating that since December 31, 1996, there has
     been no Material Adverse Change with respect to Terra and (C) providing a
     comparison between the financial position and results of operations set
     forth in such financial statements with the comparable information set
     forth in the financial projections and budget most recently delivered
     pursuant to Section 5.03(l) of the Existing Credit Agreement or Section
     5.03(l).

          (d)  ERISA Events.  Promptly and in any event within 10 Business Days
     after any Obligor knows or has reason to know that any ERISA Event
     (including, for this purpose, a
<PAGE>
 
                                    - 114 -

     reportable event listed in Section 4043(c)(7) of ERISA) with respect to any
     Obligor or any of its ERISA Affiliates has occurred, Terra will furnish to
     the Administrative Agent a statement of the Senior Financial Officer
     describing such ERISA Event and the action, if any, that such Obligor or
     such ERISA Affiliate has taken and proposes to take with respect thereto.

          (e)  Plan Terminations.  Promptly and in any event within 10 Business
     Days after receipt thereof by any Obligor or any of its ERISA Affiliates,
     such Obligor will furnish to the Administrative Agent copies of each notice
     from the PBGC stating its intention to terminate any Plan of any Obligor or
     any of its ERISA Affiliates or to have a trustee appointed to administer
     any such Plan.

          (f)  Plan Annual Reports.  Promptly and in any event within 30 days
     after the filing thereof with the Internal Revenue Service, each Obligor
     will furnish to the Administrative Agent copies of such Schedule B
     (Actuarial Information) to the annual report (Form 5500 Series) with
     respect to each Plan of each Obligor or any of its ERISA Affiliates that is
     then being maintained for employees or former employees of such Person.

          (g)  Multiemployer Plan Notices.  Promptly and in any event within
     five Business Days after receipt thereof by any Obligor or any of its ERISA
     Affiliates from the sponsor of a Multiemployer Plan of any Obligor or any
     of its ERISA Affiliates, such Obligor will furnish to the Administrative
     Agent copies of each notice concerning (i) the imposition of withdrawal
     liability by any such Multiemployer Plan, (ii) the reorganization or
     termination, within the meaning of Title IV of ERISA, of any such
     Multiemployer Plan or (iii) the amount of liability incurred, or that is
     reasonably expected to be incurred, by such Obligor or any of its ERISA
     Affiliates in connection with any event described in clause (i) or (ii).

          (h)  Litigation.  Promptly after the commencement thereof, Terra will
     furnish to the Administrative Agent notice of all actions, suits,
     investigations, litigation and proceedings before any court or governmental
     department, commission, board, bureau, agency or instrumentality, domestic
     or foreign, affecting any Obligor or any of its Subsidiaries of the type
     described in Section 4.01(h).

          (i)  Environmental Conditions.  Promptly after receiving notice
     thereof, Terra will furnish to the Administrative Agent notice of any
     condition or occurrence
<PAGE>
 
                                    - 115 -

     on any property of any Obligor that results in a material noncompliance by
     any Obligor or any of its Subsidiaries with any Environmental Law or
     Environmental Permit which noncompliance could reasonably be expected to
     have a Material Adverse Effect, or could (i) form the basis of an
     Environmental Action against any Obligor or any of its Subsidiaries or such
     property that could reasonably be expected to have a Material Adverse
     Effect or (ii) cause any such property to be subject to any restrictions on
     ownership, occupancy, use or transferability under any Environmental Law
     that could reasonably be expected to have Material Adverse Effect.

          (j)  Public Filings.  Terra shall, promptly upon their becoming
     available, deliver to the Administrative Agent, each Issuing Bank and each
     Lender copies of all registration statements and regular periodic reports,
     if any, that Terra, the Company or TNCLP shall have filed with the
     Securities and Exchange Commission (or any governmental agency substituted
     therefor) or any national securities exchange.

          (k)  Shareholder Reports, Etc.  Terra shall deliver to the
     Administrative Agent, each Issuing Bank and each Lender promptly upon the
     mailing thereof to the shareholders of Terra or TNCLP generally or to
     holders of Subordinated Indebtedness or 1995 Terra Debt generally, copies
     of all financial statements and proxy statements so mailed.

          (l)  Financial Projections and Budget.  As soon as available and in
     any event within 110 days after the first day of each fiscal year of Terra,
     Terra will furnish to the Administrative Agent, with sufficient copies for
     each Lender and each Issuing Bank, financial projections and a budget for
     such fiscal year and each subsequent fiscal year of Terra to and including
     the fiscal year in which the Terra Commitment Termination Date is scheduled
     to occur, in each case in form and detail similar to the financial
     projections and budget delivered under Section 5.03(l) of the Existing
     Credit Agreement.

          (m)  Other Information.  Each Obligor shall furnish to the Lenders
     through the Administrative Agent such other information respecting the
     business, condition (financial or otherwise), operations, performance,
     properties or prospects of any Obligor or any of its Subsidiaries as the
     Administrative Agent, any Issuing Bank or any Lender may from time to time
     reasonably request.
<PAGE>
 
                                    - 116 -

          Section 5.04.  Financial Covenants.  So long as any principal of or
interest on any Advance or any other amount payable under this Agreement shall
remain unpaid, any Letter of Credit shall be outstanding or any Lender shall
have any Commitment hereunder, Terra will:

          (a)  Debt to Cash Flow Ratio.  Maintain the Debt to Cash Flow Ratio at
     not more than the ratio set forth below for each Rolling Period ending in
     the respective periods set forth below:

               Each
          Rolling Period
            Ending In                   Ratio
          --------------                -----

          March and December        3.00 to 1.00
            of each fiscal year

          June and September        3.50 to 1.00
            of each fiscal year

          (b)  Adjusted Debt to Cash Flow Ratio.  Maintain the Adjusted Debt to
     Cash Flow Ratio at not more than the ratio set forth below for each Rolling
     Period ending in the respective periods set forth below:

               Each
          Rolling Period
            Ending In                   Ratio
          --------------                -----

          March and December        3.00 to 1.00
            of each fiscal year

          June and September        3.50 to 1.00
            of each fiscal year

          (c)  Interest Coverage Ratio.  Maintain the Interest Coverage Ratio
     for each Rolling Period at not less than 3.50 to 1.00.

          (d)  Adjusted Interest Coverage Ratio.  Maintain the Adjusted Interest
     Coverage Ratio for each Rolling Period at not less than 3.50 to 1.00.

          (e)  Net Worth.  Maintain the Net Worth of Terra on each day of not
     less than (i) $550,000,000 plus (ii) the aggregate increase in the amount
     of capital stock and additional paid-in capital of Terra subsequent to the
     Restatement Date plus (iii) 50% of net income of Terra and its Subsidiaries
     on a Consolidated basis (if positive) for
<PAGE>
 
                                    - 117 -

     each fiscal year of Terra ending on or after December 31, 1997.

          (f)  Adjusted Net Worth.  Maintain Adjusted Net Worth on each day of
     not less than (i) $250,000,000 plus (ii) the aggregate increase in the
     amount of capital stock and additional paid-in capital of Terra subsequent
     to the Restatement Date plus (iii) 50% of net income (if positive) of the
     Adjusted Terra Group on a Consolidated basis for each fiscal year of Terra
     ending on or after December 31, 1997.


                                  ARTICLE VI

                               EVENTS OF DEFAULT

          Section 6.01.  Events of Default.  If any of the following events
("Events of Default") shall occur and be continuing:

          (a)  either Borrower (i) shall fail to pay when due any principal of
     any Advance made to it or (ii) shall fail for three Business Days to pay
     when due any interest on any Advance made to it or any other amount payable
     by it under any Loan Document; or

          (b)  any representation or warranty made by any Obligor (or any of its
     officers) under or in connection with any Loan Document shall prove to have
     been incorrect in any material respect when made; or

          (c)  any Obligor shall fail to perform or observe any term, covenant
     or agreement contained in clause (o) of Section 5.01, or clause (a), (b),
     (c), (d), (e), (g), (i), (q) or (r) of Section 5.02, or clause (a), (e) or
     (i) of Section 5.03, or Section 5.04; or

          (d)  Terra shall fail to pay and perform its obligations under the
     Loan Purchase Agreement; or

          (e)  any Obligor shall fail to perform any other term, covenant or
     agreement contained in any Loan Document on its part to be performed or
     observed if such failure shall remain unremedied for a period of 30 days;
     or

          (f)  any Obligor or any of its Material Subsidiaries shall fail to pay
     any principal of, premium or interest on or any other amount payable in
     respect of any Debt that is outstanding in a principal or notional amount
     of at least $10,000,000 in the aggregate (but excluding Debt outstanding
<PAGE>
 
                                    - 118 -

     hereunder) of such Obligor or such Subsidiary (as the case may be), when
     the same becomes due and payable (whether by scheduled maturity, required
     prepayment, acceleration, demand or otherwise), and such failure shall
     continue after the applicable grace period, if any, specified in the
     agreement or instrument relating to such Debt; or any other event shall
     occur or condition shall exist under any agreement or instrument relating
     to any such Debt and shall continue after the applicable grace period, if
     any, specified in such agreement or instrument, if the effect of such event
     or condition is to accelerate, or to permit the acceleration of, the
     maturity of such Debt or otherwise to cause, or to permit the holder or
     holders (or an agent or trustee on its or their behalf) thereof to cause,
     such Debt to mature; or any such Debt shall be declared to be due and
     payable or required to be prepaid or redeemed (other than by a regularly
     scheduled required prepayment or redemption), purchased or defeased, or an
     offer to prepay, redeem, purchase or defease such Debt shall be required to
     be made, in each case prior to the stated maturity thereof; or

          (g)  any Obligor or any of its Material Subsidiaries shall generally
     not pay its debts as such debts become due, or shall admit in writing its
     inability to pay its debts generally, or shall make a general assignment
     for the benefit of creditors; or any proceeding shall be instituted by or
     against any Obligor or any of its Material Subsidiaries seeking to
     adjudicate it a bankrupt or insolvent, or seeking liquidation, winding up,
     reorganization, arrangement, adjustment, protection, relief, or composition
     of it or its debts under any law relating to bankruptcy, insolvency or
     reorganization or relief of debtors, or seeking the entry of an order for
     relief or the appointment of a receiver, trustee, or other similar official
     for it or for any substantial part of its property and, in the case of any
     such proceeding instituted against it (but not instituted by it) that is
     being diligently contested by it in good faith, either such proceeding
     shall remain undismissed or unstayed for a period of 60 days or any of the
     actions sought in such proceeding (including, without limitation, the entry
     of an order for relief against, or the appointment of a receiver, trustee,
     custodian or other similar official for, it or any substantial part of its
     property) shall occur; or any Obligor or any of its Material Subsidiaries
     shall take any corporate or partnership action to authorize any of the
     actions set forth above in this subsection (g); or

          (h)  any judgment or order for the payment of money in excess of
     $10,000,000 shall be rendered against any Obligor
<PAGE>
 
                                    - 119 -

     or any of its Material Subsidiaries and either (i) enforcement proceedings
     shall have been commenced by any creditor upon such judgment or order or
     (ii) there shall be any period of 30 consecutive days during which a stay
     of enforcement of such judgment or order, by reason of a pending appeal or
     otherwise, shall not be in effect, unless such judgment or order shall have
     been vacated, satisfied or dismissed or bonded pending appeal; or

          (i)  any non-monetary judgment or order shall be rendered against any
     Obligor or any of its Subsidiaries that could be reasonably likely to have
     a Material Adverse Effect, and there shall be any period of 30 consecutive
     days during which a stay of enforcement of such judgment or order, by
     reason of a pending appeal or otherwise, shall not be in effect unless such
     judgment or order shall have been vacated, satisfied, discharged or bonded
     pending appeal; or

          (j)  any Security Document shall for any reason (other than pursuant
     to the terms hereof and thereof) cease to create a valid and perfected
     first priority Lien (subject only to Permitted Liens) on the Collateral
     purported to be covered thereby; or

          (k)  Minorco ceases to own, directly or indirectly, at least 20% of
     the issued and outstanding shares of voting capital stock of Terra; or
     Minorco ceases to hold, directly or indirectly, a plurality of the issued
     and outstanding shares of capital stock of Terra; or

          (l)  any ERISA Event shall have occurred with respect to a Plan of any
     Obligor or any of its ERISA Affiliates and the amount (determined as of the
     date of occurrence of such ERISA Event) of the Insufficiency of such Plan
     and the Insufficiency of any and all other Plans of the Obligors and their
     ERISA Affiliates with respect to which an ERISA Event shall have occurred
     and then exist (or the liability of the Obligors and their ERISA Affiliates
     related to such ERISA Event) could reasonably be expected to have a
     Material Adverse Effect; provided that with respect to any Multiple
     Employer Plan, such Insufficiency shall include only the portion thereof
     attributable to such Obligor or its ERISA Affiliates; or

          (m)  any Obligor or any of its ERISA Affiliates shall have been
     notified by the sponsor of a Multiemployer Plan of any Obligor or any of
     its ERISA Affiliates that it has incurred withdrawal liability to such
     Multiemployer Plan in an amount that, when aggregated with all other
     amounts required to be paid to Multiemployer Plans by the Obligors
<PAGE>
 
                                    - 120 -

     and their ERISA Affiliates as withdrawal liability (determined as of the
     date of such notification), could reasonably be expected to have a Material
     Adverse Effect; or

          (n)  any Obligor or any of its ERISA Affiliates shall have been
     notified by the sponsor of a Multiemployer Plan of any Obligor or any of
     its ERISA Affiliates that such Multiemployer Plan is in reorganization or
     is being terminated, within the meaning of Title IV of ERISA, and as a
     result of such reorganization or termination the aggregate annual
     contributions of the Obligors and their ERISA Affiliates to all
     Multiemployer Plans that are then in reorganization or being terminated
     have been or will be increased over the amounts contributed to such
     Multiemployer Plans for the plan years of such Multiemployer Plans
     immediately preceding the plan year in which such reorganization or
     termination occurs by an amount that could reasonably be expected to have a
     Material Adverse Effect; or

          (o)  there shall have been asserted against Terra or any of its
     Subsidiaries an Environmental Claim that, in the judgment of the Required
     Lenders, is reasonably likely to be determined adversely to Terra or any of
     its Subsidiaries, and the amount thereof (either individually or in the
     aggregate) is reasonably likely to have a Material Adverse Effect (insofar
     as such amount is payable by Terra or any of its Subsidiaries but after
     deducting any portion thereof that is reasonably expected to be paid by
     other creditworthy Persons); or

          (p)  any Notice Event (other than the Notice Event set forth in clause
     (a) of the definition thereof) shall occur under the BMLP Partnership
     Agreement and such Notice Event shall not be cured (or deemed cured) or
     waived within 30 days (with the term "Notice Event" having the meaning
     assigned to such term in the BMLP Partnership Agreement);

then, and in any such event, the Administrative Agent (i) shall at the request,
or may with the consent, of the Required Lenders, by notice to the Borrowers,
declare the obligation of each Lender to make Advances and of each Issuing Bank
to issue Letters of Credit to be terminated, whereupon the same shall forthwith
terminate (and this clause (i) shall also be applicable if there shall occur a
Purchase Event), and (ii) shall at the request, or may with the consent, of the
Required Lenders, by notice to the Borrowers, declare the Advances and the
Notes, all interest thereon and all other amounts payable under this Agreement
and the other Loan Documents to be forthwith due and payable, whereupon the
Advances and the Notes, all such interest and all such amounts shall become and
be forthwith due and payable,
<PAGE>
 
                                    - 121 -

without presentment, demand, protest or further notice of any kind, all of which
are hereby expressly waived by the Borrowers; provided that in the event of an
actual or deemed entry of an order for relief with respect to any Obligor or any
of its Subsidiaries under the Federal Bankruptcy Code, (x) the obligation of
each Lender to make Advances and of any Issuing Bank to issue Letters of Credit
shall automatically be terminated and (y) the Advances and the Notes, all such
interest and all such amounts shall automatically become and be due and payable,
without presentment, demand, protest or any notice of any kind, all of which are
hereby expressly waived by the Borrowers.

          Section 6.02.  Actions in Respect of the Letters of Credit Upon
Default. If any Event of Default shall have occurred and be continuing, the
Administrative Agent may, irrespective of whether it is taking any of the
actions described in Section 6.01 or otherwise, make demand upon the Borrowers
to, and forthwith upon such demand the Borrowers will, pay to the Administrative
Agent on behalf of the Lenders in same day funds at the Administrative Agent's
Office, for deposit in the relevant L/C Cash Collateral Account, an amount equal
to the aggregate Available Amount of all Letters of Credit then outstanding,
which funds shall be retained by the Administrative Agent in the relevant L/C
Collateral Account as collateral security for the Letter of Credit Liabilities
until such time as the Letters of Credit shall have been terminated and all of
such Letter of Credit Liabilities paid in full.

          If at any time the Administrative Agent determines that any funds held
in the relevant L/C Cash Collateral Account are subject to any right or claim of
any Person other than the Administrative Agent and the Lenders or that the total
amount of such funds is less than the aggregate Available Amount of all Letters
of Credit, the Borrowers will, forthwith upon demand by the Administrative
Agent, pay to the Administrative Agent, as additional funds to be deposited and
held in the relevant L/C Cash Collateral Account, an amount equal to the excess
of (a) such aggregate Available Amount over (b) the total amount of funds, if
any, then held in such L/C Cash Collateral Account that the Administrative Agent
determines to be free and clear of any such right and claim.
<PAGE>
 
                                    - 122 -

                                  ARTICLE VII

                           THE ADMINISTRATIVE AGENT

          Section 7.01.  Authorization and Action.  Each Lender and each Issuing
Bank hereby appoints and authorizes the Administrative Agent to take such action
as agent on its behalf and to exercise such powers and discretion under this
Agreement and the other Basic Documents as are delegated to the Administrative
Agent by the terms hereof and thereof, together with such powers and discretion
as are reasonably incidental thereto. As to any matters not expressly provided
for by the Basic Documents, including, without limitation, enforcement or
collection of the Notes, the Administrative Agent shall not be required to
exercise any discretion or take any action, and shall not be required to act or
to refrain from acting (and shall be fully protected in so acting or refraining
from acting) except upon the instructions of the Required Lenders, and such
instructions shall be binding upon all Lenders and all holders of the Notes;
provided that the Administrative Agent shall not be required to take any action
that exposes it to personal liability or that is contrary to this Agreement or
applicable law. The Administrative Agent agrees to give to each Issuing Bank and
each Lender prompt notice of each notice given to it by the Borrowers or Terra
pursuant to the terms of this Agreement.

          Each Lender and Issuing Bank:

          (1)  hereby authorizes the Administrative Agent to execute and deliver
     the Intercreditor Agreement, and each Lender and Issuing Bank agrees that,
     upon such execution and delivery, it will be bound thereby as if such
     Lender or Issuing Bank, as the case may be, were a signatory thereto;

          (2)  hereby authorizes the Administrative Agent to execute and deliver
     the Loan Purchase Agreement, and each Lender and Issuing Bank agrees that,
     upon such execution and delivery, it will be bound thereby as if such
     Lender or Issuing Bank, as the case may be, were a signatory thereto; and

          (3)  hereby authorizes the Collateral Agent to execute and deliver
     each of the Security Documents and the Intercreditor Agreement.

          Section 7.02.  Administrative Agent's Reliance, Etc.  Neither the
Administrative Agent nor any of its respective directors, officers, agents or
employees shall be liable for any action taken or omitted to be taken by it or
them under or in connection with the Basic Documents, except for its or their
own
<PAGE>
 
                                    - 123 -

gross negligence or willful misconduct. Without limitation of the generality of
the foregoing, the Administrative Agent (i) may treat the payee of any Note as
the holder thereof until the Administrative Agent receives and accepts an
Assignment and Acceptance entered into by the Lender that is the payee of such
Note, as assignor, and an Eligible Assignee, as assignee, as provided in Section
9.07; (ii) may consult with legal counsel (including counsel for any Obligor),
independent public accountants and other experts selected by it and shall not be
liable for any action taken or omitted to be taken in good faith by them in
accordance with the advice of such counsel, accountants or experts; (iii) makes
no warranty or representation to any Issuing Bank or any Lender and shall not be
responsible to any of them for any statements, warranties or representations
made in or in connection with the Loan Documents; (iv) shall not have any duty
to ascertain or to inquire as to the performance or observance of any of the
terms, covenants or conditions of any Loan Document on the part of any Obligor
or to inspect the property (including the books and records) of any Obligor; (v)
shall not be responsible to any Issuing Bank or any Lender for the due
execution, legality, validity, enforceability, genuineness, sufficiency or value
of any Basic Document or any other instrument or document furnished pursuant
hereto; and (vi) shall incur no liability under or in respect of any Basic
Document by acting upon any notice, consent, certificate or other instrument or
writing (which may be by telegram, telecopy, cable or telex) believed by it to
be genuine and signed or sent by the proper party or parties.

          Section 7.03.  Citibank and Affiliates.  With respect to its
Commitments, the Advances made by it and the Notes issued to it, Citibank shall
have the same rights and powers under the Basic Documents as any other Lender
and may exercise the same as though it were not the Administrative Agent or the
Collateral Agent; and the term "Lender" or "Lenders" shall, unless otherwise
expressly indicated, include Citibank in its individual capacity. Citibank and
its Affiliates may accept deposits from, lend money to, act as trustee under
indentures for, accept investment banking engagements from and generally engage
in any kind of business with, any Obligor, any of its Subsidiaries, any of its
Affiliates and any Person who may do business with or own securities of any
Obligor or any such Subsidiary or Affiliate, all as if Citibank were not the
Administrative Agent and without any duty to account therefor to the Lenders or
any Issuing Bank.

          Section 7.04.  Lender Credit Decision.  Each Lender and each Issuing
Bank acknowledges that it has, independently and without reliance upon the
Administrative Agent, any Issuing Bank or any other Lender and based on the
financial statements referred to in Section 4.01 and such other documents and
<PAGE>
 
                                    - 124 -

information as it has deemed appropriate, made its own credit analysis and
decision to enter into this Agreement. Each Lender and each Issuing Bank also
acknowledges that it will, independently and without reliance upon the
Administrative Agent, any Issuing Bank or any other Lender and based on such
documents and information as it shall deem appropriate at the time, continue to
make its own credit decisions in taking or not taking action under this
Agreement.

          Section 7.05. Indemnification. The Lenders agree to indemnify the
Administrative Agent (to the extent not promptly reimbursed by the Borrowers),
ratably according to the principal amounts of the Notes then held by each of
them (or if no Advances are at the time outstanding, ratably according to the
amounts of their Commitments), from and against any and all liabilities,
obligations, losses, damages, penalties, actions, judgments, suits, costs,
expenses or disbursements of any kind or nature whatsoever that may be imposed
on, incurred by, or asserted against any of them in any way relating to or
arising out of the Basic Documents or any action taken or omitted by any of them
under the Basic Documents; provided that no Lender shall be liable for any
portion of such liabilities, obligations, losses, damages, penalties, actions,
judgments, suits, costs, expenses or disbursements resulting from the gross
negligence or willful misconduct of the Administrative Agent. Without limitation
of the foregoing, each Lender agrees to reimburse (x) the Administrative Agent
promptly upon demand for its ratable share of any costs and expenses payable by
the Borrowers under Section 9.04 of this Agreement and (y) the Collateral Agent
under the Security Documents, in each case to the extent that the Administrative
Agent or the Collateral Agent, as the case may be, is not promptly reimbursed
for such costs and expenses by the Borrowers.

          Section 7.06.  Collateral Duties.
                         ----------------- 
          (a)  Except for action expressly required of the Administrative Agent
hereunder and under the other Basic Documents, the Administrative Agent shall in
all cases be fully justified in refusing to act hereunder and thereunder unless
it shall be further indemnified to its satisfaction by the Lenders and the
Issuing Banks proportionately in accordance with the Obligations then due and
payable to each of them against any and all liability and expense that may be
incurred by it by reason of taking or continuing to take any such action.

          (b)  Except as expressly provided herein, the Administrative Agent
shall have no duty to take any affirmative steps with respect to the collection
of amounts payable in
<PAGE>
 
                                    - 125 -

respect of the Collateral. The Administrative Agent shall incur no liability as
a result of any private sale of the Collateral.

          (c)  The Lenders and the Issuing Banks hereby consent, and agree upon
written request by the Collateral Agent or the Administrative Agent to execute
and deliver such instruments and other documents as the Collateral Agent or
Administrative Agent may deem desirable to confirm such consent, to the release
of the Liens on any of the Collateral, including any release in connection with
any sale, transfer or other disposition of the Collateral or any part thereof in
accordance with the Basic Documents.

          (d)  The parties hereto acknowledge that each of the Collateral Agent
and the Administrative Agent shall be deemed to have exercised reasonable care
in the custody and preservation of the Collateral in its possession if the
Collateral is accorded treatment substantially equal to that which the
Collateral Agent or the Administrative Agent, as the case may be, accords its
own property, it being understood that none of the Collateral Agent, the
Administrative Agent, any Lender or any Issuing Bank shall have responsibility
for (a) ascertaining or taking action with respect to calls, conversions,
exchanges, maturities, tenders or other matters relative to any Collateral,
whether or not the Collateral Agent, Administrative Agent, any Lender or any
Issuing Bank has or is deemed to have knowledge of such matters, or (b) taking
any necessary steps to preserve rights against any parties with respect to any
Collateral.

          Section 7.07.  Successor Administrative Agent. The Administrative
Agent may resign at any time by giving written notice thereof to the Issuing
Banks, the Lenders and the Borrowers and may be removed at any time with or
without cause by the Required Lenders. Upon any such resignation or removal, the
Required Lenders shall have the right to appoint (subject, so long as no Default
or Event of Default has occurred and is continuing, to the consent of the
Borrowers, which consent shall not be unreasonably withheld) a successor
Administrative Agent. If no successor Administrative Agent shall have been so
appointed by the Required Lenders, and shall have accepted such appointment,
within 30 days after the retiring Administrative Agent's giving of notice of
resignation or the Required Lenders' removal of the Administrative Agent, as the
case may be, then the retiring Administrative Agent may, on behalf of the
Issuing Banks and the Lenders, appoint (subject, so long as no Default or Event
of Default has occurred and is continuing, to the consent of the Borrowers,
which consent shall not be unreasonably withheld) a successor Administrative
Agent, which shall be an Initial Lender or a commercial bank organized under the
laws of the United States or of any State thereof and having a combined capital
and
<PAGE>
 
                                    - 126 -

surplus of at least $500,000,000. Upon the acceptance of any appointment as
Administrative Agent hereunder by a successor Administrative Agent such
successor Administrative Agent shall succeed to and become vested with all the
rights, powers, discretion, privileges and duties of the retiring Administrative
Agent, as the case may be, and such retiring Administrative Agent shall be
discharged from its duties and obligations under the Basic Documents. After any
retiring Administrative Agent's resignation or removal hereunder as
Administrative Agent, the provisions of this Article VII shall inure to the
benefit of the Administrative Agent as to any actions taken or omitted to be
taken by it while it was Administrative Agent under this Agreement and under the
Security Documents.

                                 ARTICLE VIII

                                 THE GUARANTEE

          Section 8.01.  The Guarantee.
                         ------------- 
          (a)  The Terra Guarantors hereby jointly and severally guarantee to
each Lender, each Issuing Bank and the Administrative Agent and their respective
successors and assigns the prompt payment in full when due (whether at stated
maturity, by acceleration or otherwise) of the principal of and interest on the
Terra Advances made by the Lenders to, and the Notes held by each Lender of, the
Company and all other amounts from time to time owing to the Lenders, each
Issuing Bank or the Administrative Agent by the Company under this Agreement and
under the Notes and by any Terra Obligor under any of the other Loan Documents,
in each case strictly in accordance with the terms thereof (such obligations
being herein collectively called the "Terra Guaranteed Obligations"). The Terra
Guarantors hereby further jointly and severally agree that if the Company shall
fail to pay in full when due (whether at stated maturity, by acceleration or
otherwise) any of the Terra Guaranteed Obligations, the Terra Guarantors will
promptly pay the same, without any demand or notice whatsoever, and that in the
case of any extension of time of payment or renewal of any of the Terra
Guaranteed Obligations, the same will be promptly paid in full when due (whether
at extended maturity, by acceleration or otherwise) in accordance with the terms
of such extension or renewal.

          (b)  The TNLP Guarantors hereby jointly and severally guarantee to
each Lender, each Issuing Bank and the Administrative Agent and their respective
successors and assigns the prompt payment in full when due (whether at stated
maturity, by acceleration or otherwise) of the principal of and interest on
<PAGE>
 
                                    - 127 -

the TNLP Advances made by the Lenders to, and the Notes held by each Lender of,
TNLP and all other amounts from time to time owing to the Lenders, each Issuing
Bank or the Administrative Agent by TNLP under this Agreement and under the
Notes and by any TNLP Obligor under any of the other Loan Documents, in each
case strictly in accordance with the terms thereof (such obligations being
herein collectively called the "TNLP Guaranteed Obligations"). The TNLP
Guarantors hereby further jointly and severally agree that if TNLP shall fail to
pay in full when due (whether at stated maturity, by acceleration or otherwise)
any of the TNLP Guaranteed Obligations, the TNLP Guarantors will promptly pay
the same, without any demand or notice whatsoever, and that in the case of any
extension of time of payment or renewal of any of the TNLP Guaranteed
Obligations, the same will be promptly paid in full when due (whether at
extended maturity, by acceleration or otherwise) in accordance with the terms of
such extension or renewal.

          Section 8.02.  Obligations Unconditional.
                         ------------------------- 
          (a)  The obligations of the Terra Guarantors under Section 8.01 are
absolute and unconditional, joint and several, irrespective of the value,
genuineness, validity, regularity or enforceability of the obligations of the
Company under this Agreement, the Notes or any other agreement or instrument
referred to herein or therein, or any substitution, release or exchange of any
other guarantee of or security for any of the Terra Guaranteed Obligations, and,
to the fullest extent permitted by applicable law, irrespective of any other
circumstance whatsoever that might otherwise constitute a legal or equitable
discharge or defense of a surety or guarantor, it being the intent of this
Section 8.02 that the obligations of the Terra Guarantors hereunder shall be
absolute and unconditional, joint and several, under any and all circumstances.

          (b)  The obligations of the TNLP Guarantors under Section 8.01 are
absolute and unconditional, joint and several, irrespective of the value,
genuineness, validity, regularity or enforceability of the obligations of TNLP
under this Agreement, the Notes or any other agreement or instrument referred to
herein or therein, or any substitution, release or exchange of any other
guarantee of or security for any of the TNLP Guaranteed Obligations, and, to the
fullest extent permitted by applicable law, irrespective of any other
circumstance whatsoever that might otherwise constitute a legal or equitable
discharge or defense of a surety or guarantor, it being the intent of this
Section 8.02 that the obligations of the TNLP Guarantors hereunder shall be
absolute and unconditional, joint and several, under any and all circumstances.
<PAGE>
 
                                    - 128 -

          (c)  Without limiting the generality of the foregoing clauses (a) and
(b), it is agreed that the occurrence of any one or more of the following shall
not alter or impair the liability of the Guarantors hereunder which shall remain
absolute and unconditional as described above:

          (i)  at any time or from time to time, without notice to the
     Guarantors, the time for any performance of or compliance with any of the
     Guaranteed Obligations shall be extended, or such performance or compliance
     shall be waived;

         (ii)  any of the acts mentioned in any of the provisions of this
     Agreement or the Notes or any other agreement or instrument referred to
     herein or therein shall be done or omitted;

        (iii)  the maturity of any of the Guaranteed Obligations shall be
     accelerated, or any of the Guaranteed Obligations shall be modified,
     supplemented or amended in any respect, or any right under this Agreement
     or the Notes or any other agreement or instrument referred to herein or
     therein shall be waived or any other guarantee of any of the Guaranteed
     Obligations or any security therefor shall be released or exchanged in
     whole or in part or otherwise dealt with; or

         (iv)  any lien or security interest granted to, or in favor of, the
     Administrative Agent, any Issuing Bank or any Lender as security for any of
     the Guaranteed Obligations shall fail to be perfected.

The Guarantors hereby expressly waive diligence, presentment, demand of payment,
protest and all notices whatsoever, and any requirement that the Administrative
Agent, any Issuing Bank or any Lender exhaust any right, power or remedy or
proceed against either Borrower under this Agreement or the Notes or any other
agreement or instrument referred to herein or therein, or against any other
Person under any other guarantee of, or security for, any of the Guaranteed
Obligations.

          Section 8.03.  Reinstatement.  The obligations of the Guarantors under
this Article VIII shall be automatically reinstated if and to the extent that
for any reason any payment by or on behalf of the relevant Borrower in respect
of the relevant Guaranteed Obligations is rescinded or must be otherwise
restored by any holder of any of the relevant Guaranteed Obligations, whether as
a result of any proceedings in bankruptcy or reorganization or otherwise, and
the relevant Guarantors jointly and severally agree that they will indemnify the
Administrative Agent, each Issuing Bank and each Lender on demand for all
reasonable costs and expenses (including, without
<PAGE>
 
                                    - 129 -


limitation, fees of counsel) incurred by the Administrative Agent, such Issuing
Bank or such Lender in connection with such rescission or restoration, including
any such costs and expenses incurred in defending against any claim alleging
that such payment constituted a preference, fraudulent transfer or similar
payment under any bankruptcy, insolvency or similar law.

          Section 8.04.  Subrogation.  To the extent that, as a result of this
Article VIII, any Lender or Issuing Bank would be subject to an extended
preference period under Section 547 of the Bankruptcy Code, each Guarantor
hereby waives all rights of subrogation, whether arising by contract or
operation of law (including, without limitation, any such right arising under
the Bankruptcy Code) or otherwise, by reason of any payment by it pursuant to
the provisions of this Article VIII and agrees with the relevant Borrower for
the benefit of each of its creditors (including, without limitation, each
Lender, each Issuing Bank and the Administrative Agent) that any such payment by
it shall constitute a contribution of capital by such Guarantor to the relevant
Borrower (or an investment in the equity capital of the relevant Borrower by
such Guarantor).

          Section 8.05.  Remedies.  The Guarantors jointly and severally agree
that, as between the Guarantors and the Lenders and the Issuing Banks, the
obligations of the Borrowers under this Agreement and the Notes may be declared
to be forthwith due and payable as provided in Article VI (and shall be deemed
to have become automatically due and payable in the circumstances provided in
said Article VI) for purposes of Section 8.01 notwithstanding any stay,
injunction or other prohibition preventing such declaration (or such obligations
from becoming automatically due and payable) as against the relevant Borrower
and that, in the event of such declaration (or such obligations being deemed to
have become automatically due and payable), such obligations (whether or not due
and payable by the relevant Borrower) shall forthwith become due and payable by
the Guarantors for purposes of said Section 8.01.

          Section 8.06.  Instrument for the Payment of Money.  Each Guarantor
hereby acknowledges that the guarantee in this Article VIII constitutes an
instrument for the payment of money, and consents and agrees that any Lender,
any Issuing Bank or the Administrative Agent, at its sole option, in the event
of a dispute by such Guarantor in the payment of any moneys due hereunder, shall
have the right to bring motion-action under New York CPLR Section 3213.

          Section 8.07.  Continuing Guarantee.  The guarantee in this Article
VIII is a continuing guarantee, and shall apply to all Guaranteed Obligations
whenever arising.


<PAGE>
 
                                    - 130 -


          Section 8.08.  Rights of Contribution.  The Subsidiary Guarantors
hereby agree, as between themselves, that if any Subsidiary Guarantor shall
become an Excess Funding Guarantor (as defined below) by reason of the payment
by such Subsidiary Guarantor of any Guaranteed Obligations, each other
Subsidiary Guarantor shall, on demand of such Excess Funding Guarantor (but
subject to the next sentence), pay to such Excess Funding Guarantor an amount
equal to such Subsidiary Guarantor's Pro Rata Portion (as defined below and
determined, for this purpose, without reference to the properties, debts and
liabilities of such Excess Funding Guarantor) of the Excess Payment (as defined
below) in respect of such Guaranteed Obligations. The payment obligation of a
Subsidiary Guarantor to any Excess Funding Guarantor under this Section 8.08
shall be subordinate and subject in right of payment to the prior payment in
full of the obligations of such Subsidiary Guarantor under the other provisions
of this Article VIII and such Excess Funding Guarantor shall not exercise any
right or remedy with respect to such excess until payment and satisfaction in
full of all of such obligations.

          For purposes of this Section 8.08, (i) "Excess Funding Guarantor"
shall mean, in respect of any Guaranteed Obligations, a Subsidiary Guarantor
that has paid an amount in excess of its Pro Rata Portion of such Guaranteed
Obligations, (ii) "Excess Payment" shall mean, in respect of any Guaranteed
Obligations, the amount paid by an Excess Funding Guarantor in excess of its Pro
Rata Portion of such Guaranteed Obligations and (iii) "Pro Rata Portion" shall
mean, for any Subsidiary Guarantor, the ratio (expressed as a percentage) of (x)
the amount by which the aggregate present fair saleable value of all properties
of such Subsidiary Guarantor (excluding any shares of stock of any other
Subsidiary Guarantor) exceeds the amount of all the debts and liabilities of
such Subsidiary Guarantor (including contingent, subordinated, unmatured and
unliquidated liabilities, but excluding the obligations of such Subsidiary
Guarantor hereunder and any obligations of any other Subsidiary Guarantor that
have been Guaranteed by such Subsidiary Guarantor) to (y) the amount by which
the aggregate fair saleable value of all properties of the Company and all of
the Subsidiary Guarantors exceeds the amount of all the debts and liabilities
(including contingent, subordinated, unmatured and unliquidated liabilities, but
excluding the obligations of the Company and the Subsidiary Guarantors
hereunder) of the Company and all of the Subsidiary Guarantors, all as of the
Restatement Date. If any Subsidiary becomes a Subsidiary Guarantor hereunder
subsequent to the Restatement Date, then for purposes of this Section 8.08 such
subsequent Subsidiary Guarantor shall be deemed to have been a Subsidiary
Guarantor as of the Restatement Date and the aggregate present fair saleable
value of the properties, and the amount of


<PAGE>
 
                                    - 131 -


the debts and liabilities, of such Subsidiary Guarantor as of the Restatement
Date shall be deemed to be equal to such value and amount on the date such
Subsidiary Guarantor becomes a Subsidiary Guarantor hereunder.

          Section 8.09.  General Limitation on Guarantee Obligations.  In any
action or proceeding involving any state corporate law, or any state or Federal
bankruptcy, insolvency, reorganization or other law affecting the rights of
creditors generally, if the obligations of any Guarantor under Section 8.01
would otherwise, taking into account the provisions of Section 8.08, be held or
determined to be void, invalid or unenforceable, or subordinated to the claims
of any other creditors, on account of the amount of its liability under said
Section 8.01, then, notwithstanding any other provision hereof to the contrary,
the amount of such liability shall, without any further action by such
Guarantor, any Lender, any Issuing Bank, the Administrative Agent or any other
Person, be automatically limited and reduced to the highest amount that is valid
and enforceable and not subordinated to the claims of other creditors as
determined in such action or proceeding.


                                   ARTICLE IX

                                 MISCELLANEOUS

          Section 9.01.  Amendments, Consents, Etc.

          (a)  No amendment or waiver of any provision of this Agreement, the
Notes or the other Basic Documents, nor any consent to any departure by any
Obligor from any provision of this Agreement, the Notes or the other Basic
Documents, shall in any event be effective unless the same shall be in writing
and signed by the Required Lenders, and then such waiver or consent shall be
effective only in the specific instance and for the specific purpose for which
given; provided that:

          (i)  no amendment, waiver or consent shall, unless in writing and
     signed by all the Lenders, do any of the following:

               (1)  waive any of the conditions specified in Section 3.01;

               (2)  change the percentage of the Commitments or of the aggregate
          unpaid principal amount of the Advances, or the number or percentage
          of Lenders, that shall be required for the Lenders or any of them to
          take any action hereunder;


<PAGE>
 
                                    - 132 -


               (3)  amend this Section 9.01;

               (4)  reduce the principal of, or interest on, the Notes or any
          fees or other amounts payable hereunder;

               (5)  postpone any date fixed for any payment of principal of, or
          interest on, the Notes or any fees or other amounts payable hereunder
          or amend Section 2.03 or 2.05;

               (6)  release any Guarantor from its obligations under Article
          VIII; or

               (7)  amend, modify or supplement the Intercreditor Agreement;

          (ii)  no amendment, waiver or consent shall, unless in writing and
     signed by the Required Lenders and each Lender that would be adversely
     affected by such amendment, waiver or consent:

               (1)  increase the Commitment of such Lender or subject such
          Lender to any additional obligations;

               (2)  reduce the principal of, or interest on, the Notes held by
          such Lender or any fees or other amounts payable hereunder to such
          Lender;

               (3)  postpone any date fixed for any payment of principal of, or
          interest on, the Notes held by such Lender or any fees or other
          amounts payable hereunder to such Lender or

               (4)  change the order of application of any prepayment set forth
          in Section 2.05 in any manner that materially affects such Lender; and

          (iii)  no amendment, waiver or consent shall, unless in writing and
     (x) signed by the Administrative Agent in addition to the Lenders required
     above to take such action, affect the rights or duties of the
     Administrative Agent under this Agreement, any Note or any other Basic
     Document, and (y) signed by each Issuing Bank in addition to the Lenders
     required to take such action, amend Section 2.07, 2.13 or 3.02, increase
     the Letter of Credit Sublimit or otherwise affect the rights or obligations
     of any Issuing Bank under this Agreement.

          (b)  Except as otherwise provided in the Security Documents or the
Intercreditor Agreement, the Administrative


<PAGE>
 
                                    - 133 -


Agent shall not consent to release any Collateral or terminate any Lien under
any Security Document unless such release or termination shall be consented to
in writing by Lenders owed or holding in the aggregate at least 75% of the sum
of the then aggregate unpaid principal amount of the Advances, the then
aggregate Unused Commitments and the aggregate Available Amount of all Letters
of Credit (for which purposes the Available Amount of each Letter of Credit
shall be considered to be owed to the relevant Lenders according to their
respective Pro Rata Shares of the Facility under which such Letter of Credit has
been issued); provided that:

          (1)  the consent of all Lenders shall be required to release all or
     substantially all of the Collateral, except upon the termination of the
     Liens created by each of the Security Documents in accordance with the
     terms thereof;

          (2)  no such consent shall be required to release any Lien covering
     property that is the subject of a disposition of property permitted
     hereunder (including, without limitation, dispositions of Receivables
     pursuant to the Permitted Receivables Facilities) and, upon such a
     permitted disposition, such property shall be deemed to be transferred free
     and clear of the Lien of the Security Documents without any action on the
     part of any party (and the Administrative Agent is hereby authorized to
     execute such releases and other documents, and to take such other action,
     as the Company may reasonably request to give effect thereto); and

          (3)  no such consent shall be required to release the Liens under the
     Security Documents covering property of BMLP and its Subsidiaries upon the
     occurrence of the BMLP Restructuring and, upon the BMLP Restructuring, all
     property of BMLP shall be deemed to be released from the Lien of the
     Security Documents without any action on the part of any party (and each of
     the Collateral Agent and the Administrative Agent are hereby authorized to
     execute such releases and other documents, and to take such other action,
     as the Company may reasonably request to give effect thereto).

          Section 9.02.  Notices, Etc.  All notices and other communications
provided for hereunder shall be in writing (including telecopy communication)
and mailed, telecopied or delivered:

          (a)  if to the Borrowers, care of Terra Industries Inc., 600 Fourth
     Street, Sioux City, Iowa 51102, Attention: Francis G. Meyer, Senior Vice
     President and Chief Financial


<PAGE>
 
                                    - 134 -

     Officer, telephone number (712) 279-8790; telecopier number (712) 279-8703;

          (b)  if to any Initial Lender, at its Domestic Lending Office
     specified opposite its name on Schedule 2.01;

          (c)  if to any other Lender, at its Domestic Lending Office specified
     in the Assignment and Acceptance pursuant to which it became a Lender;

          (d)  if to any Issuing Bank, at its address beneath its signature
     hereto;

          (e)  if to the Administrative Agent, at its address at 2 Penns Way,
     Suite 200, New Castle, Delaware, 19720, Attention: Carlos Lopez (or his
     successor), telephone number (302) 894-6007, telecopier number (302) 894-
     6120;

or, as to each party, at such other address as shall be designated by such party
in a written notice to the other parties. All such notices and communications
shall, when mailed or telecopied, be effective when deposited in the mails or
transmitted by telecopier, respectively, except that notices and communications
to the Administrative Agent pursuant to Article II, III or VII shall not be
effective until received by the Administrative Agent.

          Section 9.03.  No Waiver; Remedies.  No failure on the part of any
Lender, any Issuing Bank or the Administrative Agent to exercise, and no delay
in exercising, any right hereunder or under any Note shall operate as a waiver
thereof; nor shall any single or partial exercise of any such right preclude any
other or further exercise thereof or the exercise of any other right. The
remedies herein provided are cumulative and not exclusive of any remedies
provided by law.

          Each Obligor irrevocably waives, to the fullest extent permitted by
applicable law, any claim that any action or proceeding commenced by the
Administrative Agent, any Issuing Bank or any Lender relating in any way to this
Agreement should be dismissed or stayed by reason, or pending the resolution, of
any action or proceeding commenced by any Obligor relating in any way to this
Agreement whether or not commenced earlier. To the fullest extent permitted by
applicable law, the Obligors shall take all measures necessary for any such
action or proceeding commenced by the Administrative Agent, any Issuing Bank or
any Lender to proceed to judgment prior to the entry of judgment in any such
action or proceeding commenced by any Obligor.


<PAGE>
 
                                    - 135 -

          Section 9.04.  Costs, Expenses and Indemnification.
                         ----------------------------------- 
          (a)  Each Borrower agrees to pay on demand (i) all costs and expenses
of the Administrative Agent, the Issuing Banks and the Lenders in connection
with the preparation, execution, delivery, administration, modification and
amendment of the Basic Documents including, without limitation, (A) all due
diligence, syndication (including printing, distribution and bank meetings),
transportation, computer, duplication, appraisal, insurance, consultant, search,
filing and recording fees and expenses, ongoing audit expenses and all other
reasonable out-of-pocket expenses incurred by the Administrative Agent
(including the reasonable and documented fees and expenses of Milbank, Tweed,
Hadley & McCloy, special counsel to Citibank, but not, under this clause (A) or
clause (B) below, of any other counsel) whether or not any of the transactions
contemplated by this Agreement are consummated, (B) the reasonable and
documented fees and expenses of counsel for the Administrative Agent with
respect thereto, with respect to advising the Administrative Agent as to its
rights and responsibilities, or the perfection, protection or preservation of
rights or interests, under the Basic Documents, and (C) with respect to
negotiations with any Obligor or with other creditors of any Obligor or any of
its Subsidiaries arising out of any Default or Event of Default or any events or
circumstances that may reasonably be expected to give rise to a Default or Event
of Default and with respect to presenting claims in or otherwise participating
in or monitoring any bankruptcy, insolvency or other similar proceeding
involving creditors' rights generally and any proceeding ancillary thereto) and
(ii) all costs and expenses of the Administrative Agent, the Issuing Banks and
the Lenders in connection with the enforcement of the Basic Documents, whether
in any action, suit or litigation, any bankruptcy, insolvency or other similar
proceeding affecting creditors' rights generally or otherwise (including,
without limitation, the reasonable and documented fees and expenses of counsel
for the Administrative Agent, each Issuing Bank and each Lender with respect
thereto).

          (b)  Each Borrower agrees to indemnify and hold harmless the
Administrative Agent, each Issuing Bank and each Lender and each of their
Affiliates and their officers, directors, employees, agents and advisors (each,
an "Indemnified Party") from and against any and all claims, damages, losses,
liabilities and expenses (including, without limitation, reasonable fees and
expenses of counsel) that may be incurred by or asserted or awarded against any
Indemnified Party, in each case arising out of or in connection with or by
reason of, or in connection with the preparation for a defense of, any
investigation, litigation or proceeding arising out of, related to or in
connection with the Covered Transactions or the actual
<PAGE>
 
                                    - 136 -

or alleged presence of Hazardous Materials on any property owned by an Obligor
or any Environmental Action relating in any way to any Obligor or any of its
Subsidiaries, in each case whether or not such investigation, litigation or
proceeding is brought by any Obligor, its directors, shareholders or creditors
or an Indemnified Party or any Indemnified Party is otherwise a party thereto
and whether or not the Covered Transactions or the other transactions
contemplated hereby are consummated, except to the extent such claim, damage,
loss, liability or expense is found in a final, non-appealable judgment by a
court of competent jurisdiction to have resulted from such Indemnified Party's
gross negligence or willful misconduct. Each Borrower also agrees not to assert
any claim against the Administrative Agent, any Issuing Bank, any Lender, any of
their Affiliates, or any of their respective directors, officers, employees,
attorneys and agents, on any theory of liability, for special, indirect,
consequential or punitive damages arising out of or otherwise relating to the
Covered Transactions or any part thereof or the other transactions contemplated
herein or in any other Basic Document or the actual or proposed use of the
proceeds of the Advances. For purposes of this Section 9.04(b), the term "non-
appealable" includes any judgment as to which all appeals have been taken or as
to which the time for taking an appeal shall have expired.

          (c)  If any payment of principal of, or Conversion of, any Eurodollar
Rate Advance is made by a Borrower to or for the account of a relevant Lender
other than on the last day of the Interest Period for such Advance, as a result
of a payment or Conversion pursuant to Section 2.03, 2.05, 2.08(b)(i) or 2.09(d)
or as the result of acceleration of the maturity of the Notes pursuant to
Section 6.01 or for any other reason, such Borrower shall, upon demand by such
Lender (with a copy of such demand to the Administrative Agent), pay to the
Administrative Agent for the account of such Lender any amounts required to
compensate such Lender for any additional losses, costs or expenses that it may
reasonably incur as a result of such payment, including, without limitation, any
loss (including loss of anticipated profits), cost or expense incurred by reason
of the liquidation or reemployment of deposits or other funds acquired by any
Lender to fund or maintain such Advance.

          (d)  If any Obligor fails to pay when due any costs, expenses or other
amounts payable by it under any Loan Document, including, without limitation,
reasonable and documented fees and expenses of counsel and indemnities, such
amount may be paid on behalf of such Obligor by the Administrative Agent or any
Lender, in its sole discretion.

          Section 9.05.  Right of Setoff.  Upon (a) the occurrence and during
the continuance of any Event of Default and
<PAGE>
 
                                    - 137 -

(b) the making of the request or the granting of the consent specified by
Section 6.01 to authorize the Administrative Agent to declare the Notes due and
payable pursuant to the provisions of Section 6.01, each Lender is hereby
authorized at any time and from time to time, to the fullest extent permitted by
law, to set off and otherwise apply any and all deposits (general or special,
time or demand, provisional or final) at any time held and other indebtedness at
any time owing by such Lender to or for the credit or the account of each
Borrower against any and all of the Obligations of such Borrower now or
hereafter existing under this Agreement and the Note held by such Lender,
irrespective of whether such Lender shall have made any demand under this
Agreement or such Note and although such obligations may be unmatured. Each
Lender agrees promptly to notify the relevant Borrower after any such setoff and
application; provided that the failure to give such notice shall not affect the
validity of such setoff and application. The rights of each Lender under this
Section are in addition to other rights and remedies (including, without
limitation, other rights of setoff) that such Lender may have.

          Section 9.06. Governing Law; Submission to Jurisdiction. This
Agreement and the Notes shall be governed by, and construed in accordance with,
the law of the State of New York. Each Obligor hereby submits to the
nonexclusive jurisdiction of the United States District Court for the Southern
District of New York and of any New York state court sitting in New York City
for the purposes of all legal proceedings arising out of or relating to this
Agreement or the transactions contemplated hereby. Each Obligor irrevocably
waives, to the fullest extent permitted by applicable law, any objection that it
may now or hereafter have to the laying of the venue of any such proceeding
brought in such a court and any claim that any such proceeding brought in such a
court has been brought in an inconvenient forum.

          Section 9.07.  Assignments and Participations.
                         ------------------------------ 
          (a) Each Lender may assign to one or more banks or other entities all
or a portion of its rights and obligations under this Agreement (including,
without limitation, all or a portion of its Commitments, the Advances owing to
it and the Note or Notes held by it); provided that:

          (i) except in the case of an assignment to a Person that, immediately
     prior to such assignment, was a Lender or an affiliate of a Lender or an
     assignment of all of a Lender's rights and obligations under this
     Agreement, the amount of the Commitments of the assigning Lender being
     assigned pursuant to each such assignment (determined as of
<PAGE>
 
                                    - 138 -

     the date of the Assignment and Acceptance with respect to such assignment)
     shall in no event be less than the lesser of (x) such Lender's Commitments
     hereunder and (y) $5,000,000 or an integral multiple of $1,000,000 in
     excess thereof (except as otherwise agreed by the relevant Borrower and the
     Administrative Agent),

         (ii)  except in the case of an assignment to a Person that, immediately
     prior to such assignment, was a Lender or an affiliate of a Lender, each
     such assignment shall be made only upon the prior written approval of the
     relevant Borrower, the Administrative Agent and each Issuing Bank, such
     approval not to be unreasonably withheld,

         (iii) each such assignment shall be to an Eligible Assignee,

         (iv)  each such assignment by a Lender of its Advances, Commitment or
     Note under any Facility shall be made in such manner so that the same
     portion of its Advances, Commitment and Note under such Facility is
     assigned to the respective assignee,

         (v)   each such assignment by a Lender of its Advances, Commitments and
     Notes shall be made in such a manner so that the same portion of its Terra
     Advances, TNLP Advances, Terra Commitment, TNLP Commitment, Terra Note and
     TNLP Note is assigned to the respective assignee, and

         (vi)  the parties to each such assignment shall execute and deliver to
     the Administrative Agent, for its acceptance and recording in the Register,
     an Assignment and Acceptance, together with any Note or Notes subject to
     such assignment and a processing and recordation fee of $3,000.

Upon such execution, delivery, acceptance and recording, from and after the
effective date specified in such Assignment and Acceptance, (x) the assignee
thereunder shall be a party hereto and, to the extent that rights and
obligations hereunder have been assigned to it pursuant to such Assignment and
Acceptance, have the rights and obligations of a Lender hereunder and (y) the
Lender assignor thereunder shall, to the extent that rights and obligations
hereunder have been assigned by it pursuant to such Assignment and Acceptance,
relinquish its rights and be released from its obligations under this Agreement
(and, in the case of an Assignment and Acceptance covering all or the remaining
portion of an assigning Lender's rights and obligations under this Agreement,
such Lender shall cease to be a party hereto).
<PAGE>
 
                                    - 139 -

          (b)  By executing and delivering an Assignment and Acceptance, the
Lender assignor thereunder and the assignee thereunder confirm to and agree with
each other and the other parties hereto as follows: (i) other than as provided
in such Assignment and Acceptance, such assigning Lender makes no representation
or warranty and assumes no responsibility with respect to any statements,
warranties or representations made in or in connection with this Agreement or
the execution, legality, validity, enforceability, genuineness, sufficiency or
value of this Agreement or any other instrument or document furnished pursuant
hereto; (ii) such assigning Lender makes no representation or warranty and
assumes no responsibility with respect to the financial condition of any Obligor
or the performance or observance by the Obligors of any of their respective
obligations under this Agreement or any other instrument or document furnished
pursuant hereto; (iii) such assignee confirms that it has received a copy of
this Agreement, together with copies of the financial statements referred to in
Section 4.01 and such other documents and information as it has deemed
appropriate to make its own credit analysis and decision to enter into such
Assignment and Acceptance; (iv) such assignee will, independently and without
reliance upon the Administrative Agent, such assigning Lender or any other
Lender and based on such documents and information as it shall deem appropriate
at the time, continue to make its own credit decisions in taking or not taking
action under this Agreement; (v) such assignee confirms that it is an Eligible
Assignee; (vi) such assignee appoints and authorizes the Administrative Agent to
take such action as agent on its behalf and to exercise such powers and
discretion under this Agreement as are delegated to the Administrative Agent by
the terms hereof, together with such powers and discretion as are reasonably
incidental thereto; and (vii) such assignee agrees that it will perform in
accordance with their terms all of the obligations that by the terms of this
Agreement are required to be performed by it as a Lender.

          (c)  The Administrative Agent, acting for this purpose as an agent of
the Borrowers, shall maintain at its address referred to in Section 9.02 a copy
of each Assignment and Acceptance delivered to and accepted by it and a register
for the recordation of the names and addresses of the Lenders and the
Commitments of, and principal amount of the Advances owing under each Facility
to, each Lender from time to time (the "Register"). The entries in the Register
shall be conclusive and binding for all purposes, absent manifest error, and the
Borrowers, the Administrative Agent and the Lenders shall treat each Person
whose name is recorded in the Register as a Lender hereunder for all purposes of
this Agreement. No assignment shall be effective until it is recorded in the
Register pursuant to this Section 9.07(c). The Register shall be available for
inspection
<PAGE>
 
                                    - 140 -

by the Borrowers or any Lender at any reasonable time and from time to time upon
reasonable prior notice.

          (d)  Upon its receipt of an Assignment and Acceptance executed by an
assigning Lender and an assignee, together with any Note or Notes subject to
such assignment, the Administrative Agent shall, if such Assignment and
Acceptance has been completed and is in substantially the form of Exhibit F
hereto, (i) accept such Assignment and Acceptance, (ii) record the information
contained therein in the Register and (iii) give prompt notice thereof to the
Borrowers.  Within five Business Days after its receipt of such notice, the
relevant Borrower, at its own expense, shall execute and deliver to the
Administrative Agent in exchange for the surrendered Note or Notes a new Note or
Notes to the order of such assignee in an amount equal to the portion of the
Facilities assumed by it pursuant to such Assignment and Acceptance and, if the
assigning Lender has retained a portion of such Facilities, a new Note or Notes
to the order of the assigning Lender in an amount equal to the portion so
retained by it hereunder.  Such new Note or Notes shall be in an aggregate
principal amount equal to the aggregate principal amount of such surrendered
Note or Notes, shall be dated the effective date of such Assignment and
Acceptance and shall otherwise be in substantially the form of Exhibit A-1 and
A-2, as the case may be.

          (e)  Each Lender may sell participations in or to all or a portion of
its rights and/or obligations under this Agreement (including, without
limitation, all or a portion of its Commitments or the Advances owing to it and
the Note or Notes held by it); provided that (i) such Lender's obligations under
this Agreement (including, without limitation, its Commitments) shall remain
unchanged, (ii) such Lender shall remain solely responsible to the other parties
hereto for the performance of such obligations, (iii) such Lender shall remain
the holder of any such Note for all purposes of this Agreement, (iv) the
Obligors, the Administrative Agent, the Issuing Banks and the other Lenders
shall continue to deal solely and directly with such Lender in connection with
such Lender's rights and obligations under this Agreement and (v) no participant
under any such participation shall have any right to approve any amendment or
waiver of any provision of any Basic Document, or any consent to any departure
by any Obligor therefrom, except to the extent that such amendment, waiver or
consent would reduce the principal of, or interest on, the Notes or any fees or
other amounts payable hereunder, in each case to the extent subject to such
participation, postpone any date fixed for any payment of principal of, or
interest on, the Notes or any fees or other amounts payable hereunder, in each
case to the extent subject to
<PAGE>
 
                                    - 141 -

such participation, or release all or substantially all of the Collateral.

          (f)  Any Issuing Bank may (subject to the prior written consent of
Terra, such consent not to be unreasonably withheld) assign all or any portion
of its rights and obligations under this Agreement to one or more successor
Issuing Banks that is a commercial bank organized under the laws of the United
States, or any state thereof, and having total assets in excess of
$1,000,000,000 and, upon the acceptance of such assignment, the respective
successor Issuing Banks shall succeed to such portion of such rights and
obligations and such assigning Issuing Bank shall be discharged from its duties
and obligations under this Agreement to such extent, including, without
limitation, such portion of its Letter of Credit Commitment.

          (g)  Any Issuing Bank and any Lender may, in connection with any
assignment or participation or proposed assignment or participation pursuant to
this Section 9.07, disclose to the assignee or participant or proposed assignee
or participant, any information relating to the Borrower furnished to such
Lender by or on behalf of the Borrower; provided that, prior to any such
disclosure, the assignee or participant or proposed assignee or participant
shall agree in writing to preserve the confidentiality of any Confidential
Information received by it from such Issuing Bank or Lender.

          (h)  Notwithstanding any other provision set forth in this Agreement,
any Lender may at any time create a security interest in all or any portion of
its rights under this Agreement (including, without limitation, the Advances
owing to it and the Note or Notes held by it) in favor of any Federal Reserve
Bank in accordance with Regulation A of the Board of Governors of the Federal
Reserve System.

          (i)  Anything in this Section 9.07 to the contrary notwithstanding,
each Lender shall be permitted to pledge all or any part of its right, title and
interest in, to and under the Advances and Notes held by it to any trustee for
the benefit of the holders of such Lender's securities.

          (j)  Anything in this Section 9.07 to the contrary notwithstanding,
neither Terra nor any of its Subsidiaries or Affiliates may acquire (whether by
assignment, participation or otherwise), and no Lender or Issuing Bank shall
assign or participate to Terra or any of its Subsidiaries or Affiliates, any
interest in any Commitment, Advance or other amount owing hereunder without the
prior consent of each Lender; provided that the Lenders and the Issuing Banks
may assign all of their
<PAGE>
 
                                    - 142 -

interests in the Commitments, Advances and such other amounts pursuant to the
Loan Purchase Agreement.

          Section 9.08. Execution in Counterparts. This Agreement may be
executed in any number of counterparts and by different parties hereto in
separate counterparts, each of which when so executed shall be deemed to be an
original and all of which taken together shall constitute one and the same
agreement. Delivery of an executed counterpart of a signature page to this
Agreement by telecopier shall be effective as delivery of a manually executed
counterpart of this Agreement.

          Section 9.09. No Liability of the Issuing Banks. Each Borrower assumes
all risks of the acts or omissions of any beneficiary or transferee of any
Letter of Credit with respect to its use of such Letter of Credit. Neither the
relevant Issuing Bank nor any of its officers or directors shall be liable or
responsible for: (a) the use that may be made of any Letter of Credit or any
acts or omissions of any beneficiary or transferee in connection therewith; (b)
the validity, sufficiency or genuineness of documents, or of any endorsement
thereon, even if such documents should prove to be in any or all respects
invalid, insufficient, fraudulent or forged; (c) payment by such Issuing Bank
against presentation of documents that do not comply with the terms of a Letter
of Credit, including failure of any documents to bear any reference or adequate
reference to the Letter of Credit; or (d) any other circumstances whatsoever in
making or failing to make payment under any Letter of Credit, except that the
relevant Borrower shall have a claim against such Issuing Bank, and such Issuing
Bank shall be liable to such Borrower, to the extent of any direct, but not
consequential, damages suffered by such Borrower that such Borrower proves were
caused by (i) such Issuing Bank's willful misconduct or gross negligence in
determining whether documents presented under any Letter of Credit comply with
the terms of the Letter of Credit or (ii) such Issuing Bank's willful failure to
make lawful payment under a Letter of Credit after the presentation to it of a
draft and certificates strictly complying with the terms and conditions of the
Letter of Credit. In furtherance and not in limitation of the foregoing, such
Issuing Bank may accept documents that appear on their face to be in order,
without responsibility for further investigation, regardless of any notice or
information to the contrary.

          Section 9.10. Confidentiality. Neither the Administrative Agent, any
Issuing Bank nor any Lender shall disclose any Confidential Information to any
Person without the prior consent of the Company, other than (a) to the
Administrative Agent's, such Issuing Bank's or such Lender's Affiliates and
their officers, directors, employees, agents and
<PAGE>
 
                                    - 143 -

advisors (including independent auditors and counsel) and to actual or
prospective assignees and participants, and then only on a confidential basis,
(b) as required by any law, rule or regulation or judicial process, (c) as
requested or required by any state, federal or foreign authority or examiner
regulating or having authority over Lenders or the Lenders' respective
activities and (d) in connection with credit inquiries from suppliers of the
Borrowers and/or their Subsidiaries and other Persons who, from time to time,
inquire as to the creditworthiness of the Borrowers.

          Section 9.11. WAIVER OF JURY TRIAL. EACH OF THE OBLIGORS, THE
ADMINISTRATIVE AGENT, THE LENDERS AND THE ISSUING BANKS HEREBY IRREVOCABLY
WAIVES ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM
(WHETHER BASED ON CONTRACT, TORT OR OTHERWISE) ARISING OUT OF OR RELATING TO ANY
OF THE BASIC DOCUMENTS, THE ADVANCES, THE LETTERS OF CREDIT OR THE ACTIONS OF
THE ADMINISTRATIVE AGENT, ANY LENDER OR ANY ISSUING BANK IN THE NEGOTIATION,
ADMINISTRATION, PERFORMANCE OR ENFORCEMENT THEREOF.

          Section 9.12. Survival. The obligations of the Borrowers under
Sections 2.09, 2.11 and 9.04, the obligations of each Guarantor under Section
8.03, and the obligations of the Lenders under Section 7.05, shall survive the
repayment of the Advances and the termination of the Commitments. In addition,
each representation and warranty made, or deemed to be made by a notice of any
extension of credit (whether by means of an Advance or a Letter of Credit),
herein or pursuant hereto shall survive the making of such representation and
warranty, and no Lender or Issuing Bank shall be deemed to have waived, by
reason of making any extension of credit hereunder (whether by means of an
Advance or a Letter of Credit), any Default or Event of Default that may arise
by reason of such representation or warranty proving to have been false or
misleading, notwithstanding that such Lender, such Issuing Bank or the
Administrative Agent may have had notice or knowledge or reason to believe that
such representation or warranty was false or misleading at the time such
extension of credit was made.

          Section 9.13. Captions. The table of contents and captions and section
headings appearing herein are included solely for convenience of reference and
are not intended to affect the interpretation of any provision of this
Agreement.

          Section 9.14. Successors and Assigns. This Agreement shall be binding
upon and inure to the benefit of the parties hereto and their respective
successors and permitted assigns, provided that no Obligor may assign any of its
rights or obligations hereunder or under the other Basic Documents without
<PAGE>
 
                                    - 144 -

the prior consent of all of the Lenders, the Issuing Banks and the
Administrative Agent.

          Section 9.15. NationsBank Assignments. By its signature below,
NationsBank, N.A. hereby acknowledges and agrees that it has, as of the date
hereof (but prior to the amendment and restatement provided for hereby),
acquired all of the "Advances" and "Commitments" of Boatman's National Bank and
NationsBank of Texas, N.A. outstanding under the Existing Credit Agreement. By
their signatures below, the Company and the Administrative Agent hereby
acknowledge their consent to such assignment.
<PAGE>
 
                                    - 145 -

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be executed by their respective officers thereunto duly authorized, as of the
date first above written.

                                   THE BORROWERS
                                   -------------

                                   TERRA CAPITAL, INC.


                                   By /s/Francis G. Meyer
                                     ---------------------------------
                                     Title: Vice President

                                   TERRA NITROGEN, LIMITED PARTNERSHIP

                                     By Terra Nitrogen Corporation, its General
                                        Partner


                                        By /s/Francis G. Meyer
                                          -----------------------------
                                          Title: Vice President

                                   GUARANTORS
                                   ----------

                                   TERRA INDUSTRIES INC.


                                   By /s/Francis G. Meyer
                                     ----------------------------------
                                     Title: Senior Vice President

                                   TERRA CAPITAL HOLDINGS, INC.


                                   By /s/Francis G. Meyer
                                     ----------------------------------
                                     Title: Vice President

                                   TERRA NITROGEN CORPORATION


                                   By /s/Francis G. Meyer
                                     ----------------------------------
                                     Title: Vice President
<PAGE>
 
                                    - 146 -

                              TERRA METHANOL CORPORATION

                              By /s/Francis G. Meyer
                                ----------------------------------             
                                Title: Vice President

                              
                              BMC HOLDINGS, INC.

                              By /s/Francis G. Meyer
                                ----------------------------------             
                                Title: Vice President
 

                              TERRA INTERNATIONAL INC.

                              By /s/Francis G. Meyer
                                ----------------------------------             
                                Title: Senior Vice President
                              

                              THE ADMINISTRATIVE AGENT
                              ------------------------


                              CITIBANK, N.A.

                              By /s/James Simpson
                                 ---------------------------------             
                                 Title: Managing Director


                              THE ISSUING BANKS
                              -----------------

                              CITIBANK, N.A.

                              By /s/James Simpson
                                ----------------------------------             
                                Title: Managing Director
<PAGE>
 
                                    - 147 -


                              THE LENDERS
                              -----------


                              CITIBANK, N.A.

                              By /s/James Simpson
                                ----------------------------------             
                                Title:  Attorney-in-Fact


                              BANK OF AMERICA NATIONAL TRUST AND
                                SAVINGS ASSOCIATION
 
                              By /s/Margaret H. Claggett
                                -----------------------------------             
                                Title: Vice President


                              THE BANK OF NOVA SCOTIA

                              By /s/F.C.H. Ashby
                                -----------------------------------             
                                Title: Senior Manager Loan Operations


                              THE CHASE MANHATTAN BANK

                              By /s/Michael D. Peist
                                -----------------------------------             
                                Title: Vice President


                              ARAB BANKING CORPORATION
 
                              By /s/Sheldon Tilney
                                -----------------------------------             
                                Title: Deputy General Manager
<PAGE>
 
                                    - 148 -


                              CREDIT AGRICOLE INDOSUEZ

                              By /s/W. Leroy Startz
                                -----------------------------------             
                                Title: First Vice President
                             

                              By /s/David Bouhl
                                ----------------------------------             
                                Title: First Vice President,
                                

                              Head of Corporate Banking
                              Chicago

                              COOPERATIEVE CENTRALE RAIFFEISEN-
                                BOERENLEENBANK, B.A.,
                                "RABOBANK NEDERLAND", NEW YORK
                                BRANCH

                              By /s/Dana W. Hemenway
                                ----------------------------------             
                                Title: Vice President
 

                              By /s/W. Pieter C. Kodde
                                ----------------------------------             
                                Title: Vice President


                              CREDIT LYONNAIS CHICAGO BRANCH

                              By /s/Julie T. Kanak
                                ----------------------------------             
                                Title: Vice President


                              DRESDNER BANK AG, NEW YORK AND
                                GRAND CAYMAN BRANCHES

                              By /s/Michiel V.M. van der Voort
                                ----------------------------------             
                                Title: Vice President


                              By /s/ Richard G. Reilly
                                ----------------------------------
                                Title: Vice President
                                
<PAGE>
 
                                    - 149 -


                              FIRST BANK NATIONAL ASSOCIATION

                              By /s/ Michael S. Harter
                                -----------------------------------             
                                Title: Assistant Vice President


                              THE FUJI BANK, LIMITED

                              By /s/ Peter L. Chinnici
                                ----------------------------------             
                                Title: Joint General Manager


                              NATIONSBANK, N.A.

                              By /s/ Barry P. Sullivan
                                ----------------------------------             
                                Title: Vice President


                              UNION BANK OF SWITZERLAND, NEW YORK
                                BRANCH

                              By /s/ Mary V. Turnbach
                                ----------------------------------             
                                Title: Assistant Treasurer
 
                              By /s/ Paula Mueller
                                ----------------------------------             
                                Title: Vice President Structured
                                        Finance


                              BANQUE NATIONALE DE PARIS

                              By /s/ William J. Krummen
                                ----------------------------------             
                                Title: Vice President and Manager
<PAGE>
 
                                    - 150 -


                              RETIRING LENDERS
                              ----------------

                              MELLON BANK, N.A.

                              By /s/ Charles A. Gilbert
                                ----------------------------------             
                                Title: Banking Officer

<PAGE>

                                                                      EXHIBIT 99

                                                                  CONFORMED COPY
                                                                  --------------

                           DATED 31ST DECEMBER, 1997


                       TERRA INTERNATIONAL (CANADA) INC.

                                      and

                        ICI CHEMICALS & POLYMERS LIMITED


                -----------------------------------------------
                       AMMONIUM NITRATE HEDGING AGREEMENT
                -----------------------------------------------


                                 ALLEN & OVERY
                                     London
                                        
<PAGE>
 
THIS AGREEMENT is made on 31st December, 1997 BETWEEN:

(1)  TERRA INTERNATIONAL (CANADA) INC., 252 Pall Mall Street, Suite 200 London,
     Ontario, Canada N6A 5P6 an Ontario corporation ("Terra"); and

(2)  ICI CHEMICALS & POLYMERS LIMITED, (registered number 358535) a company
     incorporated under the laws of England (the "Counterparty").

WHEREAS:

(A)  An affiliate of Terra has acquired  from the Counterparty a business (the
     "Business") engaged in the manufacture of ammonium nitrate in the United
     Kingdom pursuant to a Sale of Business Agreement dated 20th November 1997.

(B)  The revenues of the Business from sales of ammonium nitrate during the
     calendar years ending 31st December, 1998, 1999, 2000, 2001, 2002 and, if
     clause 3 applies, 2003 (each year is referred to as a "Rights Period") are
     expected to vary depending on the market price of ammonium nitrate at the
     time of sale, with such revenues increasing if prices increase and
     declining if prices decline.

(C)  Terra and its affiliates are desirous of reducing their risk with respect
     to future changes in the market prices of ammonium nitrate with respect to
     the Business by receiving a fixed cash payment from the Counterparty in
     exchange for undertaking an obligation to make future payments to the
     Counterparty in the event that a portion of the ammonium nitrate produced
     by the Business is sold for more than a specified amount during the Rights
     Periods.

(D)  Terra Industries Inc., the ultimate parent company of Terra, has agreed to
     guarantee the obligations of Terra, and certain other subsidiaries, in
     connection with the acquisition of the Business.

NOW THEREFORE, in consideration of the mutual covenants contained herein, the
parties hereby agree as follows:

1.   PURCHASE OF RIGHTS

     The Counterparty will pay to Terra on each of the first three Payment Days
     (as such term is defined in clause 2(a) below) the sum of (Pounds) 2.7
     million; provided, however, that if any amount is payable on such Payment
     Day from Terra to the Counterparty under clause 2(a) below, the
     Counterparty may instead instruct Terra to deduct the amount which would
     otherwise be due under this clause from the amount Terra is required to pay
     under clause 2(a) below.

2.   GRANTS OF RIGHTS

     (a)  Terra will pay to the Counterparty, within 30 days after the end of
          each Rights Period (such day being referred to as a "Payment Day"),
          the amount, if any, computed to be due for such Rights Period in
          accordance with this paragraph.

          For each Rights Period, the amount, if any, payable hereunder by Terra
          to the Counterparty shall be an amount in pounds sterling equal to the
          product of 500,000 times:
<PAGE>
 
                                       2

          (i)   the average delivered selling price (taking account of all
                rebates and discounts) per metric tonne of all bagged ammonium
                nitrate fertiliser (the "Product") sold in the UK by the then
                owner of the Business during such Rights Period, minus

          (ii)  (pounds)100.

          Notwithstanding the foregoing, the total amount payable hereunder
          shall, subject to clause 3 below, not exceed (pounds)58.1 million in
          the aggregate for all Rights Periods.

     (b)  If Terra so elects by written notice of not less than 14 days to the
          Counterparty and provided Terra Industries Inc. is not insolvent,
          Terra may, in lieu of making any portion or all of the foregoing
          payment for any Rights Period, deliver to the Counterparty at such
          address as the Counterparty nominates for the purpose in the UK, up to
          500,000 tonnes of Product for such Rights Period against payment by
          the Counterparty to Terra in cash of (pounds)100 per tonne so
          delivered. For each tonne so delivered, the number 500,000 used in
          clause 2(a) will be reduced by one.

3.   UNRECOMPENSED FORCE MAJEURE

     (a)  If the Counterparty would be entitled to be paid an amount in excess
          of the Capped Amount (as defined below) in any Rights Period but an
          Unrecompensed Force Majeure Event (as defined below) has occurred then
          Terra shall be entitled to serve a Hardship Notice upon the
          Counterparty in accordance with sub-clause (b) below.

     (b)  A Hardship Notice shall comprise a certificate by an officer of Terra,
          countersigned by an officer of Terra Industries Inc., confirming that
          the circumstances in sub-clause (a) have occurred supported by a
          certificate from Terra's insurers to the effect that the insurance
          cover is not available in respect of the Unrecompensed Force Majeure
          Event (in the terms described in the definition "Unrecompensed Force
          Majeure Event" below).

     (c)  If a Hardship Notice is validly served it shall have the following
          effect:

          (i)    the maximum payment for the Rights Period in question shall be
                 the Capped Amount;

          (ii)   the maximum amount payable under this agreement shall be
                 increased from (pounds)58.1 million to (pounds)61.1 million;
                 and

          (iii)  the period in respect of which payments may be due hereunder
                 shall be extended by one additional calendar year.

     (d)  In this Agreement "Unrecompensed Force Majeure Event" means any event
          beyond the reasonable control of the (then) owner of the Business
          which materially affects the operation of the Business and subsists
          for a continuous period of 60 days or more and for which by reason of
          the nature of the incident(s) the then owner is not able to be
          recompensed under the business interruption insurance in force in
          respect of the Business for the Rights Period in question.

     (e)  In this Agreement the "Capped Amount" means (pounds)12.7 million in
          any of the years ending 31 December, 1998, 1999 or 2000 and (pounds)10
          million in any of the subsequent years.
<PAGE>
 
                                       3

4.   SALE

     (a)  This Agreement shall apply irrespective of which member or members of
          the group of companies of which Terra Industries Inc. is the ultimate
          parent company is the owner of the Business.

     (b)  This Agreement shall not prevent Terra selling or otherwise disposing
          of the Business or its interest therein but such sale or disposal
          shall not relieve Terra (or Terra Industries Inc. under its guarantee)
          of the obligations to make payments under this Agreement and
          references to sales of Product shall be deemed to include sales by any
          successor.  Terra shall be obliged to ensure that all rights of the
          Counterparty under this Agreement, including rights of verification,
          are not prejudiced by any such sale or disposal.

5.   VERIFICATION RIGHTS

     (a)  On each Payment Day, Terra shall provide to the Counterparty a
          certificate signed by  an officer, certifying the calculations made
          and date used for such calculations to be used in determining the
          amount, if any, due on such Payment Day.

     (b)  Terra shall keep complete, true and accurate books of account and
          records for the purpose of showing the correctness of the above
          calculations and such certificate.  Those books and records shall be
          made available during normal working hours for inspection by an
          independent chartered  public accountant selected by the Counterparty
          (the "Accountant"), to whom Terra has no reasonable objection, for the
          purpose of verifying the correctness of the applicable certificate.

     (c)  The Accountant shall be obliged to treat such books and records as
          confidential: provided, however, that the Accountant may disclose to
          the Counterparty whether the applicable certificate is correct and, if
          it is not, how it is not.

     (d)  The Counterparty shall pay the costs of such inspection unless the
          Accountant determines that the calculation is incorrect in which case
          the costs shall be borne as the Accountant shall determine having
          regard to the degree by which the calculation is incorrect.

     (e)  The determination of the Accountant shall be final and binding on the
          parties.

6.   GOVERNING LAWS

     This Agreement shall be governed by, and construed and interpreted in
     accordance with the laws of England (excluding principles of conflicts of
     laws).

7.   INDEPENDENT ACCOUNTANT

(a)  If the parties disagree on the application of clause 3 (Unrecompensed Force
     Majeure) either party may give notice to the other requiring the
     appointment of an independent accounting firm of international reputation
     (the "Independent Accountant").  If the parties are unable to agree upon
     the Independent Accountant within 14 days of such notice, then the
     Independent Accountant shall be appointed by the President for the time
     being of the Institute of Chartered Accountants in England and Wales on the
     application of either party.
<PAGE>
 
                                       4

(b)  If the Independent Accountant delays or becomes unwilling or incapable of
     acting or if for any other reason the President for the time being of the
     Institute of Chartered Accountants in England and Wales thinks fit he may
     discharge the Independent Accountant and, in the absence of agreement
     between the parties, appoint another in his place.

(c)  The Independent Accountant shall act as an expert and not as an arbitrator
     and his decision shall (in the absence of manifest error or material
     departure from instructions) be final and binding on the parties.  The
     Independent Accountant shall afford the parties the opportunity of making
     written representations to him.

(d)  The fees and expenses of the Independent Accountant shall be borne by the
     parties in equal shares unless the Independent Accountant otherwise
     determines.

8.   Notices

     Any notice, request, instruction, correspondence or other document to be
     given hereunder by either party to the other shall be in writing and shall
     be delivered in person or by confirmed facsimile transmission as follows:

     Terra:

     c/o Terra Industries, Inc.
     600 Fourth Street
     Terra Centre
     Sioux City, Iowa 51101
     Facsimile: 001 712 279 8703
     Attention: George H. Valentine, Esq.

     Counterparty:

     ICI Chemicals & Polymers Limited
     The Heath
     Runcorn
     Cheshire
     WA7 4QF
     Facsimile: 00 44 1928 515 555
     Attention: The Company Secretary

     Notice given by personal delivery shall be effective upon actual receipt.
     Notices given by facsimile transmission shall be effective at 5.00 p.m.,
     local time, at the place of receipt on the next business day after
     transmission of confirmation of receipt by the sending party.  Either party
     may change any address to which notices are required to be given by giving
     notice thereof as provided above.

9.   Miscellaneous

     (a)  The section headings contained in this Agreement are for the
          convenience of the parties only and shall not be interpreted as part
          of this Agreement.
<PAGE>
 
                                       5

     (b)  Waiver by one party of the other party's breach of any provision of
          this Agreement shall not be deemed a waiver of any subsequent or
          continuing breach of such provision or of the breach of any other
          provision or provisions hereof.

     (c)  Any provision of this Agreement which is prohibited or unenforceable
          in any jurisdiction shall, as to such jurisdiction, be ineffective to
          the extent of such prohibition or unenforceability without
          invalidating the remaining provisions hereof, and any such prohibition
          or unenforceability in any jurisdiction shall not invalidate or render
          unenforceable such provision in any other jurisdiction.

     (d)  All amounts of money referred to in this Agreement shall be construed
          to mean money which at the time is lawful of money to the United
          Kingdom.

     (e)  Each party hereto represents and warrants that this Agreement has been
          duly authorized, executed and delivered and constitutes a legal, valid
          and binding agreement enforceable against it in accordance with its
          terms.

     (f)  Terra hereby waives and relinquishes any right of set-off or
          counterclaim deduction or retention which Terra might otherwise have
          in relation to any payment under this Agreement.

     (g)  This Agreement shall not be modified except by written instrument
          executed by duly authorized representatives of the parties.

     (h)  This Agreement may be executed in any number of counterparts, all of
          which taken together shall constitute one and the same Agreement and
          any party may enter into this Agreement by executing a counterpart.

IN WITNESS WHEREOF the parties have caused this Agreement to be executed by
their duly authorized representatives as of the date first written above.

TERRA INTERNATIONAL (CANADA) INC.

By:     G.H. VALENTINE
Name:   G.H. VALENTINE
Title:  VICE PRESIDENT

ICI CHEMICALS & POLYMERS LIMITED

By:     J.K. REYNOLDS
Name:   J.K. REYNOLDS
Title:  BUSINESS MANAGER


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