UNITED STATES FILTER CORP
8-K, 1995-04-14
REFRIGERATION & SERVICE INDUSTRY MACHINERY
Previous: CITICASTERS INC, DEF 14A, 1995-04-14
Next: TRACINDA CORP, SC 13D/A, 1995-04-14



<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C.  20549

                                   Form 8-K

                                CURRENT REPORT



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


Date of Report (Date of earliest event reported)    April 3, 1995
                                                  ---------------



                       United States Filter Corporation
                       --------------------------------
            (Exact name of registrant as specified in its charter)

<TABLE>
<CAPTION>
 
 
<S>                             <C>            <C>
        Delaware                  1-10728         33-0266015
- - ---------------------------     -----------    ------------------
(State of other juris-          (Commission    (IRS Employer
 diction of incorporation       File Number)   Identification No.)
 
</TABLE>

73-710 Fred Waring Drive, Suite 222, Palm Desert, California 92260
- - ------------------------------------------------------------------
       (Address of principal executive offices)      (zip code)


Registrant's telephone number, including area code  (619) 340-0098
                                                   ---------------
<PAGE>
 
Item 2.  Acquisition of Assets


       On April 3, 1995, United States Filter Corporation (the "Company")
acquired all of the outstanding capital stock of the Permutit Company Limited,
an English corporation ("Permutit UK") and The Permutit Company Pty Ltd., an
Australian corporation ("Permutit Australia"). Permutit Australia has one
subsidiary, Permutit New Zealand Limited. The Company acquired Permutit UK and
Permutit Australia through the Company's English subsidiary, Ionpure
Technologies Limited (the "Purchaser") pursuant to a Share Purchase Agreement
dated April 3, 1995 (the "Purchase Agreement") among the Purchaser, the Company,
Thames Water Products & Services Limited ("TWPS") and PWT Overseas Limited
("PWT"), both English corporations and the owners of, respectively, the capital
stock of Permutit UK and Permutit Australia, and Thames Water PLC ("Sellers
Guarantor"), an English corporation. TWPS and PWT (together the "Sellers") are
indirect subsidiaries of Sellers Guarantor. Permutit UK, Permutit Australia and
Permutit New Zealand Limited are referred to as the "Permutit Group". The
transaction will be accounted for as a purchase, effective April 3, 1995.

       The cash consideration for the acquisition (the "Acquisition") of
Permutit UK and Permutit Australia under the Purchase Agreement is
(Pounds)6,268,037, which amount was paid on April 3, 1995, the closing date.
Also on the closing date, Permutit UK assigned to the Purchaser a note for
(Pounds)2,785,345 owed by TWPS to Permutit UK and that note was then discharged
as part of the consideration for the Acquisition.  Of this aggregate
consideration of (Pounds)9,053,382, the Purchase Agreement provides that
(Pounds)7,799,775 was apportioned to the purchase of Permutit UK and
(Pounds)1,253,607 was apportioned to the purchase of Permutit Australia.

       The amount paid by the Purchaser for Permutit UK and Permutit Australia
is subject to reduction if the "Net Asset Value" (as defined) of the Permutit
Group at March 31, 1995 is less than (Pounds)3,125,000 (the "Base Net Asset
Value"). The Net Asset Value at March 31, 1995 is to be determined within 90
days of April 3, 1995 by Seller's accountants by the delivery by such
accountants of financial statements for the Permutit Group as of March 31, 1995
(the "Completion Accounts") and, if such Net Asset Value is less than the Base
Net Asset Value, the amount of such difference is to be paid to Purchaser within
seven days of the agreement of the Sellers and the Purchaser on the Completion
Accounts or the determination of an independent chartered accountant in the
event of a dispute. The Base Net Asset Value is subject to adjustment, upward or
downward, in the event of a change in the difference between the Permutit
Group's actual margins and forecasted margins, determined by comparing the
actual and forecasted margins at March 31, 1995 as set forth in the Purchase
Agreement, with the actual and forecasted margins determined pursuant to the
Completion Accounts.

                                      -1-
<PAGE>
 
       Under the Purchase Agreement, the parties thereto provided various
  representations, including with respect to the Sellers, representations as to
  the Permutit Group and their respective properties, and provided certain
  indemnities for the breach of any obligation or representations, all as set
  forth in the Purchase Agreement, and subject to the limitations provided for
  therein.

       The Purchase Agreement also provides that, for a period of two years,
  neither the Sellers, nor their subsidiaries, will be engaged or interested in
  any business which directly competes with the "Business of the Group" (as
  defined), provided, that certain "Permitted Businesses" (as defined) may
  continue to be carried on as at the closing date and under license agreements
  entered into upon closing between Permutit UK and subsidiaries of the Sellers
  guarantor, the "Permutit Brand Name" (as defined) may be used in Egypt and
  South Africa by the Sellers' subsidiaries operating in those countries.

       The obligations of the Sellers under the Agreement have been guaranteed
  by the Seller's Guarantor.

       Through its ten offices, The Permutit Group has a strong position in the
  United Kingdom, Australian and New Zealand markets in ion exchange and
  membrane technology.  The Permutit Group also offers a range of products,
  including pre-engineered water treatment systems for the pharmaceutical,
  laboratory and chemical markets and other commercial customers.  The Permutit
  Group believes it has the largest market share in its Australian and New
  Zealand markets.  The Company believes that The Permutit Group's comprehensive
  service and SDI network will complement the Company's already strong presence
  in Western Europe.  The Acquisition will further implement the Company's
  strategy of offering a broad range of products and services in its market
  areas, and will also expand the Company's operations into Australia and New
  Zealand and will enhance its presence in the Far East.


  Item 7.  Financial Statements, Pro Forma Financial Information and Exhibits.

       (a)  Financial statements of business acquired:
                    Report of Coopers & Lybrand;
                    Profit and Loss Account;
                    Balance Sheets as of March 31, 1994 and 1993;
                    Notes to Financial Statements.

     (b)    Pro Forma Financial Information:
                   Pro Forma combined balance sheet, statements of operation and
                   notes thereto.

                                      -2-
<PAGE>
 
                (c) Exhibits

                  2.0  Share Purchase Agreement dated April 3, 1995 among Thames
                       Water Products & Services Limited, PWT Overseas Limited,
                       Ionpure Technologies Limited, Thames Water PLC and United
                       States Filter Corporation, including only Schedules 1, 2
                       and 3.



     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 hereunto duly authorized.


                              UNITED STATES FILTER CORPORATION



                              By:   /s/ Donald L. Bergmann
                                    ---------------------------
                                    Donald L. Bergmann
                                    Vice President


  Date:   April   , 1995

                                      -3-
<PAGE>
 
                          THE PERMUTIT COMPANY LIMITED
 
                (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors of The Permutit Company Limited
 
  We have audited the accompanying balance sheets of The Permutit Company
Limited (a wholly owned subsidiary of Thames Water PLC) at 31 March 1994 and
1993, and the related profit and loss accounts and statements of cashflows for
the years then ended set out on pages F-2 to F-13. These financial statements
are the responsibility of management. Our responsibility is to express an
opinion on those financial statements.
 
  We conducted our audits in accordance with generally accepted auditing
standards in the United Kingdom which are substantially the same as auditing
standards generally accepted in the United States. Those standards require that
we plan and perform the audit to obtain reasonable assurance about whether the
financial statements are free of material misstatement. An audit includes
examining, on a test basis, evidence supporting the amounts and disclosures in
the financial statements. An audit also includes assessing the accounting
principles used and significant estimates made by management, as well as
evaluating the overall financial statement presentation. We believe our audits
provide a reasonable basis for our opinion.
 
  In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of The Permutit Company Limited
at 31 March 1994 and 1993 and the results of its operations and its cashflows
for the years then ended in conformity with generally accepted accounting
principles in the United Kingdom.
 
  The financial statements were prepared in accordance with the accounting
policies set out in note 1 and comply with generally accepted accounting
principles in the United Kingdom which differ in certain respects from United
States generally accepted accounting principles as set out in note 29.
 
/s/ Coopers & Lybrand
- - ---------------------
Coopers & Lybrand
 
Independent Accountants and Registered Auditors
Uxbridge
West London
United
Kingdom
   
16 June 1994,
except for note
30, as to which
the date is 3
April 1995     
 
                                      F-1
<PAGE>
 
                          THE PERMUTIT COMPANY LIMITED
 
                (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)
 
                            PROFIT AND LOSS ACCOUNT
 
<TABLE>   
<CAPTION>
                                                         YEAR ENDED  YEAR ENDED
                                                          31 MARCH    31 MARCH
                                                    NOTE    1994        1993
                                                    ---- ----------  ----------
                                                          (Pounds)    (Pounds)
<S>                                                 <C>  <C>         <C>
Turnover...........................................   2   8,195,824  10,439,674
Cost of sales......................................      (5,199,271) (6,703,198)
                                                         ----------  ----------
Gross profit.......................................       2,996,553   3,736,476
Marketing, selling and distribution expenses.......      (2,829,780) (2,847,449)
Administration expenses............................      (1,309,684) (1,292,505)
                                                         ----------  ----------
Loss on ordinary activities before interest........      (1,142,911)   (403,478)
Interest receivable................................   3         212       9,711
Interest payable...................................   4     (61,599)    (21,096)
                                                         ----------  ----------
Loss on ordinary activities before taxation........   5  (1,204,298)   (414,863)
Tax on ordinary activities.........................   8     238,108      77,311
                                                         ----------  ----------
Loss on ordinary activities after taxation.........        (966,190)   (337,552)
Dividends paid.....................................             --     (657,843)
                                                         ----------  ----------
Loss retained for the financial year...............  18    (966,190)   (995,395)
                                                         ==========  ==========
</TABLE>    
 
  The above results all arise from continuing activities.
 
  The company has no recognised gains and losses other than those included in
the results above, and therefore no separate statement of total recognised
gains and losses has been presented.
 
  There is no difference between the loss on ordinary activities before
taxation and the retained loss for the year stated above, and their historical
cost equivalents.
 
          The notes on pages F-5 to F-13 form part of these accounts.
 
                                      F-2
<PAGE>
 
                          THE PERMUTIT COMPANY LIMITED
 
                (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)
                                 
                              BALANCE SHEETS     
 
<TABLE>   
<CAPTION>
                                                          31 MARCH    31 MARCH
                                                    NOTE    1994        1993
                                                    ---- ----------  ----------
                                                          (Pounds)    (Pounds)
<S>                                                 <C>  <C>         <C>
Fixed assets
  Intangible assets................................   9     185,511     190,936
  Tangible assets..................................  10     714,241     904,430
  Investments......................................  11           6           6
                                                         ----------  ----------
                                                            899,758   1,095,372
                                                         ----------  ----------
Current assets
  Stocks...........................................  12     956,859   1,084,272
  Debtors..........................................  13   5,673,473   6,646,263
  Cash at bank and in hand.........................             --       64,864
                                                         ----------  ----------
                                                          6,630,332   7,795,399
Creditors
  Amounts falling due within 1 year................  14  (2,488,038) (2,969,073)
                                                         ----------  ----------
Net current assets.................................       4,142,294   4,826,326
                                                         ----------  ----------
Total assets less current liabilities..............       5,042,052   5,921,698
Creditors
  Amounts falling due after more than 1 year.......  15          (5)         (5)
Provisions for liabilities and charges.............  16    (175,052)    (88,508)
                                                         ----------  ----------
Net assets.........................................       4,866,995   5,833,185
                                                         ==========  ==========
Capital & reserves
  Called up share capital..........................  17   5,800,000   5,800,000
  Profit and loss account..........................        (933,005)     33,185
                                                         ----------  ----------
                                                          4,866,995   5,833,185
                                                         ==========  ==========
</TABLE>    
 
          The notes on pages F-5 to F-13 form part of these accounts.
 
                                      F-3
<PAGE>
 
                          THE PERMUTIT COMPANY LIMITED
                (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)
 
                            STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                             YEAR ENDED 31
                                                                 MARCH
                                                           --------------------
                                                      NOTE   1994        1993
                                                      ---- ---------   --------
                                                           (Pounds)    (Pounds)
<S>                                                   <C>  <C>         <C>
Net cash inflow/(outflow) from operating activities.   27   (578,664)    17,909
RETURNS ON INVESTMENTS AND SERVICING OF FINANCE
  Interest received.................................             212      9,711
  Interest paid.....................................         (61,599)   (21,096)
  Dividends paid....................................             --    (657,843)
                                                           ---------   --------
Net cash outflow from returns in investments and
 servicing of finance...............................        (640,051)  (651,319)
TAXATION
Group tax relief received...........................          92,000    201,157
INVESTING ACTIVITIES
Purchase of tangible fixed assets...................        (129,753)  (364,650)
Sale of tangible fixed assets.......................          59,426     35,354
                                                           ---------   --------
Net cashflow from investing activities..............         (70,327)  (329,296)
                                                           ---------   --------
Net cash inflow (outflow) before financing..........        (618,378)  (779,458)
                                                           ---------   --------
Increase/(decrease) in cash and cash equivalents....   28   (618,378)  (779,458)
                                                           =========   ========
</TABLE>
          
       The notes on pages F-5 to F-13 form part of these accounts.     
 
                                      F-4
<PAGE>
 
                          THE PERMUTIT COMPANY LIMITED
 
                (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)
 
                             NOTES TO THE ACCOUNTS
 
1. ACCOUNTING POLICIES
 
 a) Accounting Convention
 
  The accounts have been prepared in accordance with the historical cost
convention rules and applicable accounting standards. The company is a wholly
owned subsidiary undertaking of Thames Water Plc.
 
  The parent has committed to continue its support of the operations of the
Company for the next twelve months. Accordingly, the financial statements may
not be indicative of the conditions that would have existed or the results of
operations that would have been obtained had the Company operated on a stand
alone basis.
 
  The Company receives certain managerial, financial, technical and other
support from its parent for which the Company receives a management charge,
which amounted to (Pounds)49,000 during the year (1993:(Pounds)57,000). This
management charge is allocated by the parent to its subsidiaries based upon the
budgeted turnover for each subsidiary. Management of the parent is of the
opinion that the allocation method used is reasonable, as a more specific
allocation of the actual expenses is not practicable. In addition certain
central management personnel costs which are not separately identifiable have
been borne by the parent.
 
 b) Turnover
 
  Turnover, which excludes value added tax, represents the income receivable in
the ordinary course of business for goods and services provided.
 
 c) Stock and Work in Progress
 
  Stock and work in progress are, with the exception of long term contract work
in progress, valued at the lower of cost and net realisable value. Cost
includes the direct cost of materials and labour. Long term contract work in
progress is stated at costs incurred net of amounts transferred to cost of
sales, after deducting foreseeable losses and payments on account not matched
with turnover.
 
 d) Depreciation
 
  Depreciation of all fixed assets is provided on a straight line basis over
the estimated economic lives of individual assets, based on their cost, and the
rates generally applied range from 10% p.a. to 33 1/3% p.a.
 
 e) Research and Development
 
  Research and development expenditure is written off in the period during
which it is incurred.
 
 f) Contributions to Pension Schemes
 
  Contributions to pension schemes at rates recommended by independent
actuaries are charged to the profit and loss account on a consistent annual
basis.
 
 g) Interest
 
  Interest payable is written off to the profit and loss account as it is
incurred.
 
 h) Taxation
 
  The charge or credit for taxation is based on the result for the year as
adjusted for disallowable and non- taxable items.
 
  Consideration receivable or payable in respect of losses surrendered or
claimed by way of group relief is dealt with in the profit and loss account.
 
  The credit in respect of corporation tax has been computed in accordance with
the group accounting policy of Thames Water Plc. This represents an estimate of
the net present value of losses surrendered to other companies within the
Thames Water group under the provisions of UK tax legislation.
 
                                      F-5
<PAGE>
 
                          THE PERMUTIT COMPANY LIMITED
 
                (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)
 
                             NOTES TO THE ACCOUNTS
 
  Tax deferred or accelerated is accounted for in respect of all material
timing differences to the extent that it is probable that a liability or asset
will crystallise. Provision is made at the rate which is expected to be applied
when the liability or asset is expected to crystallise.
 
 i) Foreign Currency
 
  All transactions denominated in foreign currencies are translated into
sterling at the actual rate of exchange ruling on the date of the transaction.
Assets and liabilities in foreign currencies have been translated into sterling
at rates of exchange ruling at the balance sheet date. All exchange differences
arising are dealt with in the profit and loss account.
 
 j) Operating Lease Commitments
 
  These are provided for in the financial statements at the time the rental
liabilities arise.
 
 k) Cash and Cash Equivalents
 
  Cash and cash equivalents for the purpose of the cash flow statement comprise
cash at bank, current asset investments which are readily convertible into
known amounts of cash without notice and which are within three months of
maturity when acquired, less bank loans and overdrafts repayable within three
months from the date of the advance.
 
2. TURNOVER

<TABLE>     
<CAPTION>
                                             YEAR ENDED         YEAR ENDED
                                              31 MARCH           31 MARCH
                                                1994               1993
                                          ----------------- ------------------
                                              (Pounds)           (Pounds)
   <S>                                    <C>               <C>
   Geographical distribution by market
   United Kingdom........................         6,399,165          8,050,779
   Continental Europe....................           726,162            416,537
   Americas..............................           160,358            155,266
   Africa................................           275,461            311,153
   Australasia...........................            89,709             35,445
   Asia..................................           544,969          1,470,494
                                          ----------------- ------------------
                                          (Pounds)8,195,824 (Pounds)10,439,674
                                          ----------------- ------------------
</TABLE> 
 
3. INTEREST RECEIVABLE
 
<TABLE> 
<CAPTION>
                                             YEAR ENDED         YEAR ENDED
                                              31 MARCH           31 MARCH
                                                1994               1993
                                          ----------------- ------------------
                                              (Pounds)           (Pounds)
   <S>                                    <C>               <C>
   On bank and money market deposits.....               212              9,711
                                          ----------------- ------------------
                                                (Pounds)212      (Pounds)9,711
                                          ----------------- ------------------
</TABLE> 

4. INTEREST PAYABLE
 
<TABLE> 
<CAPTION>
                                             YEAR ENDED
                                              31 MARCH          YEAR ENDED
                                                1994          31 MARCH 1993
                                          ----------------- ------------------
                                              (Pounds)           (Pounds)
   <S>                                    <C>               <C>
   On bank loans and overdrafts..........            61,599             21,096
                                          ----------------- ------------------
                                             (Pounds)61,599     (Pounds)21,096
                                          ----------------- ------------------
</TABLE>    
 
                                       F-6

<PAGE>
 
 
                          THE PERMUTIT COMPANY LIMITED
 
                (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)
 
                             NOTES TO THE ACCOUNTS
 
5. PROFIT ON ORDINARY ACTIVITIES BEFORE TAXATION
 
<TABLE>
<CAPTION>
                                                         YEAR ENDED YEAR ENDED
                                                          31 MARCH   31 MARCH
                                                            1994       1993
                                                         ---------- ----------
                                                          (Pounds)   (Pounds)
   <S>                                                   <C>        <C>
   The profit on ordinary activities before taxation is
    stated after crediting:
     Gains on foreign currency borrowings/Deposits.....     6,557     22,525
     Profit on disposals of fixed assets...............    16,122     11,365
   And after charging:
     Depreciation and diminution in value of tangible
      assets...........................................   268,560    273,135
     Depreciation and diminution in value of intangible
      assets...........................................     5,425      5,425
     Auditors' remuneration............................    31,390     26,000
     Auditors' remuneration for non-audit services.....       585      7,512
     Loss on disposals of fixed assets.................     8,078      3,177
     Other operating lease rentals.....................   357,475    356,558
     Directors' emoluments.............................    61,733     62,932
     Research and development..........................    47,775    183,479
</TABLE>
 
6. EMPLOYEES
 
<TABLE>     
<CAPTION>
                                AVERAGE NUMBERS          AGGREGATE PAYROLL COSTS
                             --------------------- -----------------------------------
                             YEAR ENDED YEAR ENDED    YEAR ENDED        YEAR ENDED
                              31 MARCH   31 MARCH      31 MARCH          31 MARCH
                                1994       1993          1994              1993
                             ---------- ---------- ----------------- -----------------
                                                       (Pounds)          (Pounds)
   <S>                       <C>        <C>        <C>               <C>
   Production..............      53         68               856,111           946,629
   Marketing, selling &
    distribution...........      48         55             1,660,202         1,665,334
   Administration..........      20         24               419,025           399,119
                                ---        ---     ----------------- -----------------
                                121        147     (Pounds)2,935,338 (Pounds)3,011,082
                                ---        ---     ----------------- -----------------
   Aggregate payroll costs
    comprise:
     Wages & salaries......                                2,571,977         2,596,630
     Social security costs.                                  194,022           212,498
     Contributions to
      pension scheme.......                                  169,339           201,954
                                                   ----------------- -----------------
                                                   (Pounds)2,935,338 (Pounds)3,011,082
                                                   ----------------- -----------------
</TABLE>    
 
7. DIRECTORS' REMUNERATION
 
<TABLE>
<CAPTION>
                                                    YEAR ENDED     YEAR ENDED
                                                     31 MARCH       31 MARCH
                                                       1994           1993
                                                  -------------- --------------
                                                     (Pounds)       (Pounds)
   <S>                                            <C>            <C>
   Emoluments.................................... (Pounds)61,733 (Pounds)62,932
   Emoluments excluding pension contributions:
     Chairman....................................            NIL            NIL
     Highest paid Director....................... (Pounds)44,595 (Pounds)57,754
</TABLE>
 
  Number of Directors within the following ranges of emoluments excluding
pension scheme contributions:
 
<TABLE>
<CAPTION>
                                                                         NO. NO.
                                                                         --- ---
   <S>                                                                   <C> <C>
   Up to (Pounds)5,000..................................................   1   1
   (Pounds)10,001 to (Pounds)15,000.....................................   1  --
   (Pounds)40,001 to (Pounds)45,000.....................................   1  --
   (Pounds)55,001 to (Pounds)60,000.....................................  --   1
</TABLE>
 
                                      F-7
<PAGE>
 
 
                          THE PERMUTIT COMPANY LIMITED
                 
              (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)     
 
                             NOTES TO THE ACCOUNTS
 
8. TAXATION
 
<TABLE>
<CAPTION>
                                                YEAR ENDED       YEAR ENDED
                                                 31 MARCH         31 MARCH
                                                   1994             1993
                                              ---------------  --------------
                                                 (Pounds)         (Pounds)
   <S>                                        <C>              <C>
   No liability to UK corporation tax arises
    on the results for the year:
     Amounts receivable for Group relief
      surrendered...........................          238,084          84,847
     Deferred taxation account transfers....           (7,129)         (9,627)
                                              ---------------  --------------
   Total taxation for the year..............          230,955          75,220
   Adjustments of prior years...............            7,153           2,091
                                              ---------------  --------------
                                              (Pounds)238,108  (Pounds)77,311
                                              ---------------  --------------
</TABLE>
   
  The consideration receivable in respect of Group relief reflects the
estimated present value of the losses as agreed with the claimant companies.
    
9. INTANGIBLE ASSETS
 
<TABLE>     
<CAPTION>
                                                                   TRADEMARKS
                                                                 ---------------
                                                                    (Pounds)
   <S>                                                           <C>
   Cost:
     At 31 March 1993...........................................         216,995
                                                                 ---------------
     At 31 March 1994........................................... (Pounds)216,995
                                                                 ---------------
   Depreciation:
     At 31 March 1993...........................................          26,059
     Provided during year.......................................           5,425
                                                                 ---------------
     At 31 March 1994...........................................  (Pounds)31,484
                                                                 ---------------
   Net book value:
     At 31 March 1994........................................... (Pounds)185,511
                                                                 ---------------
     At 31 March 1993........................................... (Pounds)190,936
                                                                 ---------------
</TABLE>    
 
10. TANGIBLE ASSETS
 
<TABLE>     
<CAPTION>
                                                                FIXTURES
                                PLANT &          MOTOR         FITTINGS &
                               MACHINERY       VEHICLES         EQUIPMENT           TOTAL
                            --------------- ---------------  ---------------  -----------------
                               (Pounds)        (Pounds)         (Pounds)          (Pounds)
   <S>                      <C>             <C>              <C>              <C>
   Cost:
     At 31 March 1993......         444,717         627,468          917,666          1,989,851
     Additions at cost.....          15,034          93,639           21,080            129,753
     Disposals.............             --         (211,389)         (13,803)          (225,192)
                            --------------- ---------------  ---------------  -----------------
     At 31 March 1994...... (Pounds)459,751 (Pounds)509,718  (Pounds)924,943  (Pounds)1,894,412
                            --------------- ---------------  ---------------  -----------------
   Depreciation:
     At 31 March 1993......         187,131         301,263          597,027          1,085,421
     Provided during year..          30,833         145,674           92,053            268,560
     Disposals.............             --         (164,270)          (9,540)          (173,810)
                            --------------- ---------------  ---------------  -----------------
     At 31 March 1994...... (Pounds)217,964 (Pounds)282,667  (Pounds)679,540  (Pounds)1,180,171
                            --------------- ---------------  ---------------  -----------------
   Net book value:
     At 31 March 1994...... (Pounds)241,787 (Pounds)227,051  (Pounds)245,403  (Pounds)  714,241
                            --------------- ---------------  ---------------  -----------------
     At 31 March 1993...... (Pounds)257,586 (Pounds)326,205  (Pounds)320,639  (Pounds)  904,430
                            --------------- ---------------  ---------------  -----------------
</TABLE>    
 
                                      F-8
<PAGE>
 
                          THE PERMUTIT COMPANY LIMITED
 
                (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)
 
                             NOTES TO THE ACCOUNTS
 
11. INVESTMENTS
 
<TABLE>
<CAPTION>
                                                UNLISTED  SUBSIDIARY
                                                 AT COST  COMPANIES    TOTAL
                                                --------- ---------- ---------
   <S>                                          <C>       <C>        <C>
   Cost or valuation at 31 March 1994 and 31
    March 1993................................. (Pounds)1 (Pounds)5  (Pounds)6
</TABLE>
 
<TABLE>
<CAPTION>
                                                         31 MARCH  31 MARCH
                                                           1994      1993
                                                         --------- ---------
   <S>                                                   <C>       <C>
   Investment in subsidiary undertakings (see note 25):
   Shares at cost or valuation:                          (Pounds)5 (Pounds)5
</TABLE>
 
  In the opinion of the Directors the value of the Company's investment in its
subsidiary undertakings is not less than the figure stated above.
 
12. STOCKS
 
<TABLE>     
<CAPTION>
                                              31 MARCH           31 MARCH
                                                1994               1993
                                          -----------------  -----------------
                                              (Pounds)           (Pounds)
   <S>                                    <C>                <C>
   Raw materials and consumables........            606,948            740,434
   Work in progress (see below).........            180,264            136,630
   Finished goods and goods for resale..            169,647            207,208
                                          -----------------  -----------------
                                          (Pounds)  956,859  (Pounds)1,084,272
                                          -----------------  -----------------
   Work in progress includes:
   Long term contract costs incurred....            875,856          2,038,379
   WIP offset...........................            328,278                --
   Less: Progress claims made...........         (1,319,961)        (2,229,811)
                                          -----------------  -----------------
                                          (Pounds) (115,827) (Pounds) (191,432)
                                          -----------------  -----------------
   Representing:
   Carrying value of contracts in excess
    of progress claims made (included in
    Note 13)............................             15,539            168,695
   Progress claims made in excess of
    carrying value of contracts
    (included in Note 14)...............           (131,366)          (360,127)
                                          -----------------  -----------------
                                          (Pounds) (115,827) (Pounds) (191,432)
                                          -----------------  -----------------
</TABLE>    
 
13. DEBTORS
 
<TABLE>     
<CAPTION>
                                                31 MARCH          31 MARCH
                                                  1994              1993
                                            ----------------- -----------------
                                                (Pounds)          (Pounds)
   <S>                                      <C>               <C>
   Trade debtors...........................         1,820,016         2,726,746
   Amounts recoverable on contracts (see
    note below) ...........................            15,539           168,695
   Bills of exchange receivable............             8,126             5,085
   Amounts owed by parent & fellow
    subsidiaries...........................         3,711,599         3,576,762
   Other debtors...........................            17,672            25,202
   Prepayments and accrued income..........           100,521           143,773
                                            ----------------- -----------------
                                            (Pounds)5,673,473 (Pounds)6,646,263
                                            ----------------- -----------------
</TABLE>    
 
  Included within trade debtors of (Pounds)1,820,016 is (Pounds)73,782 falling
due after more than one year. Amounts recoverable on contracts include the
excess of turnover over payments on account.
 
                                      F-9

<PAGE>
 
                          THE PERMUTIT COMPANY LIMITED
 
                (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)
 
                             NOTES TO THE ACCOUNTS
 
14. CREDITORS: AMOUNTS FALLING DUE WITHIN ONE YEAR
 
<TABLE>
<CAPTION>
                                                31 MARCH          31 MARCH
                                                  1994              1993
                                            ----------------- -----------------
                                                (Pounds)          (Pounds)
   <S>                                      <C>               <C>
   Progress claims and advance payments....           131,366           360,127
   Trade creditors.........................           776,576         1,565,223
   Taxation (VAT & PAYE)...................            53,340           130,934
   Amounts owed to parent and fellow
    subsidiaries...........................           179,028           121,489
   Social security contributions...........            21,292            27,093
   Accruals and deferred income............           275,314           266,599
   Bank overdraft..........................         1,051,122           497,608
                                            ----------------- -----------------
                                            (Pounds)2,488,038 (Pounds)2,969,073
                                            ----------------- -----------------
</TABLE>
 
  Progress claims and advance payments include payments on account in excess of
amounts matched with turnover or offset against long term contract balances.
 
15. CREDITORS: AMOUNTS FALLING DUE AFTER MORE THAN ONE YEAR
 
<TABLE>
<CAPTION>
                                                               31 MARCH 31 MARCH
                                                                 1994     1993
                                                               -------- --------
                                                               (Pounds) (Pounds)
   <S>                                                         <C>      <C>
   Amounts owed to parent and fellow subsidiaries.............     5        5
</TABLE>
 
  Amounts owed to group companies are repayable after more than five years.
Interest on these amounts is charged at group rates.
 
16. PROVISIONS FOR LIABILITIES AND CHARGES
 
<TABLE>
<CAPTION>
                                   DEFERRED         OTHER
                                   TAXATION      PROVISIONS          TOTAL
                                -------------- ---------------  ---------------
                                   (Pounds)       (Pounds)         (Pounds)
   <S>                          <C>            <C>              <C>
   At 31 March 1993............         12,023          76,485           88,508
   Utilised during the year....            --          (76,485)         (76,485)
   Provided during the year....          7,129         155,900          163,029
                                -------------- ---------------  ---------------
   At 31 March 1994............ (Pounds)19,152 (Pounds)155,900  (Pounds)175,052
                                -------------- ---------------  ---------------
</TABLE>
 
<TABLE>
<CAPTION>
                                                      AMOUNT         AMOUNT
                                                     PROVIDED       PROVIDED
                                                     31 MARCH       31 MARCH
                                                       1994           1993
                                                  -------------- --------------
                                                     (Pounds)       (Pounds)
   <S>                                            <C>            <C>
   The provision for deferred taxation is:
   Excess of capital allowances over
    depreciation.................................         16,768          8,028
   Income assessable to tax in future years......          2,384          3,995
                                                  -------------- --------------
   Deferred tax liability........................ (Pounds)19,152 (Pounds)12,023
                                                  -------------- --------------
</TABLE>
 
  The liability for deferred taxation relating to the excess of capital
allowances over depreciation has been calculated at 33% (1993 33%).
 
  Other provisions consist of provisions for future expenditure on closed
contracts (Pounds)155,900 (1993 (Pounds)76,485).
 
                                      F-10
<PAGE>
 
                          THE PERMUTIT COMPANY LIMITED
 
                (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)
 
                             NOTES TO THE ACCOUNTS
 
17. SHARE CAPITAL
 
<TABLE>     
<CAPTION>
                                                                        ALLOTTED, CALLED UP
                                        AUTHORISED                        AND FULLY PAID
                            ----------------------------------- -----------------------------------
                                31 MARCH          31 MARCH          31 MARCH          31 MARCH
                                  1994              1993              1994              1993
                            ----------------- ----------------- ----------------- -----------------
   <S>                      <C>               <C>               <C>               <C>
   Ordinary shares of
    (Pounds)1 each......... (Pounds)5,800,000 (Pounds)5,800,000 (Pounds)5,800,000 (Pounds)5,800,000
                            ----------------- ----------------- ----------------- -----------------
</TABLE>    
   
18. RECONCILIATION OF MOVEMENTS IN SHAREHOLDERS' FUNDS     
 
<TABLE>
<CAPTION>
                                              YEAR ENDED         YEAR ENDED
                                               31 MARCH           31 MARCH
                                                 1994               1993
                                           -----------------  -----------------
                                               (Pounds)           (Pounds)
   <S>                                     <C>                <C>
   Loss for the financial year............          (966,190)          (337,552)
   Dividends..............................                -            (657,843)
                                           -----------------  -----------------
                                                    (966,190)          (995,395)
   Opening shareholders' funds............         5,833,185          6,828,580
                                           -----------------  -----------------
   Closing shareholders' funds............ (Pounds)4,866,995  (Pounds)5,833,185
                                           -----------------  -----------------
</TABLE>
 
19. CONTRACTS FOR CAPITAL EXPENDITURE
   
  Capital expenditure contracted for, and authorised but not contracted for, at
31st March 1994 for which no provision has been made in these accounts was:
    
<TABLE>
<CAPTION>
                                                   31 MARCH        31 MARCH
                                                     1994            1993
                                                --------------- ---------------
                                                   (Pounds)        (Pounds)
   <S>                                          <C>             <C>
   Contracted for..............................          13,422          48,660
   Authorised but not contracted for...........         205,589         180,419
                                                --------------- ---------------
                                                (Pounds)219,011 (Pounds)229,079
                                                --------------- ---------------
</TABLE>
 
20. LEASING COMMITMENTS
 
<TABLE>     
<CAPTION>
                                                   31 MARCH        31 MARCH
                                                     1994            1993
                                                --------------- ---------------
                                                   (Pounds)        (Pounds)
   <S>                                          <C>             <C>
   Operating leases:
     Amounts payable within one year........... (Pounds)293,021 (Pounds)314,853
                                                --------------- ---------------
   Commitments expiring:
     Land and buildings:
       Between two and five years..............             --            8,500
       More than five years....................         104,000         100,400
                                                --------------- ---------------
                                                        104,000         108,900
   Other operating leases:
     Less than one year........................          17,940          18,341
     Between one and two years.................         131,446          29,424
     Between two and five years................          25,086         143,639
     More than five years......................          14,549          14,549
                                                --------------- ---------------
                                                (Pounds)293,021 (Pounds)314,853
                                                --------------- ---------------
</TABLE>    
 
21. OTHER FINANCIAL COMMITMENTS
 
  Forward contracts existed at 31st March 1994 for the sale of foreign
currencies at a sterling equivalent of (Pounds)32,345 (1993 (Pounds)43,243).
 
 
                                      F-11
<PAGE>
 
                          THE PERMUTIT COMPANY LIMITED
 
                (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)
 
                             NOTES TO THE ACCOUNTS
 
22. GUARANTEES
 
  There are contingent liabilities in respect of guarantees given on our behalf
for plants installed or under construction and other engagements in the
ordinary course of business amounting to (Pounds)754,126 (1993
(Pounds)742,881).
 
23. HOLDING COMPANY
   
  The immediate holding company is Thames Water Products & Services Limited
incorporated in Great Britain and registered in England and Wales. The ultimate
holding Company, for which consolidated financial statements are prepared, is
Thames Water PLC incorporated in Great Britain and registered in England and
Wales. Copies of the consolidated financial statements can be obtained from
Thames Water Plc., 14 Cavendish Place, London W1M 9DJ.     
 
24. PENSIONS AND SIMILAR OBLIGATIONS
 
  Pension arrangements for the majority of the Company's employees are of the
defined benefit type funded through the Thames Water (PWT) Pension Scheme whose
assets are held separately from those of the Company in an independently
administered fund. The Thames Water (PWT) Pension Scheme also provides pension
benefits for employees of other companies within the Thames Water group.
 
  The total pension cost for the Company was (Pounds)169,339 (1993
(Pounds)201,954). The pension cost relating to the Thames Water (PWT) Pension
Scheme is assessed in accordance with advice received relating to the scheme as
a whole from Bacon & Woodrow, the consulting actuaries to the scheme.
 
  Details of the actuarial valuation of the Thames Water (PWT) Pension Scheme
are disclosed in the financial statements of Thames Water Plc.
 
25. SUBSIDIARY UNDERTAKING
 
  The subsidiary undertaking, Ion Exchange Ltd., is dormant and in the opinion
of the Directors is not material in terms of profit or assets.
 
  The subsidiary undertaking is wholly owned. It is incorporated in Great
Britain, registered in England and operates in the United Kingdom.
 
26. GROUP ACCOUNTS
 
  Under section 5 of the Companies Act 1989 group accounts are not required as
the company is itself a wholly owned subsidiary undertaking of another company
incorporated in an EEC country.
 
27. RECONCILIATION OF OPERATING PROFIT TO NET CASH INFLOW/(OUTFLOW) FROM
    OPERATING ACTIVITIES
 
<TABLE>
<CAPTION>
                                                          YEAR ENDED 31 MARCH
                                                          --------------------
                                                             1994       1993
                                                          ----------  --------
                                                           (Pounds)   (Pounds)
      <S>                                                 <C>         <C>
      Operating loss..................................... (1,142,911) (403,478)
      Depreciation on tangible fixed assets..............    273,985   278,560
      (Profit)/loss on sale of tangible fixed assets.....     (8,044)   (8,188)
      (Increase)/decrease in stocks......................    127,413  (143,836)
      (Increase)/decrease in debtors.....................  1,126,027   (78,752)
      Increase/(decrease) in creditors...................   (955,134)  373,603
                                                          ----------  --------
      Net cash inflow/(outflow) from operating
       activities........................................   (578,664)   17,909
                                                          ==========  ========
</TABLE>
 
                                      F-12

<PAGE>
 
 
                          THE PERMUTIT COMPANY LIMITED
 
                (A WHOLLY OWNED SUBSIDIARY OF THAMES WATER PLC)
 
                             NOTES TO THE ACCOUNTS
 
28. ANALYSIS OF THE BALANCE OF CASH AND CASH EQUIVALENTS
 
<TABLE>
<CAPTION>
                                                31 MARCH
                                           --------------------
                                              1994       1993    CHANGE IN YEAR
                                           ----------  --------  --------------
                                            (Pounds)   (Pounds)     (Pounds)
      <S>                                  <C>         <C>       <C>
      Cash at bank and in hand............        --     64,864      (64,864)
      Bank over drafts.................... (1,051,122) (497,608)    (553,514)
                                           ----------  --------     --------
      Decrease in cash and cash
       equivalents........................ (1,051,122) (432,744)    (618,378)
                                           ==========  ========     ========
</TABLE>
 
29. SUMMARY OF DIFFERENCES BETWEEN UK AND US GENERALLY ACCEPTED ACCOUNTING
    PRINCIPLES ("GAAP") AND OTHER US FINANCIAL INFORMATION
 
DEFERRED TAXES
 
  Under UK GAAP, provision is made for deferred tax under the liability method
where in the opinion of the Directors it is probable that a tax liability will
become payable within the forseeable future. Under US GAAP, deferred tax is
provided in full under the liability method. However, the net loss and total
net assets of the Permutit Company Limited is stated at the same amount under
both US and UK GAAP in respect of this matter.
 
 
CONSOLIDATED STATEMENTS OF CASH FLOWS
 
  Under UK GAAP, returns on investments and servicing of finance are shown as a
separate activity in the statement of cash flows. Under US GAAP, returns on
investments and taxation would be shown as cash flows from operating activities
and dividends paid would be shown as financing activities.
 
  The statement of cash flows is reconciled to an amount that includes bank
overdraft balances. Under US GAAP, changes to such balances are generally
included as financing activities.
 
  For US GAAP purposes, the following cash flow headings and totals would have
been reported.
 
<TABLE>       
<CAPTION>
                                  YEAR ENDED 31
                                      MARCH
                                ------------------
                                  1994      1993
                                --------  --------
                                (Pounds)  (Pounds)
                                --------  --------
      <S>                       <C>       <C>
      Net cash (used
       in)/provided by operat-
       ing activities.........  (548,051)  207,681
                                ========  ========
      Net cash (used in) in-
       vesting activities.....   (70,327) (329,296)
                                ========  ========
      Net cash provided
       by/(used in) financing
       activities.............   553,514  (160,235)
                                ========  ========
      Net increase/(decrease)
       in cash and cash equiv-
       alents.................   432,744  (281,850)
                                ========  ========
      Cash and cash equiva-
       lents at beginning of
       year...................    64,864   346,714
                                ========  ========
      Cash and cash equiva-
       lents at end of year...       --     64,864
                                ========  ========
</TABLE>    
 
  In addition, there are certain other aspects in which UK GAAP differs from US
GAAP, however these differences do not result in material adjustments to either
the reported loss or net assets for the years ended 31 March 1993 and 1994.
 
30. POST BALANCE SHEET EVENTS
   
   On April 3, 1995, United States Filter Corporation ("US Filter") acquired
all of the outstanding stock of the Company. US Filter has committed to provide
the necessary financial support to enable the Company to meet its debts as and
when they fall due effective for twelve months from the date of the
acquisition.     
 
                                      F-13
<PAGE>
 
  (b)  Pro forma financial information.


       The following unaudited pro forma combined financial data presents the
       Pro Forma Combined Balance Sheet at December 31, 1994, giving effect to
       the acquisition of The Permutit Company Limited, a U. K. company, and
       Permutit Company Pty Limited, an Australian company (collectively "The
       Permutit Group"), (the "Acquisition") as if it were consummated on that
       date. Also presented are the Pro Forma Combined Statements of Operations
       for the fiscal year ended March 31, 1994, and the nine months ended
       December 31, 1994, after giving effect to the Acquisition as if it was
       consummated on April 1, 1993. The pro forma data is based on the
       historical combined statements of the Company and The Permutit Group
       giving effect to the acquisition transaction under the purchase method of
       accounting and the assumptions and adjustments outlined in the
       accompanying Notes to Pro Forma Combined Financial Data. Under the
       purchase accounting method, assets acquired and liabilities assumed will
       be recorded at their estimated fair value at the date of Acquisition. The
       pro forma adjustments set forth in the following pro forma combined
       financial statements are estimates and may differ from the actual
       adjustments when they become known.

       The unaudited pro forma data is provided for comparative purposes only.
       It does not purport to be indicative of the results that actually would
       have occurred if the Acquisition had been consummated on the dates
       indicated or which may be obtained in the future. The pro forma combined
       financial data should be read in conjunction with the notes thereto and
       the audited financial statements of The Permutit Company Limited (a
       member of The Permutit Group) and the related notes thereto contained
       elsewhere herein and the audited consolidated financial statements of the
       Company and the related notes thereto filed in its report on Form 10-K
       for the year ended March 31, 1994.

                                     F-14
<PAGE>
 
                       PRO FORMA COMBINED BALANCE SHEET
                                  (unaudited)

<TABLE> 
<CAPTION> 

                                                               December 31, 1994
                               ---------------------------------------------------------------------------
                                                                                   Pro Forma
                                                                    --------------------------------------
                                       Historical                    Adjustments
                              -------------------------------         Increase     Adjustments
                                Company    The Permutit Group        (Decrease)     Reference    Combined
                              -----------  ------------------       -----------   ------------   ---------
                                                        (in thousands)
<S>                           <C>          <C>                      <C>           <C>            <C> 
Current assets:
   Cash                          $11,893         $771                 ($2,751)         a  (i)     $  9,913
   Short-term investments          7,624            -                  (7,624)         a  (i)            -
   Accounts receivable, net       87,325        3,350                                               90,675
   Cost and estimated earnings 
      in excess of billings on 
      uncompleted contracts       20,206            -                                               20,206
   Inventories                    36,623        1,356                                               37,979
   Prepaid expenses                4,853          194                                                5,047
   Deferred taxes                  2,598            -                                                2,598
   Other current assets            2,097          120                                                2,217
                                --------      -------                                             --------
       Total current assets      173,219        5,791                                              168,635
                                --------      -------                                             --------
Property, plant and equipment,
  net                             63,440        1,479                                               64,919
Investment in Mexico leasehold 
  interest, net                   21,634            -                                               21,634
Goodwill, net                     97,510                                7,104          a (ii)      104,614
Other assets                      17,960          281                                               18,241
                                --------      -------                                             --------
                                $373,763       $7,551                                             $378,043
                                ========      =======                                             ========

LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities:
   Accounts payable              $28,812       $1,712                                              $30,524
   Accrued liabilities            40,567          953                                               41,520
   Current portion of long-term
    debt                           1,078            -                                                1,078
   Notes payable                  23,818            -                                               23,818
   Billings in excess of costs 
    and estimated earnings on 
    uncompleted contracts         15,715            -                                               15,715
   Other current liabilities       7,769        1,254                                                9,023
                                --------      -------                                             --------
       Total current 
         liabilities             117,759        3,919                                              121,678
                                --------      -------                                             --------
Long-term debt, excluding 
  current portion                  7,936            -                                                7,936
Convertible subordinated debt    105,000            -                                              105,000
Loan (receivable) payable 
  --Parent                             -       (5,295)                  5,295          c                 -
Deferred taxes                     5,774            -                                                5,774
Other liabilities                  3,620          361                                                3,981
                                --------      -------                                             --------
       Total liabilities         240,089       (1,015)                                             244,369
                                --------      -------                                             --------
Shareholders' equity:
   Convertible preferred stock    25,577            -                                               25,577
   Common stock                      150            -                                                  150
   Additional paid-in capital    128,496        9,380                  (9,380)         b           128,496
   Translation adjustment            215            -                                                  215
   Accumulated deficit           (20,764)        (814)                    814          b           (20,764)
                                --------      -------                                             --------
       Total shareholders' equi  133,674        8,566                                              133,674
                                --------      -------                                             --------
                                $373,763       $7,551                                             $378,043
                                ========      =======                                             ========
</TABLE> 

The accompanying notes are an integral part of these pro forma combined
financial data.

                                     F-15
<PAGE>
 

                  Pro Forma Combined Statement of Operations
                                  (Unaudited)
<TABLE> 
<CAPTION> 

                                                 Fiscal Year Ended March 31, 1994
                               ---------------------------------------------------------------------------
                                                                                   Pro Forma
                                                                    --------------------------------------
                                       Historical                    Adjustments
                              -------------------------------         Increase     Adjustments
                                Company    The Permutit Group        (Decrease)     Reference    Combined
                              -----------  ------------------       -----------   ------------   ---------
                                                        (in thousands)
<S>                           <C>          <C>                      <C>           <C>            <C> 
Revenues                        $180,421      $19,687                                             $200,108

Cost of sales                    132,811       12,545                                              145,356
                                --------      -------                                             --------
       Gross profit               47,610        7,142                                               54,752

Selling, general and
   administrative expenses        52,484        8,601                    280             d          61,365
                                --------      -------                                             --------
       Operating income           (4,874)      (1,459)                                              (6,613)
                                --------      -------                                             --------

Other income (expense):
       Interest expense           (2,077)        (109)                                              (2,186)
       Other                       1,174           50                                                1,224
                                --------      -------                                             --------
                                    (903)         (59)                                                (962)
                                --------      -------                                             --------
       Income before income 
        taxes                     (5,777)      (1,518)                                              (7,575) 

Provision for income taxes        (3,236)        (364)                                              (3,600)
                                --------      -------                                             --------
       Net income                ($2,541)     ($1,154)                                             ($3,975)
                                ========      =======                                             ========
       Net income per common 
        share                     ($0.26)                                                           ($0.38)
                                ========                                                          ========

Weighted average number of
   shares outstanding             12,453                                                            12,453
                                ========                                                          ========
</TABLE> 

The accompanying notes are an integral part of these pro forma combined 
financial data.

                                     F-16
<PAGE>
 
                  Pro Forma Combined Statement of Operations 
                                         (Unaudited)
<TABLE> 
<CAPTION> 

                                                      Nine Months Ended December 31, 1994
                               ---------------------------------------------------------------------------
                                                                                   Pro Forma
                                                                    --------------------------------------
                                       Historical                    Adjustments
                              -------------------------------         Increase     Adjustments
                                Company    The Permutit Group        (Decrease)     Reference    Combined
                              -----------  ------------------       -----------   ------------   ---------
                                                        (in thousands)
<S>                           <C>          <C>                      <C>           <C>            <C> 
Revenues                        $194,453      $13,916                                             $208,369

Cost of sales                    139,164        8,587                                              147,751
                                --------      -------                                             --------
       Gross profit               55,289        5,329                                               60,618

Selling, general and
   administrative expenses        45,819        5,199                     205           d           51,223
                                --------      -------                                             --------
       Operating income            9,470          130                                                9,395
                                --------      -------                                             --------

Other income (expense):
       Interest expense           (3,632)         (65)                                              (3,697)
       Other                       1,641            6                                                1,647
                                --------      -------                                             --------
                                  (1,991)         (59)                                              (2,050)
                                --------      -------                                             --------
       Income before income 
         taxes                     7,479           71                                                7,345

Provision for income taxes         2,056         (119)                                               1,937
                                --------      -------                                             --------
       Net income               $  5,423       $  190                                             $  5,408
                                ========      =======                                             ========

       Net income per common 
        share                   $   0.33                                                          $   0.33
                                ========                                                          ========

Weighted average number of
   shares outstanding             14,881                                                            14,881
                                ========                                                          ========
</TABLE> 

The accompanying notes are an integral part of these pro forma combined
financial data.

                                     F-17
<PAGE>
 
               NOTES TO PRO FORMA COMBINED FINANCIAL INFORMATION


  a.   The pro forma combined balance sheet has been prepared to reflect the
       acquisition of The Permutit Group by the Company for aggregate estimated
       all-cash purchase price of $10,375,000 (including estimated acquisition
       costs of $375,000).

       The estimated tangible net book value, as adjusted, of The Permutit Group
       and the fair value of the net assets as of the Closing Date are both
       assumed to be $3,271,000. The difference between the estimated purchase
       price and the estimated fair value of the net assets of The Permutit
       Group is approximately $7,104,000, which has been recorded as costs in
       excess of net assets of businesses acquired attributable to the
       Acquisition in the accompanying pro forma combined balance sheet.

       The pro forma combined balance sheet has been adjusted to reflect the
       above as follows:

                 (i)   To record the payment of cash and estimated
                       transaction costs;

                 (ii)  To adjust goodwill for the difference between the
                       estimated purchase price and the estimated fair value of
                       the net assets acquired;

  b.   The pro forma combined balance sheet has been adjusted to eliminate the
       equity of The Permutit Group.


  c.   The pro forma combined balance sheet has been adjusted to eliminate the
       net loan receivable of The Permutit Company Limited from its parent
       company.

  d.   The pro forma combined statements of operations give effect to the
       additional goodwill amortization that results from the Acquisition.

                                     F-18

<PAGE>
 
                                                                  CONFORMED COPY

                             DATED 3rd April 1995
                             --------------------








                   THAMES WATER PRODUCTS & SERVICES LIMITED
                             PWT OVERSEAS LIMITED
                                
                                      and

                         IONPURE TECHNOLOGIES LIMITED

                                      and

                               THAMES WATER PLC

                                      and

                       UNITED STATES FILTER CORPORATION







                        _______________________________

                           SHARE PURCHASE AGREEMENT
                        _______________________________














                               Slaughter and May
                             35 Basinghall Street
                               London  EC2V 5DB

                                  (RCS/AJZP)
<PAGE>
 
                           SHARE PURCHASE AGREEMENT
                           ------------------------

                                   CONTENTS
                                   --------

                                                         
<TABLE>
<C>     <S>
1.      Interpretation                                              
2.      Sale and purchase                                                                          
3.      Consideration                                                                              
4.      Completion                                                                                 
5.      Preparation of the Completion Accounts                                     
6.      Seller's Warranties and Undertakings                                       
7.      Purchaser's and Purchaser's Guarantor's 
        Warranties and Undertakings                                                        
8.      Purchaser's remedies and Seller's limitations on liability         
9.      Guarantees                                                                                 
10.     Restrictions on Seller's business activities                               
11.     Isleworth underlease and assignment of lease
        of property at Doncaster                                                                   
12.     Pensions                                                                                           
13.     Intellectual Property                                                              
14.     Effect of Completion                                                               
15.     Remedies and waivers                                                               
16.     Assignment                                                                              
17.     Entire agreement                                                                        
18.     Notices                                                                                    
19.     Announcements                                                                              
20.     Confidentiality                                                                    
21.     Restrictive Trade Practices Act 1976                                    
22.     Costs and expenses                                                                         
23.     Counterparts                                                                               
24.     Time of essence                                                                    
25.     Invalidity                                                                                 
26.     Language                                                                                           
27.     Choice of governing law                                                            
28.     Jurisdiction                                                                               
29.     Agent for Service                                                                          
</TABLE>
<PAGE>
 
THIS AGREEMENT is made on 3rd April 1995 BETWEEN:

(1)     THAMES WATER PRODUCTS & SERVICES LIMITED (whose registered number is
        315984) whose registered office is situated at 14 Cavendish Place,
        London W1M ONU ("TWPS") and PWT Overseas Limited (whose registered
        number is 724 065) whose registered office is situated at 14 Cavendish
        Place, London W1M 0NU ("PWT") (the "Sellers"); and

(2)     IONPURE TECHNOLOGIES LIMITED (whose registered number is 2417739) whose
        registered office is situated at Harforde Court, Foxholes Business Park,
        John Tate Road, Hertford SG13 7NW (the "Purchaser").

(3)     THAMES WATER PLC (whose registered number is 2366623) whose registered
        office is situated at 14 Cavendish Place, London W1M 0NU ("the Sellers'
        Guarantor"); and

(4)     UNITED STATES FILTER CORPORATION (registered in Delaware) whose
        principal office is situated at 73-710 Fred Waring Drive, Suite 222,
        Palm Desert, California, 92260 ("the Purchaser's Guarantor")

WHEREAS:

(A)     Particulars of the Companies (as defined in this agreement) are set out
        in schedule 5 (Basic information about the Companies).

(B)     TWPS is the beneficial owner of the whole of the issued and allotted
        share capital in Permutit UK.

(C)     PWT is the beneficial owner of the whole of the issued and allotted
        share capital in Permutit Australia.

(D)     The Sellers have agreed to sell and the Purchaser has agreed to purchase
        and pay for the Shares (as defined in this agreement) in each case on
        the terms and subject to the conditions set out in this agreement.

(E)     The Sellers' Guarantor is the indirect beneficial owner of the entire
        issued share capital of the Sellers.

(F)     The Purchaser's Guarantor is the indirect beneficial owner of the entire
        issued share capital of the Purchaser.

WHEREBY IT IS AGREED as follows:

1.      INTERPRETATION

(A)     In this agreement and the schedules to it:

        " Accounts"                                means the audited financial
<PAGE>
 
                                       2



                                     statements of Permutit UK, prepared in
                                     accordance with the Companies Acts, for the
                                     accounting reference period ended on 31st
                                     March 1994, and the audited financial
                                     consolidated statements of Permutit
                                     Australia and its subsidiaries prepared in
                                     accordance with the Corporations Law and
                                     Australian generally accepted accounting
                                     standards for the financial year ended 31st
                                     March, 1994, and the reports, accounts and
                                     other documents required by law to be
                                     attached thereto copies of which have, for
                                     the purpose of identification only, been
                                     initialled by the Seller's Solicitors and
                                     delivered to the Purchaser or the
                                     Purchaser's Solicitors;


        "Accounts Date"              means 31st March 1994;

        "Asbestos Claim"             means any claim made against Permutit UK in
                                     respect of personal injury, the cause of
                                     which is the asbestos at the Manchester
                                     Property;

        " Available Items"           means items made available pursuant to
                                     clause 13(G);

        "Australian Licence"         means the licence agreement dated 7th
                                     October, 1993 made between Kevin McEntee &
                                     Associates Pty Ltd and Permutit Australia
                                     of Suite 12, 154 Fullarton Road, Rose Park;

        "Australian Property"        means the Property described in Part C of
                                     schedule 8 (Immovable Properties);

        "Books and Records"          has its common law meaning and includes,
                                     without limitation, all notices,
                                     correspondence, orders, inquiries,
                                     drawings, plans, books of account and other
                                     documents and all computer disks or tapes
                                     or other machine legible programs or other
                                     records;
<PAGE>
 
                                       3

        "Business Day"               means a day (other than a Saturday or a
                                     Sunday) on which banks are open for
                                     business in London and Sydney and Auckland;

        "Business Information"       means all information, know-how and records
                                     (whether or not confidential and in
                                     whatever form held) including (without
                                     limitation) all formulas, designs,
                                     specifications, drawings, data, manuals and
                                     instructions and all customer lists,
                                     supplier lists, sales information, business
                                     plans and forecasts, and all technical or
                                     other expertise and all computer software
                                     and all accounting and tax records,
                                     correspondence, orders and inquiries
                                     relating to the Group;

        "Business of the Group"      means all businesses as at the date of
                                     Completion undertaken by the Group
                                     Companies and which are concerned with the
                                     sale or supply of products, systems and
                                     services (including without limitation
                                     catalogue products and systems,
                                     HEAVC/commercial softeners, and pre-
                                     engineered systems) used in industrial
                                     water purification, laboratory water
                                     purification, other non-municipal water
                                     purification, industrial wastewater
                                     treatment and other non-municipal
                                     wastewater treatment;
        
        "Claim for Tax"              means a notice of assessment, a written
                                     decision by an Inspector of the Board, the
                                     New Zealand Inland Revenue, the Australian
                                     Inland Revenue, any other Tax Authority,
                                     determination of an appeal by the
                                     Commissioners, the New Zealand
                                     Commissioners, the Australian Commissioners
                                     and a decision of any Court from which
                                     assessment, decision or determination it
                                     appears that a Tax Liability has, will or
                                     is likely to be imposed on any Group
                                     Company or any member of the Purchaser's
                                     Group for which the Purchaser does or will
                                     or would
<PAGE>
 
                                       4

                                     have a claim against the Sellers under the
                                     provisions of this agreement or the Tax
                                     Covenant;

        "Companies Acts"             means the Companies Act 1985, the Companies
                                     Consolidation (Consequential Provisions)
                                     Act 1985, the Companies Act 1989 and Part V
                                     of the Criminal Justice Act 1994;

        "Companies"                  means The Permutit Company Limited and The
                                     Permutit Company Pty Ltd, basic information
                                     concerning which is set out in schedule 5
                                     (Basic information about the Companies)and
                                     each is referred to as a "Company";

        "Completion"                 means completion of the sale and purchase
                                     of the Shares under this agreement;

        "Completion Accounts"        means the accounts prepared in accordance
                                     with clause 5 for the purpose of
                                     establishing the Net Asset Value;

        "Confidential Business
        Information"                 means Business Information which is
                                     confidential or not generally known;

        "Corporations Law"           means the Corporations Law of New South
                                     Wales and other jurisdictions of Australia
                                     as it applies to Permutit Australia;

        " Deed of Assignment"        means a deed of assignment in the form
                                     attached to the Disclosure Letter to be
                                     entered into by TWPS in favour of the
                                     Purchaser;

        "Disclosure Letter"          means the letter of even date herewith
                                     written by the Seller to the Purchaser for
                                     the purposes of clause 8(B) (Purchaser's
                                     remedies and Sellers' limitations on
                                     liability) and delivered to the Purchaser's
                                     Solicitors before the execution of this
                                     agreement;
<PAGE>
 
                                       5

        "Dubai Leases"               means the two lease agreements in the name
                                     of Permutit UK dated 25th July, 1994 and
                                     18th December, 1994 in respect of apartment
                                     708 Golden Sands III and apartment 715
                                     Golden Sands I;

        " Egypt Side Letter"         an agreement of even date herewith made
                                     between PWT Projects Limited and the
                                     Purchaser;

        "Egypt Trade Mark User       means the agreement contained in 
        Agreement"                   Part B of Schedule 14;

        "Employee"                   means any person employed at the date of
                                     this agreement by any member of the Group
                                     including any director of any member of the
                                     Group;

        "Environment"                consists of all, or any, of the following
                                     media: namely, air (including the air
                                     within buildings and the air within other
                                     natural or man-made structures above or
                                     below ground), water (including
                                     territorial, coastal and inland waters and
                                     natural water and drains and sewers) and
                                     land (including sea bed or river bed under
                                     any water as described above, surface land
                                     and sub-surface land);

        "Environmental Approvals"    means permits, consents, licences, and
                                     other authorisations and approvals required
                                     under Environmental Laws to be obtained in
                                     connection with the use of any of the
                                     Properties or the conduct of the business
                                     of any Group Company;

        "Environmental Laws"         means, in relation to any Group Company:

                                                (i)     all current and previous
                                                        national or local
                                                        statutes, codes,
                                                        directives, notes or
                                                        other laws or
                                                        legislation concerning
                                                        Environmental Matters
                                                        which are applicable at
                                                        or prior to the date of
                                                        this agreement to any of
                                                        the
<PAGE>
 
                                       6

                                                        Properties or the
                                                        conduct of the Group
                                                        Company's business at
                                                        any of the Properties
                                                        and all rules,
                                                        regulations, ordinances,
                                                        orders, notices and
                                                        directives made
                                                        thereunder at or prior
                                                        to the date of this
                                                        agreement;

                                                (ii)    judicial and
                                                        administrative
                                                        interpretations of each
                                                        of the foregoing;

        "Environmental Liabilities"             means liability under
                                                Environmental Laws in relation
                                                to Environmental Matters
                                                including (without limitation)
                                                monetary claim or fine, actual
                                                liability to make good, repair,
                                                reinstate, treat or clean up:-

                                                (i)     any of the Properties or
                                                        any property previously
                                                        owned or occupied by any
                                                        Group Company;

                                                (ii)    any place where any
                                                        Group Company has caused
                                                        or permitted any
                                                        Hazardous Materials to
                                                        be sent, spilt,
                                                        discharged, disposed of,
                                                        displaced or otherwise
                                                        directly or indirectly
                                                        to become located; or

                                                (iii)   otherwise arising out of
                                                        or in connection with
                                                        the business of any
                                                        Group Company;

        " Environmental Matters"                means:-
         
                                                (i)     the disposal, release,
                                                        spillage, deposit,
                                                        escape, discharge, leak
                                                        or emission of, contact
                                                        with, or exposure of any
                                                        person to, Hazardous
                                                        Materials or Waste;

                                                (ii)    the creation of any
                                                        noise, vibration,
                                                        radiation, common law or
                                                        statutory nuisance, or
                                                        other adverse impact on
                                                        the Environment;
<PAGE>
 
                                       7

                                                (iii)   any other matters
                                                        relating to the
                                                        condition, protection,
                                                        maintenance, restoration
                                                        or replacement of the
                                                        Environment or any part
                                                        of it arising directly
                                                        or indirectly out of the
                                                        manufacturing,
                                                        processing, treatment,
                                                        keeping, handling, use
                                                        (including as a building
                                                        material),possession,
                                                        supply, receipt, sale,
                                                        purchase, import,
                                                        export, transportation
                                                        or presence of Hazardous
                                                        Materials or Waste;

        "Group"                                 means the Companies and all the
                                                Subsidiaries;

        "Group Company"                         means any Company or Subsidiary;

        "Hazardous Materials"                   includes any substance, whether
                                                solid, liquid or gaseous and
                                                noise or electromagnetic or
                                                other radiation which in any
                                                case is capable of causing harm
                                                to man or any other living
                                                organism supported by the
                                                Environment;

        "ICTA 1988"                             means the Income and Corporation
                                                Taxes Act 1988;

        "Immovable Property"                    means freehold, leasehold or
                                                other immovable property in any
                                                part of the world;

        "Information Memoranda"                 means the information memorandum
                                                prepared by Coopers and Lybrand
                                                on the Group, dated December,
                                                1994 as attached to the
                                                Disclosure Letter;

        "Intellectual Property"                 means patents, trade names,
                                                trade marks and service marks,
                                                registered designs, rights in
                                                designs, trade or business
                                                names, copyrights (including
                                                rights in computer software) and
                                                topography rights (whether or
                                                not any of these are registered
                                                and including applications for
                                                registration of any such thing)
                                                and all rights or forms of
                                                protection of a similar nature
                                                or having equivalent or
<PAGE>
 
                                       8

                                                similar effect to any of these
                                                which may subsist anywhere in
                                                the world;

        "Isleworth Property"                    the property known as Pemberton
                                                House, 632-652 London Road,
                                                Isleworth;

        "ITA 1984"                              means the Inheritance Tax Act
                                                1984;

        " Items"                                means:-

                                                (i)     the Specified Items; and

                                                (ii)    any other drawings or
                                                        documents containing
                                                        know-how or technical
                                                        information which has at
                                                        any time been used in
                                                        the business of the
                                                        relevant Group Company;

        " Loan Note"                            a L2,785,345 nominal loan note
                                                issued by TWPS in the form
                                                attached to the Disclosure
                                                Letter;

        "London Stock Exchange"                 means the International Stock
                                                Exchange of the United Kingdom
                                                and the Republic of Ireland
                                                Limited;

        "Management Accounts"                   means the management accounts of
                                                each of the Companies as at 28th
                                                February 1995, in the form
                                                attached to the Disclosure
                                                Letter;

        "Manchester Property"                   means Units B1 and B2, Floats
                                                Road Industrial Estate,
                                                Wythenshawe, Manchester;

        "Net Asset Value"                       means the aggregate of the
                                                Companies' assets including the
                                                Companies' intangible assets
                                                less the aggregate of the
                                                Companies' liabilities
                                                calculated in accordance with
                                                generally accepted accounting
                                                principles but ignoring for this
                                                purpose, any bank indebtedness
                                                owed by any Group Company and
                                                any sums owed to any Group
                                                Company by any member of the
                                                Retained Group or vice versa,
                                                other than by way of trading in
                                                the ordinary course;
<PAGE>
 
                                       9

        "New Zealand Property"                  means the Property described in
                                                Part B of schedule 8 (Immovable
                                                Properties);

        "Panel"                                 means the Panel on Takeovers and
                                                Mergers;

        "Permitted Businesses"                  means the businesses specified
                                                in clause 10(E) (Restrictions on
                                                Sellers' business activities);

        "Permutit Australia"                    means The Permutit Company Pty
                                                Ltd;

        "Permutit Australia Shares"             means all the issued share
                                                capital of Permutit Australia;

        "Permutit Brand Name"                   means the registered and
                                                unregistered Intellectual
                                                Property using the name
                                                "Permutit" as set out in the
                                                schedule which is annexed to the
                                                Disclosure Letter;

        "Permutit New Zealand"                  means Permutit New Zealand
                                                Limited;

        "Permutit UK"                           means The Permutit Company
                                                Limited;

        "Permutit UK Shares"                    means all the issued share
                                                capital of Permutit UK;

        "Pontyclun Claims"                      means any claim made against any
                                                member of the Group including,
                                                without limitation, claims in
                                                respect of any personal injury
                                                or environmental matter arising
                                                from or in respect of the
                                                business which was carried on by
                                                Permutit UK at Pontyclun, South
                                                Wales;

        "Proceedings"                           means any proceeding, suit or
                                                action arising out of or in
                                                connection with this agreement;

        "Properties"                            means the Immovable Property
                                                listed in schedule 8 (Immovable
                                                Properties owned by members of
                                                the Group);

        "Purchaser's Accountants"               means Giess Wallis Crisp;

        "Purchaser's Group"                     means the Purchaser, its
                                                subsidiaries and subsidiary
                                                undertakings, any holding
                                                company of the Purchaser and all
                                                other
<PAGE>
 
                                       10

                                                subsidiaries of any such holding
                                                company from time to time;

        "Purchase Price"                        means the consideration referred
                                                to in clause 3 (Consideration);

        "Purchaser's Solicitors"                means Fox Williams;

        "Relief"                                has the meaning given in the Tax
                                                Covenant;

        "Retained Group"                        means the Sellers, their
                                                subsidiaries and subsidiary
                                                undertakings any holding company
                                                of the Sellers and all other
                                                subsidiaries and subsidiary
                                                undertakings of any such holding
                                                company from time to time
                                                (except any member of the
                                                Group);

        "RTPA"                                  means the Restrictive Trade
                                                Practices Acts 1976 and 1977;

        "Sellers' Accountants"                  means Coopers & Lybrand;

        "Sellers' Solicitors"                   means Slaughter and May;

        "Shares"                                means the Permutit UK shares and
                                                the Permutit Australia shares;

        "South Africa Trade Mark                means the agreement set out in
        User Agreement"                         Part B of Schedule 14; 

        " Specified Intellectual                means any Intellectual Property
        Property"                               in any Specified Items which the
                                                Sellers have warranted under
                                                sub-clause 7(H)(ix) of Schedule
                                                2 to be in the possession of any
                                                of the Group Companies;

        "Specified Items"                       means the items referred to in
                                                schedule 11;

        "Subsidiary"                            means at any relevant time any
                                                then subsidiary or subsidiary
                                                undertaking of either of the
                                                Companies, basic information
                                                concerning each current
                                                subsidiary and subsidiary
                                                undertaking being set out in
                                                schedule 6 (Basic information
                                                about the Subsidiaries and
                                                Subsidiary Undertakings);
<PAGE>
 
                                       11


        "Tax" or "Taxation"                     has the meaning given in the Tax
                                                Covenant;

        "Taxes Act 1976"                        means the New Zealand Income Tax
                                                Act 1976;

        "Tax Authority"                         has the meaning given in the Tax
                                                Covenant;

        "Tax Covenant"                          means the tax covenant referred
                                                to in schedule 1 (Completion
                                                arrangements) entered into at
                                                Completion between the parties
                                                to this agreement;

        "Tax Liability"                         has the meaning given in the Tax
                                                Covenant;

        "Tax Warranties"                        means the warranties set out in
                                                clause 10 of Schedule 2;

        "TCGA 1992"                             means the Taxation of Chargeable
                                                Gains Act 1992;

        "TMA 1970"                              means the Taxes Management Act
                                                1970;

        "Transaction"                           has the meaning given in the Tax
                                                Covenant;

        "UK Properties"                         means the Properties listed in
                                                Part A of schedule 8 (Immovable
                                                Properties);

        "VATA"                                  means the Value Added Tax Act
                                                1994;

        "VAT Legislation"                       means the VATA and all other
                                                enactments in relation to value
                                                added tax and all notices,
                                                provisions and conditions made
                                                or issued thereunder including
                                                the terms of any agreement
                                                reached with HM Commissioners of
                                                Customs and Excise or any
                                                concession relating to VAT
                                                referred to in the Disclosure
                                                Letter;

        "Warranties"                            means the warranties set out in
                                                schedule 2 (Warranties) and
                                                schedule 7 (Pensions) given by
                                                the Sellers;
<PAGE>
 
                                       12

        "Waste"                                 means any waste (including
                                                anything which is abandoned,
                                                unwanted or surplus)
                                                irrespective of whether it is
                                                capable of being recovered or
                                                recycled or has any value;

        "Working Hours"                         means 9.30 a.m. to 5.30 p.m. on
                                                a Business Day.

(B)     In this agreement, unless otherwise specified:

        (i)     references to clauses, sub-clauses, paragraphs, sub-paragraphs,
                parts and schedules are to clauses, sub-clauses, paragraphs,
                sub-paragraphs and parts of, and schedules to, this agreement;

        (ii)    a reference to any statute or statutory provision shall, be
                construed as a reference to the same as was in effect at the
                relevant date (including any amendments, modifications or re-
                enactments prior to such date in effect on such date) or as it
                may have been, or may from time to time be, amended, modified or
                re-enacted;

        (iii)   references to a "company" shall be construed so as to include
                any company, corporation or other body corporate, wherever and
                however incorporated or established;

        (iv)    references to a "person" shall be construed so as to include any
                individual, firm, company, government, state or agency of a
                state or any joint venture, association or partnership (whether
                or not having separate legal personality);

        (v)     the expressions "accounting reference date", "accounting
                reference period", "allotment", "body corporate", "current
                assets", "debentures", "holding company", "paid up", "profit and
                loss account" "subsidiary", "subsidiary undertaking" and
                "wholly-owned subsidiary" shall have the meaning given in the
                Companies Acts; and in relation to Permutit Australia "current
                assets", "debentures", "profit and loss account" and "financial
                year" have the meaning given in or applicable under the
                Corporations Law and in relation to Permutit New Zealand
                "debentures", "holding company" and "subsidiary" shall have the
                meanings given in the Companies Act 1955;

        (vi)    a person shall be deemed to be "connected" with another if that
                person is connected with another within the meaning of section
                839 ICTA 1988;

       (vii)    references to writing shall include any modes of reproducing
                words in a legible and non-transitory form;

      (viii)    references to times of day are to London time;
<PAGE>
 
                                       13

        (ix)    headings to clauses and schedules are for convenience only and
                do not affect the interpretation of this agreement;

        (x)     words importing the singular number include the plural and vice
                versa; and

        (xi)    the schedules form part of this agreement and shall have the
                same force and effect as if expressly set out in the body of
                this agreement, and any reference to this agreement shall
                include the schedules.

2.      SALE AND PURCHASE

(A)     TWPS shall sell as beneficial owner the Permutit UK Shares and PWT shall
        sell as beneficial owner the Permutit Australia Shares and the Purchaser
        relying on the representations, warranties and undertakings herein
        contained shall purchase, subject to clause 2(B), the Shares. The Shares
        shall be free from all claims, liens, charges, encumbrances and options,
        equities or any similar right and shall be sold with all rights attached
        or accruing to them at Completion.

(B)     The Purchaser shall not be obliged to complete the purchase of any of
        the Shares unless the purchase of all the Shares is completed
        simultaneously in accordance with this agreement.

(C)     The Purchaser shall be entitled to exercise all rights now attached or
        hereafter accruing to the Shares including, without limitation, the
        right to receive all dividends, distributions or any return of capital
        declared, paid or made by the Companies in respect of periods commencing
        on or after Completion.

(D)     The Sellers waive and shall procure that all rights of pre-emption over
        any of the Shares conferred by the articles of association of either of
        the Companies or in any other way are waived.

3.      CONSIDERATION 

        The consideration for the purchase of the Shares shall be the payment by
the Purchaser of the sum of L9,053,382 which shall be apportioned between the
Shares as to L7,799,775 in respect of Permutit UK and L1,253,607 in respect of
Permutit Australia and shall be payable in accordance with clause 4
(Completion). 

4.      COMPLETION

(A)     Prior to Completion:-

        (i)     TWPS shall procure that the overdraft of Permutit UK is
                discharged;
<PAGE>
 
                                       14

        (ii)    Permutit UK shall execute the Deed of Assignment in favour of
                the Purchaser in consideration for the creation of an interest
                free debt in a sum equal to the nominal value of the Loan Note.

(B)     Completion shall take place immediately following the signing of this
        agreement at the offices of the Sellers' Solicitors at 35 Basinghall
        Street, London EC2V 5DB.

(C)     At Completion the Seller shall do the things listed in Part A of
        schedule 1 (Completion arrangements).  

(D)     At Completion, the Purchaser shall do the things listed in Part B of
        schedule 1 (Completion arrangements).  

(E)     Payment of the Purchase Price in accordance with paragraph (i) of part B
        of schedule 1 (Completion arrangements) shall constitute payment of the
        consideration for the Shares and shall discharge the obligations of the
        Purchaser under clause 2 (Sale and Purchase).  

(F)     The solicitors to any party to this agreement are authorised to take
        delivery on behalf of such party of any items hereunder and their
        receipt shall be a good discharge therefor to the party and the
        solicitors to the party making delivery, and the Purchaser shall not be
        concerned to see that the Purchase Price is delivered to and applied
        towards payment of the Sellers' entitlements pursuant to this agreement.

(G)     After Completion, the Sellers shall do the things listed in Part C of
        Schedule 1 (Completion arrangements).

5.      PREPARATION OF THE COMPLETION ACCOUNTS

(A)     The Sellers shall use all reasonable endeavours to procure the prompt
        preparation (and in any event within 90 days of Completion) by the
        Sellers' Accountants of a profit and loss account and balance sheet for
        Permutit UK and a consolidated profit and loss account and consolidated
        balance sheet for Permutit Australia in each case for the financial year
        ended 31 March 1995 (the "Completion Accounts") and the parties shall
        disclose to and open for inspection by the Sellers' Accountants all
        information, documents and records in their possession or under their
        control reasonably requested by the Sellers' Accountants for that
        purpose. The costs of preparing the Completion Accounts shall be borne
        firstly by the relevant Company from the provision that will be made in
        the Completion Accounts to the extent that the work relates to the
        preparation of statutory accounts for the same period and half the
        remainder of the costs shall be borne by the Sellers and half by the
        Purchaser.
<PAGE>
 
                                       15

(B)     The Completion Accounts shall be prepared on the following bases:

        (i)     Proper provision shall be made and identified for all
                liabilities of the Group, including, without limitation:

                (a)     all accrued commissions payable to agents of the Group;

                (b)     all costs in respect of the redundancy of Alison
                        Anderson, if her employment with Permutit UK ends on or
                        before 31 April 1995;

                (c)     all costs to be borne by any Group Company in respect of
                        the redundancy of Mervin Cottie; and

                (d)     the vouchers purchased from Group Companies which may be
                        exchanged with Group Companies for resin regeneration.

        (ii)    All receivables and payables shall, save to the extent hedged,
                be revalued in accordance with Thames Water Plc Treasury Rates
                at the close of business on 31 March 1995.

        (iii)   The provision for bad debts shall be based on the knowledge of
                the Group Companies at the date the Completion Accounts are
                agreed and shall reflect not only the length of time the debts
                have been outstanding, but also any available information as to
                the reasons that debts are outstanding.

        (iv)    No account shall be taken of the intra group balance created
                pursuant to Clause 4(A)(ii) nor of any asset or liability dealt
                with pursuant to Clause 7(O);

        (v)     A provision of L32,750 shall be made in respect of remedial
                works relating to the asbestos at the Manchester Property;

        (vi)    Subject to sub-clause (B)(i) to (v), the Completion Accounts
                shall be prepared in accordance with the accounting policies,
                principles and practices adopted by the Companies in relation to
                the Accounts and the Management Accounts applied on a consistent
                basis and, to the extent that they are consistent with the above
                in the case of the accounts of Permutit UK:

                (a)     the Companies Acts.

                (b)     the Statements of Standard Accounting Practice issued by
                        the Accounting Standards Committee of the Consultative
                        Committee of Accountancy Bodies whether or not adopted
                        by the Accounting Standards Board;
<PAGE>
 
                                       16


                (c)     the Financial Reporting Standards issued by the
                        Accounting Standards Board of the Financial Reporting
                        Council;

                (d)     the guidance, rulings and consensus interpretations or
                        pronouncements issued by the Urgent Issues Task Force of
                        the Accounting Standards Board of the Financial
                        Reporting Council;

                (e)     the requirements of the Financial Reporting Review Panel
                        of the Financial Reporting Council;

                and in the case of the consolidated accounts of Permutit 
                Australia:

                (f)     have been prepared in accordance with accounting
                        standards, principles and practice generally accepted in
                        Australia;

                (g)     comply with the requirements of the Corporations Law and
                        Australian Accounting Standards applicable to Permutit
                        Australia and other applicable statutes and regulations.

(C)     A value of nil shall be attributed in the Completion Accounts to the
        shares in Permutit Egypt Limited held by Permutit UK as nominee.

(D)     Upon completion of the preparation of the Completion Accounts pursuant
        to clause 5(A) and (B) the Sellers' Accountants shall be instructed to
        send a copy of them to the Purchaser's Accountants and to disclose to
        the Purchaser's Accountants all information reasonably requested by the
        Purchaser's Accountants in relation thereto.

(E)     The Purchaser shall within 120 days of Completion raise any objections
        to the Completion Accounts. Objections may only be made on the basis
        that the Completion Accounts have not been prepared in accordance with
        the bases set out in clause 5(B) or that they do not properly reflect
        the value of the net assets of each Group Company as at the date of the
        Completion Accounts. Such objections shall be made in writing to the
        Sellers.

(F)     If any aspect of the Completion Accounts is objected to by the Purchaser
        and the parties are unable to resolve the dispute within 30 days of such
        notification, the dispute shall be referred for determination by an
        independent chartered accountant nominated by agreement between the
        Sellers and the Purchaser or, in the absence of such agreement within 7
        days, nominated at the request of either the Sellers or the Purchaser by
        the President for the time being of the Institute of Chartered
        Accountants in England and Wales. The determination of the said
        chartered
<PAGE>
 
                                       17

        accountant (who shall act as an expert and not an arbitrator)
        shall (in the absence of manifest error) be final and binding on the
        Sellers and the Purchaser. In the event that the Sellers and the
        Purchaser shall agree, or that the said independent chartered accountant
        shall determine, that the Completion Accounts should be adjusted, the
        same shall forthwith be so adjusted. The fees of the said chartered
        accountant and any costs related to his appointment shall be borne as he
        shall direct.

(G)     Upon agreement between the parties (or lack of any objection) as to the
        Completion Accounts or the determination of the independent chartered
        accountant, the Completion Accounts shall be used to establish the Net
        Asset Value of the Companies as at the date of the Completion Accounts.

(H)     All parties agree that the forecast margin bank figure at 31st March
        1995 is L942,000 and the actual margin bank figure at 31st March 1995 is
        L1,253,000. The amount by which the actual margin bank differs from the
        forecast margin bank, L311,000, shall be known as the margin bank
        differential (the "Margin Bank Differential"). Appropriate adjustment
        shall be made to the Margin Bank Differential to the extent that the
        method for calculating the actual margin bank at 31 March, 1995 differs
        from the methodology used in calculating the forecast margin bank at
        31st March, 1995 (prepared at 31st December, 1994).

(I)     In the event that, and only to the extent that Net Asset Value (plus
        Margin Bank Differential (as adjusted) if it is positive or less Margin
        Bank Differential (as adjusted) if it is negative) is less than
        L3,125,000 (being the forecast net asset value less L300,000) the
        Sellers shall pay to the Purchasers L1.00 for each L1.00 by which such
        amount is less than such figure. For the purpose of calculating the Net
        Asset Value and the Margin Bank Differential of Permutit Australia in
        sterling, the exchange rate shall be taken to be L1 = Australian dollars
        2.217. Such payment shall be made by banker's draft made payable to the
        Purchaser not more than 7 days after the agreement of the parties as to
        the Completion Accounts or the determination of the independent
        chartered accountant.

6.      SELLERS' WARRANTIES AND UNDERTAKINGS

(A)     Subject to clauses 8(A) and (B) (Purchaser's remedies and Seller's
        limitations on liability) each Seller warrants and represents in respect
        of the Company it is selling and any Subsidiary of that Company to the
        Purchaser that each of the Warranties is true and correct and not
        misleading in relation to the relevant Group Company at the date of this
        agreement.

(B)     Each of the Warranties shall be construed as a separate and independent
        warranty and (except where expressly provided to the
<PAGE>
 
                                       18

        contrary) shall not be limited or restricted by reference to or
        inference from the terms of any other Warranty.

(C)     TWPS agrees to indemnify and hold harmless each member of the Group from
        and against all claims, actions, proceedings, demands, liabilities,
        losses, damages, and costs and expenses reasonably incurred in respect
        of or arising out of any Pontyclun Claims or Asbestos Claims. None of
        the provisions of clause 8 or schedule 3 shall apply to this indemnity.

(D)     In relation to any claims by the Purchaser pursuant to clause 6(C) the
        Purchaser shall and shall procure that the relevant Group Company shall:

        (i)      notify TWPS in writing as soon as reasonably practicable after
                 any Pontyclun Claim or Asbestos Claim has been threatened or
                 made;

        (ii)     give TWPS on demand the full, unrestricted and exclusive right
                 to assume or to allow its insurers to assume the conduct of the
                 relevant Pontyclun Claim or Asbestos Claim in the name of the
                 relevant member of the Group subject to TWPS providing the
                 Purchaser as soon as reasonably practicable with details of any
                 action taken and providing the Purchaser and any relevant Group
                 Company with security to their reasonable satisfaction for any
                 costs and expenses which may be incurred by them in relation to
                 any action;

        (iii)   provide all records, information and other assistance reasonably
                requested by TWPS in relation to any Pontyclun Claim or Asbestos
                Claim; and

        (iv)    not make any admission or agree any settlement or purport to do
                either of the above in relation to any Pontyclun Claim or
                Asbestos Claim,

        Provided that, if TWPS fails to demand conduct of the relevant Pontyclun
        Claim or Asbestos Claim within one month of receiving a notice under
        paragraph (i) the relevant Group Company may require TWPS to assume
        conduct. If TWPS refuses to assume conduct within 7 days of being
        required to do so or if, having assumed conduct, TWPS subsequently
        abandons conduct of the relevant Pontyclun Claim or Asbestos Claim, the
        relevant Group Company may take any reasonable steps to settle the
        claim.

(E)     Except to the extent provided to the contrary if any Group Company, the
        Seller, any member of the Retained Group, or the Purchaser or any member
        of the Purchaser's Group suffers any loss ("Loss") in respect of which
        it is entitled to be indemnified or re-imbursed (the "Indemnity
        Payment") pursuant to any provision under this Agreement and the
        Indemnity Payment would be taken into account as a receipt in computing
        a Tax Liability of the
<PAGE>
 
                                       19

        recipient and the Loss would not be deductible in computing the Tax
        Liability, the Indemnity Payment will be increased to such amount as is
        necessary to ensure that the recipient is put in the same net of tax
        position as it would be in if the Loss was not deductible and the
        Indemnity Payment was not taxable in the recipient's hands.

(F)     TWPS agrees to indemnify and hold harmless the Purchaser from and
        against all claims, actions, proceedings, demands, liabilities, losses,
        damages and costs and expenses reasonably incurred by the Purchaser or
        any Group Company or any of its or their officers or employees in
        respect of or arising out of the termination within seven days of
        Completion of the contract of employment of Neil Edkins by Permutit UK
        or his loss of office or his employment or the holding of any office or
        any other matter whatsoever or howsoever arising (including, without
        limitation, any claim for a statutory redundancy payment, wrongful
        dismissal, unfair dismissal or otherwise at common law or under
        statute), which termination TWPS hereby agrees Permutit UK may effect at
        its own discretion at any time after the Completion Date.

(G)     To the extent that any such claim by Neil Edkins against Permutit UK as
        set out in Clause 6(F) is for an amount not exceeding L82,527, TWPS will
        pay Permutit UK such amount. If any such claim against Permutit UK
        exceeds that amount, then the Purchaser shall, and shall procure that
        Permutit UK shall:

        (i)     notify TWPS in writing as soon as reasonably practicable after
                any such claim has been threatened or made;

        (ii)    give TWPS on demand the full, unrestricted and exclusive right
                to assume or to allow its insurers to assume the conduct of the
                claim in the name of Permutit UK subject to TWPS providing the
                Purchaser as soon as reasonably practicable with details of any
                action taken and providing Permutit UK with security for its
                reasonable satisfaction for any costs and expenses which may be
                incurred by them in relation to any action;

        (iii)   provide all records, information and other assistance reasonably
                requested by TWPS in relation to the claim;

        (iv)    not make any admission or agree any settlement or purport to do
                any of the above in relation to any claim,

        Provided that if TWPS fails to demand conduct of the claim within one
        month of receiving notice under paragraph (i) Permutit UK may require
        TWPS to assume conduct. If TWPS refuses to assume conduct within 7 days
        of being so required to do so or if, having assumed conduct, TWPS
        subsequently abandons conduct of the claim, Permutit may take any
        reasonable steps to settle the claim.
<PAGE>
 
                                       20

(H)     Each of the Sellers hereby jointly and severally undertakes to the
        Purchaser that:

        (i)     it will within twenty-eight days of Completion assign or procure
                the relevant member of the Retained Group to assign to such
                member of the Group as shall be notified by the Purchaser such
                of the Intellectual Property as shall at Completion be shown on
                the schedule of registered Intellectual Property which is
                annexed to the Disclosure Letter not to be registered in the
                name of a member of the Group;

        (ii)    such assignment shall be in the form of the deed of assignment
                set out in schedule 15 or a form reasonably similar thereto;

        (iii)   it will pending such assignment hold or procure the relevant
                member of the Retained Group to hold such Intellectual Property
                on trust for the member of the Group notified by the Purchaser
                absolutely;

        (iv)    it will pending such assignment take no action and will procure
                the relevant member of the Retained Group to take no action
                whereby such Intellectual Property might cease to be valid and
                enforceable without the prior written consent of the Purchaser;

        (v)     it hereby grants or will procure the relevant member of the
                Retained Group to grant immediately to the member of the Group
                notified by the Purchaser an exclusive, irrevocable, royalty
                free licence to use such Intellectual Property;

        (vi)    it will as soon as reasonably practicable procure the
                registration of such licence with the relevant Intellectual
                Property registry (if such be a requirement of such registry and
                the Purchaser so requires);

        (vii)   it will be responsible for all fees and out of pocket expenses
                of whatsoever nature (excluding internal administrative costs)
                incurred by it, the relevant member of the Retained Group, the
                member of the Group notified by the Purchaser and the Purchaser
                in making and registering such licence and assignment;

        (viii)  it will immediately upon becoming aware of the same bring to the
                attention of the Purchaser:

                (a)     any claim of any third party that such Intellectual
                        Property is invalid;

                (b)     any claim that the use of such Intellectual Property
                        infringes any rights of any third party.
<PAGE>
 
                                       21

(I)     In the event of any claim being made or action brought arising out of
        the matters referred to in Clause 6(H)(viii)(a) or (b) then the Sellers
        and the Purchaser will within 10 (ten) Business Days of either of the
        Sellers becoming aware of any such claim or action use their reasonable
        endeavours to agree an appropriate course of action PROVIDED THAT the
        Purchaser may, if it considers it necessary to protect such Intellectual
        Property, take control of the conduct of any relevant litigation and of
        the settlement of any such claim or action but will inform the Sellers
        of the progress of any relevant litigation. The costs of any such action
        shall be borne by the Purchaser (without prejudice to any rights of the
        Purchaser in respect of any breach of any of the warranties in Schedule
        2). The Sellers shall not and shall procure that no member of the
        Retained Group shall make any admission that may be prejudicial to the
        Purchaser. The Sellers shall and shall procure that each member of the
        Retained Group shall (at its sole cost and expense) give all available
        assistance for the purpose of contesting or supporting any such claim or
        action. Any amounts recovered shall be for the account of the Purchaser.

(J)     There shall be excluded from Clause 6(H) the following trade marks:

                PERMAK
                TRIPOL.

7.      PURCHASER'S AND PURCHASER'S GUARANTOR'S WARRANTIES
        AND UNDERTAKINGS

(A)     Each of the Purchaser and the Purchaser's Guarantor represents and
        warrants to the Sellers that neither the execution of this agreement by
        it nor the consummation of the transaction as contemplated by this
        agreement will:

        (i)     result in a material breach of any provision of the memorandum
                or articles of association of the Purchaser or the Purchaser's
                Guarantor; or

        (ii)    result in a material breach of, or constitute a material default
                under, any instrument to which the Purchaser or the Purchaser's
                Guarantor is a party or by which the Purchaser or the
                Purchaser's Guarantor or any of its assets is bound; or

        (iii)   result in a breach of any order, judgment or decree of any court
                or governmental agency by which the Purchaser or the Purchaser's
                Guarantor or any of their respective assets is bound.  

(B)     The Purchaser undertakes to procure that the auditors of each Group
        Company at the time of Completion shall be retained as such
       
<PAGE>
 
                                       22

        by each Group Company until the Completion Accounts have been agreed
        between the parties.

(C)     In the event that at any time after the date hereof, the Sellers shall
        wish to take out insurance against liability under any relevant
        provision of this agreement, the Purchaser on being indemnified to its
        reasonable satisfaction for any costs incurred undertakes to provide
        such information as the prospective insurer may reasonably require.

(D)     The Purchaser undertakes to indemnify PWT against all actions, costs,
        claims or demands or other liabilities incurred by PWT as a result of
        PWT being jointly and severally liable for the debts of Permutit
        Australia as a result of having been a sole shareholder in Permutit
        Australia.

(E)     The Purchaser undertakes that, to the extent any shares in Permutit
        Egypt Limited are owned as nominee by Permutit UK at Completion, it will
        procure that such shares are transferred to the Seller for nil as soon
        as practically possible after Completion. The Sellers will reimburse
        Permutit Egypt Limited or the Purchaser for all costs properly incurred
        by either of them in connection with the transfer.

(F)     The Purchaser and the Purchaser's Guarantor represent and warrant that
        do not have actual knowledge of any breach of Warranty.
 
(G)     The Purchaser and the Purchaser's Guarantor covenant to use all
        reasonable endeavours (including, without limitation, the giving of
        parent company guarantees to the relevant third party), following
        Completion, to secure the release of the Sellers or any member of the
        Retained Group from the guarantees and bonds set out in part 1 of
        schedule 12 and covenant to indemnify the Sellers, for itself and as
        trustee for any member of the Retained Group, against all actions,
        costs, claims and demands or other liabilities incurred by the Sellers
        or any member of the Retained Group in relation to or arising out of
        such guarantees and bonds.

(H)     The Purchaser and the Purchaser's Guarantor hereby agree to indemnify
        the Sellers for themselves and as trustees for any member of the
        Retained Group against all actions, costs, claims and demands or other
        liabilities incurred by the Sellers or any member of the Retained Group
        in relation to or arising out of the guarantees and bonds set out in
        part 2 of schedule 12.

(I)     In relation to any claims by the Sellers pursuant to clauses 7(D), 7(G)
        or 7(H), the relevant Seller shall and shall procure that the relevant
        member of the Retained Group shall:

        (i)     notify the Purchaser in writing as soon as reasonably
                practicable after it becomes aware that any such loss or
<PAGE>
 
                                       23

                liability has been incurred or any claim under such a bond or
                guarantee has been threatened or made;

        (ii)    give the Purchaser on demand the full, unrestricted and
                exclusive right to assume or to allow its insurers to assume the
                conduct of the relevant claim subject to the Purchaser providing
                the Sellers as soon as reasonably practicable with details of
                any action taken and providing the relevant Seller and any
                relevant member of the Retained Group with security to their
                reasonable satisfaction for any costs and expenses which may be
                incurred by them in relation to any action;

        (iii)   provide all records, information and other assistance reasonably
                requested by the Purchaser in relation to any such claim; and 

        (iv)    not make any admission or agree any settlement or purport to do
                either of the above in relation to any such claim,

        Provided that if the Purchaser fails to demand conduct of the relevant
        claim within one month of receiving a notice under paragraph (i) the
        Seller may require the Purchaser to assume conduct. If the Purchaser
        refuses to assume conduct within seven days of being required to do so,
        or if having assumed conduct, the Purchaser subsequently abandons
        conduct of the relevant claim, the Sellers or the relevant member of the
        Retained Group may take any reasonable steps to settle the claim.

(J)     In relation to bonds or guarantees given by the Sellers or any member of
        the Retained Group, which will continue after Completion, on contracts
        entered into by any Group Company as set out in part 3 of schedule 12,
        the Purchaser and the Purchaser's Guarantor covenant to use their
        reasonable endeavours to ensure:

        (i)     the performance by the Group Companies of all works reasonably
                necessary to remedy any breach of warranty under such contracts
                other than the payment of money;

        (ii)    the payment by the Group Companies of all ordinary course fees,
                charges and expenses incurred in maintaining such bonds; and

        (iii)   the return to the Sellers of all such bonds forthwith upon their
                expiry.

(K)     To the extent that it transpires that any bonds or guarantees listed in
        Parts 1 and 2 of Schedule 12 are in respect of contracts which have been
        handed over to clients, such bonds and guarantees will be treated by all
        parties as if they were in part 3 of schedule 12.
<PAGE>
 
                                       24

(L)     The Purchaser undertakes to the Sellers (as trustees on behalf of the
        employees of all the Group Companies at the date of Completion) to
        procure that all the Group Companies comply with the terms of the
        employees' enhanced redundancy terms set out in Schedule 10 of this
        agreement.

(M)     The Purchaser, as a result of the Sellers agreeing to continue, until
        1st October, 1995, insuring the employees of the Group Companies in
        respect of permanent health insurance, BUPA and death in service
        insurance to the extent they are insured at Completion, undertakes to
        procure that the relevant Group Company reimburses (or failing which,
        itself to pay) the Sellers in respect of all costs, expenses and
        liabilities reasonably incurred as a result of doing so. The costs of
        such insurances will be no more than would be charged to any member of
        the Retained Group in like circumstances.

(N)     The Purchaser undertakes to procure that the relevant Group Company
        shall pay (or failing which, itself to pay) to the Sellers or the
        relevant member of the Retained Group a commission of 1% per annum of
        the value of each guarantee given by any member of the Retained Group
        prior to the date of this agreement in respect of obligations of a Group
        Company which are to remain in force after Completion.

(O)     The Purchaser and the Sellers shall within 21 days of Completion agree a
        bank reconciliation in respect of the bank accounts of all Group
        Companies as at Completion. If such reconciliation is not agreed, any
        dispute shall be resolved in the terms, mutatis mutandis, of Clause
        5(F). A sum equal to any net cash shall be paid by the Purchaser to the
        Sellers and any net indebtedness shall be paid by the Sellers to the
        Purchaser.

(P)     The Purchaser undertakes to procure that, in the circumstances set out
        in Clause 10(A)(iii)(a), the relevant Group Company shall make available
        to the Sellers such moulds and patterns necessary for the production of
        such items to the extent these are in the possession of the relevant
        Group Company and provide such other assistance as the Sellers may
        reasonably require, such reasonable costs incurred by the relevant Group
        Company in so doing to be paid by the Seller.

8.      PURCHASER'S REMEDIES AND SELLERS' LIMITATIONS ON LIABILITY

(A)     Subject to sub-clause (B) and to the limitations set out in schedule 3
        (Sellers' limitations on liability), the Purchaser shall be entitled to
        claim after Completion that any of the Warranties has been breached and
        (in accordance with clause 14 (Effect of Completion)) Completion shall
        not in any way constitute a waiver of any of the Purchaser's rights. The
        Purchaser's rights and remedies shall not be affected by any
<PAGE>
 
                                       25

        waiver except a duly authorised written waiver or release by the
        Purchaser.

(B)     The Purchaser shall not be entitled to claim that any fact causes any of
        the Warranties to be breached if it has been fairly disclosed by the
        Disclosure Letter or this agreement. The Warranties shall be subject to
        no other qualifications whatsoever save for any qualifications arising
        by operation of statute, common law or equity.

(C)     No liability shall attach to the Sellers in respect of claims under the
        Warranties or the Tax Covenant, as the case may be, if and to the extent
        that the limitations referred to in sub-clause 8(A) above apply.

(D)     The Seller and the Purchaser agree that, subject to the provisions of
        this clause 8, if there is a breach of any of the Warranties in respect
        of any Group Company, damages shall be calculated such that the Sellers
        shall pay in cash to the Purchaser a sum equal to the aggregate of:

        (i)     the amount equal to the amount which, if the amount were payable
                to the relevant Group Company, the relevant Group Company would
                need to receive to put that Group Company into the financial
                position which would have existed had there been no breach of
                the Warranty in question Provided always that in determining
                such amount common law rules as to foreseeability and remoteness
                of loss shall apply; and

        (ii)    all reasonable out of pocket costs suffered or incurred by the
                Purchaser or such Group Company, as a result of or in connection
                with such breach of Warranty.

        Notwithstanding the foregoing, the Purchaser shall be obliged to
        mitigate any loss as if the common law rules applied unamended.

9.      GUARANTEES 

(A)             (i)     The Sellers' Guarantor hereby guarantees to the
                        Purchaser the due performance by the Sellers
                        (notwithstanding any legal limitation on or incapacity
                        of or other circumstances relating to the Sellers) of
                        the Warranties, undertakings, agreements and other
                        obligations on the part of the Sellers hereunder and
                        under the Tax Covenant and the Sellers' Guarantor hereby
                        covenants with the Purchaser that if and whenever the
                        Sellers shall make any default in any such Warranty,
                        undertaking, agreement or other obligation each will
                        indemnify the Purchaser against all losses, damages,
                        costs and expenses which may be incurred by the
                        Purchaser by reason of such default.
<PAGE>
 
                                       26

        (ii)    The Sellers' Guarantor waives any rights which it might have to
                require the Purchaser to proceed first against or claim payment
                from the Sellers to the intent that as between the Purchaser and
                the Sellers' Guarantor, the Sellers' Guarantor shall be deemed
                to be liable as a principal as if it had entered into such
                Warranties, undertakings, agreements and other obligations
                jointly and severally with the Sellers.

        (iii)   The Sellers' Guarantor acknowledges that it shall not be
                released by time or indulgence being given to or any
                arrangements or alterations of terms being made with the Sellers
                or by any release or dealing by the Purchaser or by the
                invalidity of any such Warranty, undertaking, agreement or other
                obligation.

        (iv)    The Sellers' Guarantor shall not, after any claim has been made
                pursuant to its guarantee and indemnity hereunder, claim from
                the Sellers any sums which may be owing to it from the Sellers
                or have the benefit of any set-off or counter-claim or proof
                against or dividend, composition or payment by the Sellers until
                all sums owing to the Purchaser in respect hereof shall have
                been paid in full.

        (v)     This guarantee and indemnity shall be a continuing and
                irrevocable guarantee and indemnity.

        (vi)    The Seller's Guarantor hereby guarantees to the Purchaser the
                due performance by PWT Projects Limited of its obligations under
                the Egypt Side Letter and the Egypt Trade Mark User Agreement
                and of the Permutit Company of South Africa Pty under the South
                Africa Trade Mark User Agreement on the terms, mutatis mutandis,
                of (i) to (v) above.

(B)     In consideration of the Sellers entering into the agreement, the
        Purchaser's Guarantor hereby guarantees to the Sellers for themselves
        and as trustee for PWT Projects the due performance by the Purchaser of
        all its obligations hereunder and under the Egypt Side Letter on the
        terms, mutatis mutandis of Clause 9(A)(i) to (v).

10.     RESTRICTIONS ON SELLERS' BUSINESS ACTIVITIES

(A)     The Sellers undertake that neither they nor any member of the Retained
        Group will do any of the following things without the consent of the
        Purchaser:

        (i)     neither pending nor within two years after the date of
                Completion, be engaged or (save as the holder of or being
                interested in shares in a listed company which confer not more
                than three per cent. of the votes which could normally be cast
                at a general meeting of the company) directly or
               
<PAGE>
 
                                       27

                indirectly interested in carrying on any business which directly
                competes with the Business of the Group;

        (ii)    within two years after the date of Completion, attempt to
                discourage any person, firm or company from dealing with any
                Group Company in respect of the Business of the Group;

        (iii)   use any information which is Confidential Business Information
                for so long as that information remains Confidential Business
                Information;
                
                Provided that:

                (a)     should the Companies stop selling to the Retained group
                        the items set out in schedule 9 or if they should stop
                        selling such items to any member of the Retained Group
                        on arm's length terms, the Sellers shall be entitled to
                        retain and pass on to third parties know-how relating to
                        the production of such items so that such third party
                        may produce such items for the purchase by, amongst
                        others, the Sellers or any member of the Retained Group;

                (b)     the Sellers and any member of the Retained Group shall
                        be entitled to disclose information which is
                        Confidential Business Information to its professional
                        advisers;

                (c)     this sub-clause shall not apply in respect of any
                        Confidential Business Information which is in or becomes
                        part of the public domain, other than through a breach
                        of the obligations of confidentiality set out in this
                        agreement;

                (d)     this sub-clause shall not apply to the extent that the
                        Sellers and any member of the Retained Group are
                        required to disclose such Confidential Business
                        Information by any applicable law, regulatory or
                        governmental order, decree, regulation, licence or rule
                        or pursuant to the regulations of the Panel or any
                        recognised securities exchange whether or not the
                        requirement has the force of law;

        (iv)    at any time after the date of Completion maliciously do or say
                anything harmful to the reputation of the Business of the Group
                or which leads or may lead any person, firm or company to cease
                to do business of the type carried on by the Group at the date
                of Completion with any Group Company on substantially equivalent
                terms to those previously offered or not to engage in such
                business with any Group Company;
<PAGE>
 
                                       28


        (v)     neither pending nor within l year after Completion, solicit or
                entice away from the employment of any of the Group Companies
                any person at present an employee of any of the Group Companies
                EXCEPT for those who answer a public advertisement or those who
                are approached when they are no longer employed by any of the
                Group Companies.

(B)     The Sellers undertake that no Competitive Business as defined in sub-
        clause (D) will (without the consent of the Purchaser), neither pending
        nor within two years after the date of Completion, solicit for the
        purposes of any business which competes with the Business of the Group,
        the custom or business of any person from whom any of the Group
        Companies have within one year before the date of Completion solicited
        or received an order for goods or services and who has for that purpose
        had contact with any of the Sellers.

(C)     Each undertaking contained in this clause shall be construed as a
        separate undertaking and if one or more of the undertakings is held to
        be against the public interest or unlawful or in any way an unreasonable
        restraint of trade, the remaining undertakings shall continue to bind
        the Sellers.

(D)     Nothing in clause 10(A)(i) (Restrictions on Sellers' business
        activities) shall prevent the Sellers or any of their subsidiaries
        (other than a member of the Group) from:

        (i)     carrying on any of the Permitted Businesses subject to subclause
                (F); or

        (ii)    acquiring another company, group of companies, business,
                undertaking or entity which has, as a part of its business, a
                business or businesses which are competitive with the Business
                of the Group (a "Competitive Business"), provided that the sole
                or main purpose of the acquisition is not acquiring a business
                which so competes, the Competitive Business is not a material
                part of the business or businesses of the company, group of
                companies, business, undertaking or entity to be acquired and
                within 45 days of such acquisition the Sellers offer to sell the
                Competitive Business to the Purchaser at market value.

(E)     For the purpose of sub-clause (D), "Permitted Businesses" means the
        businesses carried on by Flocovery Systems Inc., Houseman N.V., Houseman
        B.V., the Permutit Company of South Africa (Pty) and Home
        Waterbehandeling B.V. in each case as carried on at the date of
        Completion.

(F)     The Sellers undertake that for a period of two years after the date of
        Completion, none of the Permitted Business shall, whilst still part of
        the Retained Group, carry on any direct business in the United Kingdom
        where such business competes with the Business
       
<PAGE>
 
                                       29

        of the Group. The Seller shall inform the Purchaser if they intend to
        dispose of any such business.

11.     ISLEWORTH UNDERLEASE AND ASSIGNMENT OF LEASE OF PROPERTY AT 
        DONCASTER

(A)     In this clause:-

        (i)     "The Doncaster Lease" means the lease dated 15th November l988
                made between Jack Lunn (Properties) Limited (1) and Permutit UK
                (2) whereby the premises known as 7 Trafford Court were demised
                to Permutit UK;

        (ii)    "The Doncaster Agreement" means the agreement of the date hereof
                made between Permutit UK (1) TWPS (2) and The Sellers Guarantor
                (3) under which the Doncaster Lease is to be assigned to TWPS
                (subject to Landlord's consent); and

        (iii)   "The Doncaster Property" means the premises known as 7 Trafford
                Court, Doncaster comprised in the Doncaster Lease.

(B)     From the date of this Agreement the Sellers shall pay the rents and all
        other sums due under the Doncaster Lease and will observe and perform
        the covenants and obligations on the part of the lessee and will keep
        the Purchaser and Permutit UK indemnified against all costs, claims,
        proceedings, losses, damages, expenses liabilities and demands arising
        under the Doncaster Lease or otherwise in respect of the Doncaster
        Property.

        None of the provisions of clause 8 or schedule 3 shall apply to this
        sub-clause.

(C)     The Sellers will request the landlord to release Permutit UK from its
        liability under the Doncaster Lease following the assignment of the
        Doncaster Lease pursuant to the Doncaster Agreement. The Sellers will
        use all reasonable endeavours to obtain the release (but without being
        under any obligation to make any payment for the release) including if
        necessary procuring that the Sellers' Guarantor guarantees the
        obligations of TWPS following the assignment of the Doncaster Lease to
        TWPS. If the landlord so releases Permutit UK, the indemnity set out in
        (B) above shall cease, with effect from the date of the release (but
        without prejudice to any claims arising before the date of the release).

        The Sellers undertake to indemnify Permutit UK against any costs,
        claims, proceedings, losses, damages, expenses, liabilities and demands
        arising under the lease dated 24th June, l966 made between Nonador
        Properties Limited (1) and Permutit UK (2) as varied by the Annexure
        Lease dated 3rd July 1972 made between Liverpool Victoria Trustees
        Limited (1) Liverpool Victoria Friendly Society (2) and Permutit UK (3)
        whereby the premises known as 632/652 London Road, Hounslow, Middlesex,
        were demised
<PAGE>
 
                                       30

        to Permutit UK other than any arising out of the breach of its
        obligations contained in an agreement of the date hereof made between
        PWT Projects Limited (1) and Permutit UK (2). None of the provisions of
        clause 8 or schedule 3 shall apply to this indemnity.

12.     PENSIONS

        Each of the parties shall comply with the requirements pertaining to
that party set out in schedule 7 (Pensions).

13.     INTELLECTUAL PROPERTY

(A)     The Purchaser acknowledges that the Permutit Brand Name is presently
        used in relation to the Named Businesses.  

(B)     Immediately on Completion the Sellers shall procure the Permutit Company
        of South Africa (Pty) to surrender immediately all licences which it
        holds to use the name "Permutit".

(C)     The Purchaser agrees that a duly executed licence to use the Permutit
        Brand name in the forms attached to this agreement as Parts A and B of
        schedule 14 shall be granted to PWT Projects Limited and the Permutit
        Company of South Africa (Pty) respectively on Completion.

(D)     Following the expiry of such licences, the Sellers shall procure that
        neither PWT Projects Limited nor the Permutit Company of South Africa
        (Pty) as the case may be shall use the Permutit Brand Name.

(E)     Subject to Clause 13(C), the Sellers shall procure that from Completion
        no member of the Retained Group shall use the Permutit Brand Name.

(F)     For the purpose of this clause 13 "Named Businesses" shall mean the
        business carried on by Permutit Egypt Limited and the Permutit Company
        of South Africa (Pty) as at the date of this Agreement.

(G)     The Sellers undertake to procure that any Items which are in the
        possession of any Retained Companies shall be made available at no cost
        to the Purchaser or the relevant Group Company upon request by the
        Purchaser or the relevant Group Company, provided for the avoidance of
        doubt that the Sellers shall not be obliged to procure the making
        available of any Item which is not in the possession of any Retained
        Companies (without prejudice to any rights of the Purchaser under the
        Warranties in schedule 2). The Sellers shall grant or procure the grant
        to the Purchaser or the relevant Group Company of an irrevocable, non-
        exclusive and royalty-free licence to use any Items which are made
        available under this clause 13(G).
<PAGE>
 
                                       31


(H)     The Sellers undertake to procure that on demand from any Group Company,
        such company is granted a licence in the form in schedule 13 to use the
        trade mark "TRIPOL". The Purchaser undertakes to procure that on demand
        from any of the Retained Companies, such company is granted a licence in
        the form in schedule 13 to use the trade marks "VARIVOID" and/or
        "HIPOL".

14.     EFFECT OF COMPLETION

(A)     Any provision of this agreement and any other documents referred to in
        it, which has not been performed at or before Completion, or which is
        capable of being performed after but which has not been performed at
        Completion, and all Warranties and other undertakings contained in or
        entered into pursuant to this agreement shall remain in full force and
        effect notwithstanding Completion.

(B)     After Completion the Sellers shall do and execute all other necessary
        acts, deeds, documents and things within their power for effectively
        vesting the Shares in the Purchaser or its nominees and pending such
        vesting, the Sellers shall as from Completion hold the Shares in trust
        for the Purchaser.

(C)     After completion at the request of the Purchaser the Sellers or any of
        them shall execute as a deed a power of attorney in favour of the
        Purchaser or such person as may be nominated by the Purchaser generally
        in respect of the Shares and in particular to enable the Purchaser (or
        its nominee) to attend and vote at general meetings of the Companies.

15.     REMEDIES AND WAIVERS

(A)     Without prejudice to schedule 3 (Sellers' limitations on liability), no
        delay or omission on the part of any party to this agreement in
        exercising any right, power or remedy provided by law or under this
        agreement or any other documents referred to in it shall:

        (i)     impair such right, power or remedy; or

        (ii)    operate as a waiver thereof.

(B)     The single or partial exercise of any right, power or remedy provided by
        law or under this agreement shall not preclude any other or further
        exercise thereof or the exercise of any other right, power or remedy.

(C)     The rights, powers and remedies provided in this agreement are
        cumulative and not exclusive of any rights, powers and remedies provided
        by law unless stated expressly.
<PAGE>
 
                                       32

16.     ASSIGNMENT

(A)     This agreement and the benefits and obligations under it and any part of
        it shall not be assignable except that the Purchaser may, upon giving
        written notice to the Sellers, assign the benefit (but not the burden)
        of this agreement to a member of the Purchaser's Group provided that any
        such assignee remains a member of the Purchaser's Group and provided
        further that before such assignee ceases to be a member of the
        Purchaser's Group, the Purchaser will procure that the benefit of this
        agreement is assigned to the Purchaser or (upon giving further written
        notice to the Sellers) to another company within the Purchaser's Group
        (any such further assignment to be subject to the same conditions as
        aforesaid).

 17.    ENTIRE AGREEMENT

(A)     This agreement, the Tax Covenant and the Disclosure Letter and any other
        documents referred to in this agreement constitute the entire agreement
        between the parties relating to the sale and purchase of the Shares and,
        save if and only to the extent repeated in any of the documents referred
        to, supersedes and extinguishes any prior drafts, agreements,
        undertakings, representations, warranties and arrangements of any nature
        whatsoever, whether or not in writing, relating thereto.

(B)     Each party acknowledges that in entering into this agreement, the Tax
        Covenant and the Disclosure Letter and any other documents referred to
        in this agreement on the terms set out therein, it is not relying upon
        any representation, warranty, promise or assurance made or given by any
        other party or any other person, whether or not in writing, at any time
        before the execution of this agreement which is not expressly set out
        herein.

(C)     Neither of the parties shall have any right of action against the other
        party arising out of or in connection with any prior agreement,
        undertaking, representation, warranty, promise, assurance or arrangement
        referred to in sub-clause (A) or (B) above (except in the case of fraud)

(D)     This agreement may only be varied in writing signed by each of the
        parties.

18.     NOTICES

(A)     Any notice or other communication given or made under or in connection
        with the matters contemplated by this agreement shall be in writing
        (other than writing on the screen of a visual display unit or other
        similar device which shall not be treated as writing for the purposes of
        this clause) and shall be deemed effective on actual receipt by the
        addressee.
<PAGE>
 
                                       33

(B)     The relevant addressee, address and facsimile number of each party for
        the purposes of this agreement, subject to sub-clause (C), are:

        Name of party                  Address                  Facsimile No.

        Thames Water Products          14 Cavendish Place       (0171) 436 6753
        & Services Limited             London W1M ONU                

        For the attention
        of: the Company Secretary

        PWT Overseas Limited           14 Cavendish Place       (0171) 436 6753
                                       London W1M 0NU

        For the attention
        of: the Company Secretary

        Thames Water Plc               14 Cavendish Place       (0171) 436 6753
                                       London W1M 0NU
        For the attention
        of: the Company Secretary

        Ionpure Technologies           Harforde Court           (01992) 501528
        Limited                        Foxholes Business
                                       Park,
                                       John Tate Road
                                       Hertford SG13 7NW

        For the attention
        of: the Company Secretary

        United States Filter           73-710 Fred Waring       001 619 341 9368
        Corporation                    Drive, Suite 222,
                                       Palm Desert, 
                                       California 92260

        For the attention
        of: Chief Financial Officer


(C)     Either party may notify the other party to this agreement of a change to
        its name, relevant addressee, address, or facsimile number for the
        purposes of sub-clause (B)

19.     ANNOUNCEMENTS

(A)     Subject to sub-clause (B), no public announcement concerning the sale
        and purchase of the Shares or any ancillary matter shall be made by
        either party without the prior written approval of the other such
        approval not to be unreasonably withheld or delayed.
<PAGE>
 
                                       34


(B)     Either party may make a public announcement concerning the sale and
        purchase of the Shares or any ancillary matter if required by:

        (i)     the law of any relevant jurisdiction;

        (ii)    any securities exchange or regulatory or governmental body to
                which that party is subject or submits, wherever situated,
                including (without limitation) the London Stock Exchange or the
                Panel whether or not the requirement has the force of law,

        in which case the party concerned shall take all such steps as may be
        reasonable and practicable in the circumstances to agree the contents of
        such announcement with the other parties before making such announcement
        PROVIDED THAT, in any event, any such announcement shall be made only
        after notice to the other party.

20.     CONFIDENTIALITY

(A)     Subject to sub-clause (B), the parties shall treat as strictly
        confidential all information received or obtained as a result of
        entering into or performing this agreement which relates to the
        negotiations relating to this agreement.

(B)     Any party may disclose information which would otherwise be confidential
        if and to the extent:

        (i)     required by the law of any relevant jurisdiction;

        (ii)    required by any securities exchange or regulatory or
                governmental body to which any party is subject or submits,
                wherever situated, including (without limitation) the London
                Stock Exchange or the Panel, whether or not the requirement for
                information has the force of law;

        (iii)   required to vest the full benefit of this agreement in any
                party;

        (iv)    it is disclosed to the professional advisers, auditors and
                bankers of each party;

        (v)     the information has come into the public domain through no fault
                of that party; or

        (vi)    the other parties have given prior written approval to the
                disclosure, such approval not to be unreasonably withheld or
                delayed,

        PROVIDED THAT any such information disclosed pursuant to paragraphs (i)
        or (ii) shall be disclosed only after notice to the other parties.
<PAGE>
 
                                       35

(C)     The restrictions contained in this clause 20 (Confidentiality) shall
        continue to apply after any termination of this agreement without limit
        in time.

21.     RESTRICTIVE TRADE PRACTICES ACT 1976

        If there is any provision of this agreement, or of any agreement or
arrangement of which this agreement forms part, which causes or would cause
this agreement or that agreement or arrangement to be subject to registration
under the RTPA, then that provision shall not take effect until the day after
particulars of such agreement or arrangement (as the case may be) have been
furnished to the Director General of Fair Trading pursuant to section 24 RTPA
1976.

22.     COSTS AND EXPENSES

        Save as otherwise stated in any other provision of this agreement (and
for stamp duty or any transfer tax which shall be borne by the Purchaser), each
party shall pay its own costs and expenses in relation to the negotiations
leading up to the sale and purchase of the Shares and to the preparation,
execution and carrying into effect of this agreement and all other documents
referred to in it.

23.     COUNTERPARTS

(A)     This agreement may be executed in any number of counterparts, and by the
        parties on separate counterparts, but shall not be effective until each
        party has executed at least one counterpart.

(B)     Each counterpart shall constitute an original of this agreement, but all
        the counterparts shall together constitute but one and the same
        instrument.

24.     TIME OF ESSENCE

        Time is only of the essence in respect of clause 4 (Completion) of this
agreement.

25.     INVALIDITY

        If at any time any provision of this agreement is or becomes illegal,
invalid or unenforceable in any respect under the law of any jurisdiction, that
shall not affect or impair:

(A)     the legality, validity or enforceability in that jurisdiction of any
        other provision of this agreement; or

(B)     the legality, validity or enforceability under the law of any other
        jurisdiction of that or any other provision of this agreement.
<PAGE>
 
                                       36

26.     LANGUAGE

        Each notice, demand, request, statement, instrument, certificate, or
other communication given, delivered or made by one party to another under or in
connection with this agreement shall be in English.

27.     CHOICE OF GOVERNING LAW

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

28.     JURISDICTION

        The parties to this agreement irrevocably agree that the courts of
England are to have jurisdiction to settle any disputes which may arise out of
or in connection with this agreement and that accordingly any Proceedings may be
brought in such courts. Subject and without prejudice to the provisions of
article 17 of the Convention on jurisdiction and the enforcement of judgments in
civil and commercial matters signed in Brussels in 1968 and article 17 of the
Convention on jurisdiction and the enforcement of judgments in civil and
commercial matters opened for signature at Lugano in 1988, nothing contained in
this clause shall limit the right of any party to take Proceedings against any
other party in any other court of competent jurisdiction, nor shall the taking
of Proceedings in one or more jurisdictions preclude the taking of Proceedings
in any other jurisdiction, whether concurrently or not, to the extent permitted
by the law of such other jurisdiction. It is acknowledged that this clause is
not concluded for the benefit of only one party to this agreement.

29.     AGENT FOR SERVICE

(A)     The Purchaser's Guarantor irrevocably agrees that any Service Document
        may be sufficiently and effectively served on it in connection with
        Proceedings in England and Wales by service on its agent, the Purchaser,
        if no replacement agent has been appointed and notified to the Sellers
        pursuant to sub-clause (D), or on the replacement agent if one has been
        appointed and notified to the Sellers.

(B)     Any Service Document served pursuant to this clause shall be marked for
        the attention of:-

        (i)     the Company Secretary, Ionpure Technologies Limited, Harforde
                Court, Foxholes Business Park, John Tate Road, Hertford SG13 7NW
                or such other address within England or Wales as may be notified
                to the Sellers by the Purchaser's Guarantor; or
<PAGE>
 
                                       37

        (ii)    such other person as is appointed as agent for service pursuant
                to sub-clause (D) at the address notified pursuant to sub-clause
                (D).

(C)     Any document addressed in accordance with sub-clause (B) shall be deemed
        to have been duly served on actual receipt by the addressee.

(D)     If the agent referred to in sub-clause (A) (or any replacement agent
        appointed pursuant to this sub-clause) at any time ceases for any reason
        to act as such, the Purchaser's Guarantor shall appoint a replacement
        agent to accept service having an address for service in England or
        Wales and shall notify the Sellers of the name and address of the
        replacement agent; failing such appointment and notification, the
        Sellers shall be entitled by notice to the Purchaser's Guarantor to
        appoint such a replacement agent to act on behalf of the Purchaser's
        Guarantor. If the Sellers appoint such a replacement, the Purchaser's
        Guarantor may remove such a replacement agent by appointing a further
        replacement and notifying the Sellers of the name and address of such
        replacement agent.

(E)     A copy of any Service Document served on an agent pursuant to this
        clause shall be sent by post to the Purchaser's Guarantor at its address
        for the time being for the service of notices and other communications
        under clause 18 (Notices), but no failure or delay in so doing shall
        prejudice the effectiveness of service of the Service Document in
        accordance with the provisions of sub-clause (A).

(F)     "Service Document" means a writ, summons, order, judgment or other
        document relating to or in connection with any Proceedings.
<PAGE>
 
                                       38



                                  SCHEDULE 1
                                  ----------

                   (Completion arrangements referred to in 
                            clause 4 (Completion))

                                    Part A

        At Completion the Sellers shall:

        (i)     deliver to the Purchaser or the Purchaser's Solicitors duly
                executed transfers in respect of the Shares in favour of the
                Purchaser or such person as the Purchaser may nominate and share
                certificates for the Shares in the name of the relevant
                transferors and any power of attorney under which any transfer
                is executed on behalf of the Seller or nominee;

        (ii)    procure that the Tax Covenant is executed and delivered to the
                Purchaser by the Sellers and the Sellers' Guarantor;

        (iii)   deliver to the Purchaser the powers of attorney referred to in
                clause 14(C);

        (iv)    deliver to the Purchaser's Solicitors such of the following as
                the Purchaser may require, insofar as they are not held by or to
                the order of any member of the Group:

                (a)     the statutory books (which shall be written up to but
                        not including the date of Completion), the certificate
                        of incorporation (and any certificate of incorporation
                        on change of name), common seal (if any) and all Books
                        and Records and Business Information;

                (b)     a copy of the minutes of duly held meetings of the
                        directors of the Sellers and the Sellers' Guarantor
                        authorising the execution by the Sellers and the
                        Sellers' Guarantor of this agreement and the Tax
                        Covenant (such copy minutes being certified as correct
                        by the secretary or a director of the relevant Seller or
                        the Sellers' Guarantor).

                (c)     cheque books in respect of all bank accounts operated by
                        the Companies and the Subsidiaries together with bank
                        statements drawn up to the day preceding Completion
                        relating to such accounts.

                (d)     certificates for all shares in the Subsidiary and duly
                        executed transfers in favour of the Purchaser or as it
                        shall direct (to be delivered in the same manner as the
                        Shares) of all of such shares not registered in the name
                        of Permutit Australia together with a deed of
<PAGE>
 
                                       39

                        waiver of its pre-emption rights in respect of any
                        shares not so registered; and

                (e)     an original letter from National Westminster Bank plc
                        dated 30th March, 1995 releasing Permutit UK from the
                        composite accounting system agreement and deed of
                        guarantee dated 5th May, 1994.

        (v)     procure that those persons whom the Purchaser has in writing on
                the day of Completion identified resign from their offices as
                director or secretary, as the case may be, and relinquish any
                rights or claims which they may have under any contract of
                employment with any member of the Group or under any statutory
                provision or otherwise including any right to damages for
                wrongful dismissal, redundancy payment or compensation for loss
                of office or unfair dismissal, such resignations, in agreed
                terms, to be tendered at the board meeting referred to in
                paragraph (vi) of this schedule 1;

        (vi)    procure that a board meeting of each Group Company be held at
                which:

                (a)     (in the case of the Companies) it shall be resolved that
                        each of the transfers relating to the Shares shall be
                        approved for registration and (subject only to the
                        transfers being duly stamped) each transferee registered
                        as the holder of the Shares concerned in the register of
                        members;

                (b)     (in the case of the Subsidiary) it shall be resolved
                        that any shares in the Subsidiary held by a nominee
                        shareholder are transferred to the Purchaser or its
                        nominee and it shall be resolved that such transfers
                        shall be approved for registration and (subject only to
                        the transfers being duly stamped) the Purchaser or its
                        nominee registered as the holder of such shares in the
                        Register of Members;

                (c)     each of the persons nominated by the Purchaser shall be
                        appointed directors and/or secretary, as the Purchaser
                        shall direct, such appointments to take effect on the
                        date of Completion;

                (d)     the resignations of the directors and secretary referred
                        to in paragraph (iv) above shall be tendered and
                        accepted so as to take effect at the close of the
                        meeting and each of the persons tendering his
                        resignation shall deliver to the relevant Company or
                        Subsidiary an acknowledgement executed as a deed that he
                        has no claim against that company for breach of
                        contract, compensation for loss of office, redundancy or
                        unfair dismissal or on any other account whatsoever
<PAGE>
 
                                       40

                        and that no agreement or arrangement is outstanding
                        under which that company has or could have any
                        obligation to him;

                (e)     all existing instructions to banks shall be revoked and
                        new instructions to such banks in such form as the
                        Purchaser may direct shall be approved, provided the
                        Purchaser has supplied such new instructions to the
                        Sellers;

                (f)     the situation of the registered office shall be changed
                        to such address as the Purchaser may nominate and
                        (subject to the provisions of the Companies Acts and in
                        the case of Permutit New Zealand, the Financial
                        Reporting Act 1993) the accounting reference date and in
                        the case of Permutit New Zealand the balance date shall
                        be changed in accordance with any instructions given by
                        the Purchaser; and

                that minutes of the duly held board meeting, certified as
                correct by the secretary of the relevant Group Company and the
                resignations and acknowledgements referred to are delivered to
                the Purchaser's Solicitors; and

        (vii)   deliver to the Purchaser or the Purchaser's Solicitors the
                documents of title relating to the Properties, the Dubai Leases
                and the Australian Licence.

                                    Part B

At Completion the Purchaser shall:

        (i)     pay L6,2687,037 of the Purchase Price to TWPS' account with
                National Westminster Bank at 21 Lombard Street, London with the
                balance of the Purchase Price to be satisfied by setting it off
                against the indebtedness represented by the Loan Note;

        (ii)    deliver to the Sellers' Solicitors, duly executed by the
                Purchaser, a counterpart original of the Tax Covenant; and

        (iii)   deliver to the Sellers a copy (certified by the secretary of the
                Purchaser to be a true copy of a resolution in force at
                Completion) of the resolution of the directors of the Purchaser
                which authorised the purchase of the Shares for the Purchase
                Price and upon the terms set out in this agreement.

        (iv)    deliver to Sellers a copy (certified by the secretary of the
                Purchaser's Guarantor of a resolution in force at Completion) of
                the resolution of the directors of the
<PAGE>
 
                                       41

                Purchaser's Guarantor which authorised the entry by the
                Purchaser's Guarantor into this agreement.

                                    PART C

        After Completion the Sellers shall instruct all employees of the
Retained Group who receive requests relating to the Business of the Group to
pass on such requests to the relevant Group Company.
<PAGE>
 
                                       42

                                  SCHEDULE 2

                        Warranties and Representations

1.      Ownership of the Shares

        TWPS is the beneficial owner of all the Permutit UK Shares and PWT is
the beneficial owner of all the Permutit Australia Shares and such Shares in
aggregate constitute the entire allotted issued share capital of the Companies.
All the Shares are fully paid up.

2.      Capacity of the Sellers

(A)     The Sellers and the Sellers' Guarantor will at Completion have the right
        and power to enter into and perform this agreement and the Tax Covenant
        and in particular to sell and transfer or procure the transfer of, all
        the Shares to the Purchaser in accordance with the provisions of this
        agreement.

(B)     This agreement constitutes and the Tax Covenant and the other documents
        executed by the Sellers and the Sellers' Guarantor which are to be
        delivered at Completion will, when executed, constitute binding
        obligations of the Sellers and the Sellers' Guarantor.

(C)     The execution and delivery of, and the performance by, the Sellers and
        the Seller's Guarantor of their obligations under this agreement and the
        Tax Covenant will not:

        (i)     result in a material breach of any provision of the memorandum
                or articles of association of the Sellers or the Sellers'
                Guarantor; or

        (ii)    result in a material breach of, or constitute a material default
                under, any instrument to which the Sellers or the Sellers'
                Guarantor or any member of the Retained Group are a party or by
                which the Sellers or the Sellers' Guarantor or any member of the
                Retained Group or any of their assets are bound; or

        (iii)   result in a breach of any order, judgment or decree of any court
                or governmental agency by which the Sellers or the Sellers'
                Guarantor or any member of the Retained Group or any of their
                assets are bound.

3.      Formal and legal

(A)     The contents of the recitals and schedules 4, 5, 6 and 8 are true,
        accurate and complete in all respects and are not misleading because of
        any omission or ambiguity or for any other reason.
<PAGE>
 
                                       43

(B)     Permutit UK does not have any Subsidiaries. Permutit Australia has only
        one Subsidiary namely Permutit New Zealand. No Group Company owns any
        other shares or is a member, otherwise than through the holding of share
        capital, of any corporate or unincorporated body. No Group Company has
        any outstanding liability resulting from having held such shares or
        having been such a member. The shares in Permutit Engineering Company of
        Australia Pty Limited were transferred by Permutit Australia to Permutit
        Asia/Pacific Limited at the value give to them in the Accounts.

(C)     Permutit UK owns shares in Permutit Egypt Limited solely as nominee and
        accordingly such shares have no value to Permutit UK.

(D)     All documents required by law to be filed with or delivered to: 

        (i)     in respect of Permutit UK, to the Registrar of Companies;

        (ii)    in respect of Permutit Australia, the Australian Securities
                Commission; and

        (iii)   in respect of Permutit New Zealand, the Registrar of Companies
                in New Zealand;

        have, in all material respects, been properly made, delivered and duly
        filed.

(E)     The copies of the memorandum and articles of association of the Group
        Companies annexed to the Disclosure Letter are true, complete and
        accurate and in all material respects the Register of Members and other
        statutory books of the Group Companies (including, without limitation,
        all registers required to be kept by Permutit UK under the Companies
        Acts or by Permutit Australia under the Corporations Law or in relation
        to Permutit New Zealand under the Companies Act 1955):

        (i)     have been properly kept; and

        (ii)    contain a true, accurate and complete record of the matters
                which should be dealt with and recorded therein.

(F)     All title deeds, share certificates and agreements to which any Group
        Company is party owned by or which ought to be in the possession of each
        Group Company are in the possession of the relevant Group Company and
        are properly stamped.

(G)     The Group Companies have conducted their business in all respects in
        accordance with their memorandum and articles of association and with
        all applicable Statutes in the United Kingdom as regards Permutit UK,
        Australia as regards Permutit Australia, and New Zealand as regards
        Permutit New Zealand and in any foreign country in which they carry on
        business and there is no violation
<PAGE>
 
                                       44

        of, or default with respect to, any Statute, or any judgment or decision
        of any court or central or local governmental agency of the United
        Kingdom, Australia or New Zealand (as the case may be) or any foreign
        country which has or could have a material adverse effect upon the
        assets, business or profitability of any Group Company. In so far as
        this warranty applies to countries other than the United Kingdom,
        Australia and New Zealand, the Sellers will not be liable for any breach
        of warranty where they can show that the relevant Group Company has
        acted in accordance with normal business practice in the relevant
        country.

4.      Capital and distributions

(A)     The Group Companies have no loan capital outstanding (whether created or
        issued) and since the Accounts Date no loan or share capital of any
        Group Company has been allotted or issued or put under option or agreed
        to be allotted or issued or to be put under option and no person has the
        right (whether exercisable now or in the future and whether contingent
        or not) to call for the transfer or allotment or issue of any share or
        loan capital of the Group Companies.

(B)     There is not outstanding any indebtedness or other liability (of
        whatsoever nature, whether present or future, actual or contingent)
        owing:-

        (i)     by the Group Companies to any member of the Retained Group or to
                any director or former director of any Group Company or to any
                person connected with any Group Company or with any member of
                the Retained Group or with any director or former director of
                any Group Company; or

        (ii)    to the Group Companies by any member of the Retained Group or by
                any director or former director of any Group Company or by any
                person connected with any Group Company or with any member of
                the Retained Group or with any director or former director of
                the Group Companies:

        and for the purposes of this sub-paragraph 4(B) section 839, Income and
        Corporation Taxes Act 1988 shall apply in determining whether any person
        is connected with any other.

(C)     Since the Accounts Date no dividend or other distribution has been
        declared or paid (and there has been no agreement to do any of the
        foregoing) on, and no capital distribution made or agreed to be made in
        respect of, any share capital of the Group Companies and, save as
        provided in this agreement, no loan (otherwise than in the ordinary
        course of day to day business) or loan capital has been repaid by the
        Group Companies in whole or in part. Without prejudice to the foregoing,
        since 31st March, 1995 no distribution has been made or agreed to be
        made for tax purposes.
<PAGE>
 
                                       45

(D)     So far as the Sellers are aware, Permutit UK has not entered into any
        transaction nor been given a preference to which sections 238 or 239, or
        sections 242 or 243, Insolvency Act 1986 may apply or which may
        otherwise be liable to be set aside or avoided for any reason.

(E)     So far as the Sellers are aware Permutit Australia has not entered into
        any transaction nor has been given a preference to which sections
        588FA - 588FE of the Corporations Law may apply or which may otherwise
        be liable to be set aside or avoided for any reason.

(F)     So far as the Sellers are aware Permutit New Zealand has not entered
        into any transaction nor has been given a preference to which sections
        266 -275 of the Companies Act 1955 of New Zealand may apply or which may
        otherwise be liable to be set aside or avoided for any reason.

5.      Accounts

(A)     The Accounts:

        (i)     were prepared in accordance with applicable law and accountancy
                practices, standards and principles generally accepted in the
                United Kingdom in respect of Permutit UK and Australia in
                respect of Permutit Australia at the time they were audited; and

        (ii)    showed a true and fair view of the state of affairs of the Group
                Companies as at the Accounts Date and its profits or losses for
                the financial period ended on that date.

(B)     Save as disclosed in the Disclosure Letter, the accounting records of
        the Group Companies have been kept on a proper and consistent basis in
        all material respects, are up-to-date and, in all material respects,
        contain details of the business activities of the Group Companies and of
        all matters required, where relevant, by the Companies Acts or relevant
        Australian or New Zealand laws or regulations to be entered in them.

(C)     The profits or losses of the Group Companies for the period ended on
        28th February 1995 and for the accounting period ended on the Accounts
        Date as shown in the Management Accounts of the Group Companies and the
        Accounts have not been affected by the inclusion of extraordinary or
        exceptional items of income or expenditure.

6.      Properties

(A)     Ownership of land

        The Properties referred to in schedule 8 owned by the Group are
<PAGE>
 
                                       46

        the only Immovable Properties owned, used or occupied by the Group or in
        respect of which the Group has any estate, interest, right or liability
        (including any continuing or contingent liability) and for the avoidance
        of doubt no Group Company has given any guarantee which is still
        subsisting of the performance by any person of any obligation in respect
        of any Immovable Property. Each of the Properties is used and occupied
        for the purpose of the business of a member of members of the Group.

(B)     UK Property Warranties

        In relation to each of the UK Properties:-

                (a)     Title

                        The Properties are owned by the relevant Group Company
                        free from any option, right of pre-emption, mortgage,
                        charge (fixed or floating), pledge, lien or any like
                        encumbrance or any agreement in respect thereof which
                        are not apparent from the documents of title disclosed
                        to the Purchaser or which would not be disclosed by
                        searches and enquiries which would be carried out by a
                        prudent purchaser.

                (b)     Documents of Title

                        All documents of title for the Properties are in the
                        possession or under the control of the relevant Group
                        Company.

                (c)     Planning matters and use

                        (d)     the current use of the Properties is permitted
                                under Town and Country Planning legislation and
                                (in the case of properties which are leasehold)
                                is also permitted by the leases under which the
                                Properties are held;


                        (e)     all necessary planning permissions and other
                                consents in respect of the Properties have been
                                obtained and all development on the Properties
                                has been carried out in accordance with planning
                                legislation.

                (f)     Statutory obligations

                        All statutes, orders or regulations affecting the
                        Properties, its current user or development have been
                        observed.
<PAGE>
 
                                       47

                (g)     Disputes notices and claims

                        There are no outstanding litigation, disputes, actions,
                        claims, demands or complaints in respect of the
                        Properties and no notice affecting the Properties has
                        been given or received nor does any member of the Group
                        expect any.

                (h)     Services and access

                        There are available to the Properties all rights and
                        easements and such services (including, without
                        limitation, electricity, gas and water supply, sewage
                        and telecommunications) as are necessary for the
                        existing use of the Properties.

                (i)     Enquiries

                        The Seller's replies to written enquiries concerning the
                        Properties and the Isleworth Property made by the
                        Purchaser's Solicitors have been given after making due
                        and diligent enquiry and are true and accurate in all
                        material respects. For the purposes of this paragraph
                        (i) a reply to a written enquiry shall be true and
                        accurate "in all material respects" if the amount of the
                        claim in respect of any inaccuracy does not exceed
                        L5000.

                (j)     Condition

                        All buildings and structures comprised in the Properties
                        are in a state of repair and condition which is adequate
                        to enable the business of the Company to be carried on
                        as it is carried on at present.

                (k)     Leasehold Properties

                        Where any of the Properties are leasehold, the leases
                        under which the Properties are held are correctly
                        summarised in schedule 8 and the current rents are
                        evidenced by memoranda of rent review where they are not
                        the rents originally reserved.

(C)     New Zealand Property Warranties 

        In relation to Permutit New Zealand the New Zealand Property comprises
        all the land and buildings owned or occupied by Permutit New Zealand
        and:

        (i)     there are no restrictive covenants or provisions, legislation or
                orders which preclude the use of the New Zealand Property for
                the purposes for which it is now used,
<PAGE>
 
                                       48

                and that use is permitted under the provisions of the planning
                acts and regulations and is in accordance with the requirements
                of the relevant local authorities;

        (ii)    the Sellers have received no notice alleging breach of any
                covenant, restriction or other obligation (including by-laws)
                affecting the New Zealand Property and no rights, easements,
                quasi-easements or privileges exist in favour of any person in
                respect of the New Zealand Property which would interfere with
                or prevent the use of the New Zealand Property for the purposes
                for which it is now used;

        (iii)   there are no outstanding enforcement or other notices or
                proceedings issued in respect of the New Zealand Property nor,
                so far as the Sellers are aware, any order or resolution for the
                compulsory acquisition of any part of any of the New Zealand
                Property;

        (iv)    so far as the Sellers are aware the New Zealand Property is not
                subject to or affected by any planning permission or development
                permit or any proposals for road widening or any other notices
                whatsoever issued by any governmental or municipal department or
                other competent authority which would interfere with or prevent
                the continued use of the New Zealand Property for the purposes
                for which it is now used;

        (v)     the Sellers have received no notice alleging breach of the terms
                of any agreement affecting the New Zealand Property;

        (vi)    so far as the Sellers are aware there is no liability for
                repairs or dilapidations or to carry out works in respect of the
                New Zealand Property; and

        (vii)   so far as the Sellers are aware and except in respect of matters
                which do not have a material adverse effect the lease of the New
                Zealand Property is current valid and enforceable.

(D)     Australian Property Warranties

        (i)     (a)     There is no restriction on the Company's exclusive
                        occupation and quiet enjoyment of the Australian
                        Property that would have a material adverse effect on
                        the Company.

                (b)     There are no Encumbrances affecting the Australian
                        Property that have a material adverse effect on the
                        Company.

                        For the purpose of this sub-paragraph "Encumbrance"
                        means a mortgage, charge, pledge, lien or other
                        encumbrance (but excludes a lien that arises as a
<PAGE>
 
                                       49

                        matter of law or an encumbrance that arises from any
                        reservation of title provision).

        (ii)    The Australian Property comprises all the freehold or leasehold
                properties owned, used or occupied by the Company in connection
                with the business of the Company.

        (iii)   As far as the Sellers are aware the use of the Australian
                Property by the Company for the business of the Company does not
                constitute a breach of any of applicable law that would have a
                material adverse effect on the Company.

        (iv)    As far as the Sellers are aware, all covenants contained in the
                leases and licences disclosed in schedule 8 affecting the
                Australian Property that would have a material adverse effect on
                the Company if they were not properly performed or observed have
                been properly performed or observed.

        (v)     As far as the Sellers are aware there are no outstanding orders
                or notices affecting the Australian Property or any proposals
                from any local or other authority (involving compulsory
                acquisition or requisition or otherwise) or any other
                circumstances which would result in any such order or notice
                being made or served which would have a material adverse on the
                Company's quiet enjoyment of the Australian Property.

        (vi)    As far as the Sellers are aware and except in respect of matters
                which do not have a material adverse effect all leases and
                licences of the Australian Property are current, valid and
                enforceable.

7.      Business and trading

(A)     Since the Accounts Date the Group Companies have carried on in the
        ordinary and usual course the business carried on by the Group at that
        date and have not carried on any other business, or acquired or disposed
        of any fixed asset exceeding L10,000 in value, or assumed or incurred
        any liability (actual or contingent), or entered into any contract, in
        each case other than in such ordinary and usual course.

(B)     Since the Accounts Date there has been no material adverse change in the
        Group's financial position.

(C)             (i)     The Group Companies own or have on lease or hire
                        purchase the motor vehicles the make, model,
                        registration number and driver of which are set out
                        opposite their names in a schedule annexed to the
                        Disclosure Letter.

               (ii)     All material plant, machinery, vehicles and equipment
                        owned or used by the Group Companies is in such a
                        condition that
<PAGE>
 
                                       50

                the Business of the Group can be carried on after Completion in
                the same way as it was carried on at the date hereof.

        (iii)   Maintenance contracts as annexed to the Disclosure Letter are in
                full force and effect and all assets to which such maintenance
                contracts relate have been maintained in all material respects
                in accordance with safety regulations usually observed in
                relation thereto and the terms and conditions of any leasing or
                similar agreement.

        (iv)    The asset registers of the Group Companies (a true and correct
                copy of which is annexed to the Disclosure Letter) comprise, in
                all material respects, a complete and accurate record of all
                plant, machinery, vehicles, equipment and other assets owned,
                used or possessed by the Group Companies.

        (v)     All plant, machinery, vehicles, equipment or other assets used
                by the Group Companies (including, without limitation, any
                computer installation used by any Group Company) are the
                absolute and unencumbered property of the Group Companies and
                are not subject to nor agreed to be subject to any leasing, hire
                or hire purchase agreement or agreement for payment on deferred
                terms or any similar agreement or arrangement nor are they
                loaned or otherwise unavailable to the Group Companies.

(D)     All the book and  other  debts  of  the  Group  Companies  outstanding 
        at Completion:-

        (i)     are the absolute property of the Group Companies and not the
                subject of any assignment, factoring agreement or other
                encumbrance; and

        (ii)    are no more than 90 days old from their dates of invoice.

(E)     Since the Accounts Date:

        (i)     the Group Companies have continued to pay their creditors in the
                ordinary course of business and there are no debts due from the
                Group Companies which have been due for more than 90 days; and

        (ii)    no debt has been released by the Group Companies on terms that
                the debtor paid more than L10,000 less than the book value of
                his debt and no debt owing to the Group Companies has been
                deferred, subordinated or written off or has proved to any
                extent to be irrecoverable.

(F)             (i)     Details of the insurance policies in respect of which
                        any member of the Group has an interest are set out in
                        the Disclosure Letter;
<PAGE>
 
                                       51

        (ii)    Such policies are in full force and effect;

        (iii)   The premiums on such policies are up to date;

        (iv)    So far as the Sellers are aware, there are no circumstances
                which might lead to any liability on such policies being avoided
                by the insurers or the premiums being increased; and

        (v)     So far as the Sellers are aware, there is no claim outstanding
                on such policies and, so far as the Sellers are aware there has
                been no act or omission which would or might lead to such a
                claim.

(G)     The Group Companies do not carry on business under or use on their
        letterhead or business documents a name other than the full corporate
        name of the relevant Group Company, Permutit UK has not received any
        direction under section 28, Companies Act 1985, none of the Group
        Companies has received any notice that they may become obliged to change
        their names or trade under different names, and so far as the Sellers
        are aware there are no other circumstances by reason of which the Group
        Companies may become obliged to change their names or trade under
        different names.

(H)             (i)     The Group Companies are the sole beneficial owner of all
                        registered Intellectual Property referred to in the
                        schedule which is annexed to the Disclosure Letter and
                        constitutes the only registered Intellectual Property
                        owned by the Group Companies. No registered user rights
                        or licences have been granted or agreed to be granted
                        and no agreement for assignment has been made in respect
                        of such Intellectual Property and no act has been done
                        by any member of the Group (except for acts which are
                        both reasonable and in the normal course of business)
                        whereby any part of such Intellectual Property might
                        cease to be valid and enforceable and no member of the
                        Group pays any royalty or other payment to any third
                        party in relation to such Intellectual Property (except
                        for renewal fees, agents fees and other administrative
                        expenses in the normal course of business). All renewal
                        fees in respect of such Intellectual Property which are
                        due and payable have been paid.

               (ii)     So far as the Sellers are aware, there is no existing
                        fact, matter or circumstance which is reasonably likely
                        to result in any of the rights of any of the Group
                        Companies in the Permutit Brand Name becoming invalid or
                        unenforceable.

              (iii)     All rights in all Intellectual Property which are
                        Required for the Business of the Group are solely and
                        beneficially owned by or licensed to the relevant member
                        of the Group (or, where clause 13(G) applies, the
                        relevant member of the Retained Group) and no act has
                        been done by any member of the Group (except for acts
                        which are both reasonable and in
<PAGE>
 
                                       52

                the normal course of business) whereby any part of such
                Intellectual Property might cease to be valid and enforceable.
                No material licences have been granted or agreed to be granted
                and no agreement for assignment has been made in respect of such
                Intellectual Property by any member of the Group. All material
                licences of Intellectual Property to any member of the Group
                have been disclosed in the Disclosure Letter.

        (iv)    No member of the Group is in breach of any material licence
                granted to it in respect of any Intellectual Property.

        (v)     No member of the Group has received any notice that the conduct
                of the business of such member of the Group as presently
                conducted infringes the rights of any other person in
                Intellectual Property.

        (vi)    No member of the Group has disclosed any of its know-how, in
                respect of Scion and Scion/Hipol technology and products other
                than subject to confidentiality agreements which a company
                carrying on the same business as the Group Company could
                reasonably be expected to have entered into.

        (vii)   Without prejudice to sub-paragraph (vi) of this paragraph (H),
                so far as the Sellers are aware no Group Company has disclosed
                any of its:

                (a)     other know-how;

                (b)     trade or financial secrets; or 

                (c)     lists of customers,

                to any person (other than subject to a confidentiality
                agreement) in circumstances which would or might result in any
                material adverse effect on any Group Company.

        (viii)  For the purposes of this paragraph (H), any Intellectual
                Property is "Required for the Business" of the relevant Group
                Company if (and only if) it:

                (a)     except in relation to Specified Intellectual Property in
                        Specified Items is or has in the last two years been
                        used in the business of the relevant Group Company; or

                (b)     is Specified Intellectual Property; or

                (c)     is Intellectual Property in Available Items; or

                (d)     is required to carry on the business of the relevant
                        Group Company in the same manner as it is presently
                        carried on; or
<PAGE>
 
                                       53

                (e)     is required to fulfil any of the present contracts of
                        the relevant Group Company in relation to its business;
                        or

                (f)     is required to fulfil contracts which are the subject of
                        tender or negotiation at Completion; or

                (g)     is required to fulfil contracts which are the subject of
                        enquiry by the relevant Group Company at Completion; or

                (h)     is required to comply with any law applicable in
                        relation to its business.

        (ix)    The Sellers warrant that:-

                        (i)     the Items referred to in paragraphs 1, 5 and 6
                                of Schedule 11 are in the possession of the
                                Group Companies;

                        (ii)    the Items referred to in paragraph 2 of Schedule
                                11 are in the possession of the Group Companies
                                so far as material in relation to products and
                                contracts sold or made since 1st April, 1986;

                        (iii)   the Items referred to in paragraph 3 of Schedule
                                11 are in the possession of the Group Companies
                                so far as material in relation to products sold
                                since 1st April, 1986;

                        (iv)    the Items referred to in paragraph 4 of Schedule
                                11 are in the possession of the Group Companies
                                in any case where they have at any time during
                                the last two years been in the possession of the
                                Group Companies;

                Except as warranted above in this paragraph (ix), no warranty is
                given by the Sellers as to the possession by the Group Companies
                of any of the Specified Items. This warranty and the preceding
                sentence are without prejudice to clause 13(G).

(I)             (i)     Save pursuant to the express terms of this agreement, no
                        Group Company is party to any arrangement which
                        infringes or which has or should have been registered
                        under the RTPA or which infringes the Fair Trading Act
                        1973 or which infringes the Competition Act 1980 or
                        Articles 30 to 34, Article 85 or Article 86 of the
                        Treaty of Rome or contravenes the provisions of the
                        Resale Prices Act 1976 or any other anti-trust
                        legislation and no Group Company has pursued or is
                        pursuing any course of conduct which amounts to an anti-
                        competitive practice within section 2, Competition Act
<PAGE>
 
                                       54

                        1980 or is subject to or under notice of any
                        investigation, report decision, undertaking or order
                        under that Act.

        (ii)    So far as the Sellers are aware no Group Company is party to any
                agreement or arrangement which has been notified to the
                Commission of the European Community for an exemption or in
                respect of which an application has been made to the said
                Commission for negative clearance.

(J)     The Group Companies have in full force and effect all licences,
        consents, registrations, authorities and other qualifications necessary
        for the carrying on of their business as and where such business is now
        carried on (details of which are set out in the Disclosure Letter) and
        so far as the Sellers are aware there has been no act, event or omission
        as a result of which any such qualification will or may be withdrawn,
        not be renewed or otherwise cease to have effect. All reports, returns
        and information required by law or as a condition of any licence,
        consent, permit or approval to be made or given to any person or
        authority in connection with the business of the Group Companies have
        been made or given to the appropriate person or authority, in each case,
        to the extent material in the context of the business of the relevant
        Group Company.

(K)     No Group Company has outstanding:

        (i)     any commitment for capital expenditure in excess of L1,000;

        (ii)    any commitment for the purchase of goods or services under which
                supply or delivery is liable to take place more than 12 months
                from the time of fixing the price;

        (iii)   any commitment to obtain or supply goods or services exclusively
                from or to any person;

        (iv)    any agreement or arrangement in which any member of the Retained
                Group or any director of any such member or any person connected
                with them as described in section 839, Income and Corporation
                Taxes Act 1988 is interested other than an agreement or
                arrangement entered into on an arm's length basis;

        (v)     any agreement or arrangement for consultancy or similar
                services;

        (vi)    any agreement or arrangement not negotiated on an arm's length
                basis;

        (vii)   any contract or arrangement which restricts its freedom to carry
                on its business in any part of the world in such manner as it
                may think fit; or
<PAGE>
 
                                       55


        (viii)  any contract entered into other than in the ordinary course of
                business.

(L)     The list of open orders (order bank) annexed to the Disclosure Letter is
        complete and accurate. The margin bank for such orders has been
        calculated in good faith in accordance with the normal method of the
        relevant Group Company as applied in calculating the margin bank
        forecast for 31st March, 1995 and represents the Sellers' best estimate
        of the margin attaching to such orders as at 31st March, 1995.

(M)     Complete and accurate copies of all systems contracts as at 24th March,
        1995, where handover has not been accepted by the customer, where the
        consideration receivable by the relevant Group Company will or may be
        more than L50,000 are annexed to the Disclosure Letter. Such copies
        contain full details of the terms of the contract, any guarantees given
        under the relevant contract, penalty clauses, warranties given, work
        carried out to-date, costs incurred and any commitments in respect of
        completion. There have been no material changes in such contracts since
        that date outside the ordinary course of business.

(N)     A complete and accurate list of all planned maintenance contracts is
        annexed to the Disclosure Letter. This list shall contain details of the
        parties to the contract, the level of service to be provided by the
        relevant Group Company and the consideration payable.

(O)     There is not outstanding nor has any Group Company agreed to enter into
        or give or create:

        (i)     any mortgage, charge, pledge, lien or similar encumbrance nor
                any equity nor any option on or over the whole or any part of
                the undertaking, property or assets of the Group excluding any
                such encumbrance arising in the ordinary course of trade;

        (ii)    any contract for hire or rent, hire purchase or purchase by way
                of credit sale, conditional sale or periodical payment in
                respect of movable or personal property;

        (iii)   any guarantee, indemnity or suretyship;

        (iv)    any power of attorney;

        (v)     any authority (express or implied) to any person (other than a
                director duly authorised or to employees to enter routine
                contracts) to bind or commit any Group Company in any way;

        (vi)    any partnership, joint venture, European Economic Interest
                Grouping or consortium arrangement involving any Group
<PAGE>
 
                                       56

                Company nor is any Group Company a member of any other
                unincorporated association;

        (vii)   any agency, distributorship, licensing or managing agreement; or

        (viii)  any financial assistance from any international, national or
                local authority or governmental agency.

(P)     Each systems contract and each other material contract to which each
        Group Company is a party is a legal, valid and binding obligation of the
        relevant Group Company and is in full force and effect. Each party to
        such contracts has so far as the Sellers are aware performed all
        material obligations required to be performed by it under such contracts
        and so far as the Sellers are aware is not in breach or default nor is
        alleged to be in breach or default in any material respect thereunder,
        and so far as the Sellers are aware no other event has occurred and no
        condition or state of facts exists (or would exist upon the giving of
        notice or the lapse of time or both) that would become or cause a breach
        or default in any material respect thereunder where in any such case the
        loss to the relevant Group Company would be greater than L15,000,
        Provided always that if there are a number of claims each less than such
        amount but together aggregating L100,000 or more, then they shall be
        treated as a single claim of more than L15,000.

(Q)     The Management Accounts have been prepared in accordance with the same
        accounting principles as the Accounts.

(R)     No intimation has been received by any Group Company that the
        transactions contemplated by this agreement will result in loss of
        business with any of the Group Companies' present suppliers or
        customers.

(S)     None of the Group Companies are party to any agreement or arrangement
        material in the context of the business of the relevant Group Company
        which is or may become terminable by another party or under which the
        rights of any person are likely to be affected as a result of any of the
        transactions contemplated by this agreement or Completion or which
        grants any rights to any person dependent on Completion.

(T)     No Group Company has outstanding any bid or tender or sale or service
        proposal which is substantial in relation to the business of the
        relevant Group Company. (For these purposes substantial means any bid or
        tender where the price offered is more than, in relation to Permutit UK,
        L150,000, in relation to Permutit Australia, Australia dollars 300,000
        and in relation to Permutit New Zealand, New Zealand dollars 375,000.) A
        list of such bids and tenders for installed system contracts is annexed
        to the Disclosure Letter. Such bids and tenders have been made and
<PAGE>
 
                                       57

        priced in accordance with the normal business practice of the relevant
        Group Company.

(U)     All assets acquired or disposed of by the Group Companies have been
        acquired or disposed of at market value, other than assets acquired or
        disposed of intra group, and no agreements or arrangements have been
        entered into during the two years prior to the date hereof to which any
        of the Group Companies are party and in which a shareholder in or a
        director of any of the Group Companies or any person connected with any
        such person as described in section 839, Income and Corporation Taxes
        Act 1988 has been interested whether directly or indirectly and in
        particular (but without limitation) no Group Company has entered into
        any transaction which, had such Group Company been a listed company,
        would have been a transaction with a related party (as defined in
        chapter 11 of the Listing Rules issued by the London Stock Exchange).

(V)             (i)     Not more than ten per cent. in value of purchases by
                        each Group Company in each of the last two calendar
                        years have been placed with any one supplier (and, so
                        far as the Sellers are aware, in the current calendar
                        year not more than ten per cent. in value of purchases
                        by each Group Company will be so placed) and the Sellers
                        have annexed to the Disclosure Letter full written
                        particulars of all customers of any Group Company whose
                        purchases of any product, stock or services of such
                        Group Company have in any of the last three calendar
                        years exceeded ten per cent. of such Group Company's
                        turnover of such product or stock for such calendar
                        year.

               (ii)     Since the Accounts Date the business of the Group
                        Companies has not been affected to any material extent
                        by the loss of any important contract or customer or
                        source of supply nor has any customer or supplier
                        material in the context of the business of the relevant
                        Group Company indicated an intention to cease trading
                        with or supplying any Group Company or that it is likely
                        to reduce its trading with or supply to any Group
                        Company.

              (iii)     No customer or supplier of any Group Company has
                        indicated an intention to change the basis or terms on
                        which it is prepared to enter into contracts or do
                        business with such Group Company and no such change has
                        taken place during the two years ending with Completion
                        in each case, to an extent material in the context of
                        the relevant Group Company.

(W)     Particulars of all grants, allowances, aids and subsidies paid or made
        or pledged to any Group Company during the last six years by, and of all
        outstanding claims by any Group Company for any such grant, allowance,
        aid or subsidy from, any supranational, national or local authority or
        government agency are set out in
<PAGE>
 
                                       58

        the Disclosure Letter and no Group Company has done or failed to do any
        act or thing which could result, nor will the sale of the Shares result,
        in all or any part of such grant, allowance, aid or subsidy becoming
        repayable or forfeited.

(X)     No Group Company has any of its records needed for the conduct of its
        business, systems, controls, data or information recorded, stored,
        maintained, operated or otherwise wholly or partly dependent on or held
        by any means whatsoever which (including all means of access thereto and
        therefrom) are not under the exclusive ownership and direct control of
        such Group Company.

(Y)     Permutit UK has registered with the Registrar under the Data Protection
        Act 1984.

(Z)     Details of all bank accounts maintained or used by each Group Company
        (including, in each case, the name and address of the bank with whom the
        account is kept and the number and nature of the account) and of all
        direct debit or standing order or similar authorities applicable to any
        of the accounts are set out in or attached to the Disclosure Letter.

(AA)    Full details of all overdraft, loan and other financial facilities
        available to the Group are set out in the Disclosure Letter and neither
        the Sellers nor any Group Company has done anything whereby the
        continuance of any of those facilities would be affected or prejudiced.
        There will be no outstanding debts owing by Group Companies (other than
        trading indebtedness) at Completion.

(BB)    No order has been made and no resolution has been passed for the winding
        up of any Group Company or for a provisional liquidator to be appointed
        in respect of any Group Company and no petition has been presented of
        which notice has been given to any Group Company and no meeting has been
        convened for the purpose of winding up any Group Company.

(CC)    No administration order has been made and no petition for such an order
        has been presented of which notice has been given to any Group Company
        in respect of that Group Company.

(DD)    No receiver (which expression shall include an administrative receiver)
        or, in the case of Permutit New Zealand, manager has been appointed in
        respect of any Group Company or all or any of its assets or undertaking
        and no steps have been taken by any Group Company with a view to the
        appointment of such a person.

(EE)    No Group Company is insolvent, or unable to pay its debts within the
        meaning of section 123 Insolvency Act 1986, or in relation to Permutit
        New Zealand section 261 Companies Act 1955, or has stopped paying its
        debts as they fall due.
<PAGE>
 
                                       59

(FF)    No voluntary arrangement has been proposed under section 1 Insolvency
        Act 1986, or in relation to Permutit New Zealand, section 209J Companies
        Act 1955 in respect of any Group Company and its creditors and/or
        members of any class of its creditors and/or its members.

(GG)    No unsatisfied judgment is outstanding against any Group Company or the
        whole or any part of it, its assets or undertaking.

(HH)    No controller or administrator (as each of those terms is defined in the
        Corporations Law) or any other person has taken possession or has
        control of the property of Permutit Australia or is appointed to
        Permutit Australia or any action has been taken which could result in
        any such event occurring.

(II)    No inspector is or has been appointed to investigate the affairs of
        Permutit Australia pursuant to the Australian Securities Commission Act
        1989.

(JJ)    No compromise or arrangement is proposed or has been made between
        Permutit Australia and its creditors and/or members or any creditor or
        member or any class of member and no application has been made to any
        court for an order summoning a meeting of creditors of Permutit
        Australia.

(KK)    Save as contemplated by clause 10 no member of the Retained Group nor
        any director of any such member has any interest in any business which
        competes, directly or indirectly, with any business now carried on by
        any Group Company.

(LL)    All information relating to installed systems which has at any time
        since 1st January, 1988 belonged to any Group Company is held and owned
        by such Group Company at the time of Completion.

(MM)    Save as expressly contemplated herein, no Group Company has since 31st
        March, 1995 undertaken any acts outside the ordinary course of business.

(NN)    The regeneration plant at the Manchester Property is operating as
        effectively and fully at the date of this agreement as it was when first
        fully commissioned.

8.      Employees

(A)     The schedule of officers and employees of each Group Company showing
        details of all their terms of employment (including the name, sex, age,
        position held, hours of work, date of commencement of period of
        continuous service, notice period, number of days' statutory sick pay
        received during current calendar year, current salary and other benefits
        of each such person) annexed to the Disclosure Letter is true, complete
        and accurate in all material respects.
<PAGE>
 
                                       60


(B)     There is no liability whatsoever to make any payment to or for the
        benefit of any person (whether or not an officer or employee or former
        officer or employee) in respect of past service or the termination of
        the employment of that or any other person and there are no amounts
        owing to any present or former directors or employees or members of any
        Group Company.

(C)     No person is employed by any Group Company on terms which in any
        particular circumstances would entitle him to a bonus or incentive
        payment or commission (based on profits or turnover) or participation in
        a share option scheme, share incentive scheme or profit sharing, bonus
        or other such incentive scheme, and no Group Company has in existence
        nor has it indicated any proposal to introduce any such scheme.

(D)             (i)     The terms of employment shown in the schedule specified
                        in paragraph 8(A) are the same as applied at the
                        Accounts Date.

               (ii)     There is no outstanding commitment to increase the
                        remuneration or change the other terms of employment of
                        any officer or employee of any Group Company and there
                        is no agreement or arrangement (whether legally binding
                        or not) between any Group Company and any employee or
                        ex-employee relating to his employment, his ceasing to
                        be employed or his retirement.

(E)     No employee of any Group Company:-

                (i)     at the date of the cessation of his employment with such
                        Group Company earning a salary or wages of more than
                        L10,000 per annum has during the period of twelve months
                        preceding the making of this agreement: or

               (ii)     possessed of confidential information or customer
                        goodwill the disclosure of which by that employee or the
                        soliciting of which from that employee would be
                        detrimental to any Group Company has during the period
                        of three years preceding the making of this agreement:

               ceased to be employed by such Group Company (other than through
               retirement at normal retirement age) and no employee has given
               any Group Company or the Sellers any indication that he will
               leave a Group Company's employ as a result of the transactions
               contemplated by this agreement.

(F)     No Group Company has any agreement or other arrangement (binding or
        otherwise) with and has not recognised any trade union or other body
        representing its employees or any of them and no trade union or body has
        such a level of membership among any employees of any Group Company as
        would be likely to entitle that trade union or body to recognition by
        such Group Company.
<PAGE>
 
                                       61


(G)     None of the Group Companies nor any of their employees is engaged or
        involved in any industrial or trade dispute or any dispute or
        negotiation and no act, event or omission has occurred which is likely
        to give rise to any such dispute, or negotiation.

(H)     There are no training schemes, arrangements or proposals in existence
        nor have there been in the past any such schemes, arrangements or
        proposals, in respect of which a levy may become payable by Permutit UK
        under the Industrial Training Act 1982.

(I)     None of the Group Companies' senior employees have ever expressed to any
        of the Sellers opposition to the Purchaser's acquiring the Shares or
        offered to purchase any of the Shares.

(J)     Permutit UK has not received and is not aware that it will receive any
        claim from any of its employees pursuant to the Patents Act 1977.

(K)     There is not outstanding any contract of service or contract for
        services between any Group Company and any of its directors, officers or
        employees which is not terminable by such Group Company without
        compensation (other than a statutory redundancy payment or statutory
        compensation for unfair dismissal) on one month's notice at any time.

(L)     No liability has been incurred by any Group Company for breach of any
        contract of service or contract for services, for redundancy payments,
        protective awards or for compensation for wrongful dismissal or unfair
        dismissal or for failure to comply with any order for the reinstatement
        or re-engagement of any employee or for any other liability accruing
        from the termination of any contract of service or contract for services
        and no gratuitous payment has been made or promised by any Group Company
        in connection with the actual or proposed termination or suspension of
        employment or variation of any contract of service of any present or
        former officer or employee.

(M)     In the period of one year preceding the date hereof Permutit UK:

        (i)     has not been a party to any relevant transfer (as such
                expression is defined in the Transfer of Undertakings
                (Protection of Employment) Regulations 1981);

        (ii)    has not failed to comply with any duty to inform and consult any
                independent trade union under the Transfer of Undertakings
                (Protection of Employment) Regulations 1981;

        (iii)   has not given notice of any redundancies to the relevant
                Secretary of State or started consultation with any independent
                trade union under the provisions of Part IV, Employment
                Protection Act 1975 nor has it failed to comply with any such
                obligation under the said Part IV.
<PAGE>
 
                                       62


(N)     The Group Companies have in relation to each of their employees and
        former employees complied with all obligations imposed on them by
        Statute, codes of conduct and practice, collective agreements, customs
        and practices and with all awards, recommendations and declarations in
        any way relating to the relations between them and their employees or
        any trade union and the conditions of service of their employees.

9.      DELIBERATELY LEFT BLANK.

10.     Taxation

        Administration

(A)     Each Group Company has for all periods falling within the seven years
        prior to Completion correctly made all returns and payments within the
        relevant time limits and provided all other information and documents
        required to be provided by such Group Company to any Tax Authority for
        any Tax purposes.

(B)     Each Group Company has for all periods falling within the seven years
        prior to Completion maintained all records as it is required to maintain
        by law for the purpose of any Tax.

(C)     In respect of any period not ended at Completion, no Tax Authority has
        operated or agreed to operate any arrangement (being an arrangement
        which is not based on relevant legislation or any published practice) in
        relation to any Group Company's Tax affairs.

(D)     Full particulars of all returns and payments in respect of any Tax each
        Group Company is required to make and all other information each Group
        Company is required to provide within twelve weeks after Completion or
        which any Group Company has been required by written notice from a Tax
        Authority to provide after Completion are set out in the Disclosure
        Letter.

(E)     There is no existing dispute in relation to Tax between any Group
        Company and any Tax Authority, no notification has been received by the
        Sellers or any Group Company from any Tax Authority suggesting that such
        Tax dispute may arise after Completion and no such dispute is
        contemplated by the Sellers or any Group Company.

(F)     No Group Company has been or currently is the subject of an
        investigation of a non-routine nature by any Tax Authority and, so far
        as the Sellers are aware, no such investigation is contemplated.

(G)     No Group Company has been a party to any transaction in respect of which
        any consent or clearance was required by law without such consent or
        clearance first having been obtained. All
<PAGE>
 
                                       63

        particulars provided to any Tax Authority in connection with the
        application for any consent, ruling or clearance, on behalf of the
        relevant Group Company or affecting the relevant Group Company, fully
        and accurately disclosed all material facts and circumstances relevant
        to the decision of the Tax Authority and any Transaction for which such
        consent, ruling or clearance has been obtained has been carried into
        effect (if at all) only in accordance with the terms of the relevant
        application and consent, ruling or clearance.

(H)     All elections and claims in respect of Tax made by each Group Company
        have been made correctly and any Transaction which is affected by the
        election or claim has been carried into effect (if at all) only in
        accordance with the terms of the election or claim.

(I)     Full particulars of all rulings, consents and clearances obtained in
        respect of any Group Company which contain any conditions which are
        required to be complied with after Completion are set out in the
        Disclosure Letter.

(J)     Each Group Company has sufficient records relating to past transactions
        (to the extent that such transactions are relevant), including any
        claims and elections made, to calculate any Tax Liability which would
        arise on the disposal or deemed disposal or realisation of any asset on
        or after Completion.

(K)     Each Group Company has made all deductions and withholdings from
        payments made or deemed to have been made by or through it in respect of
        periods not ended on or before Completion, and has accounted for all
        such deductions and withholdings to the relevant Tax Authorities as
        required by law.

(L)     Particulars of all existing agreements and arrangements under which any
        Group Company is obliged (or in the case of any put option, would be
        obliged) to make any payment or under which a payment would be deemed to
        be made by or through any Group Company after Completion are set out in
        the Disclosure Letter with specific reference to this clause and for the
        purposes of this clause a payment means any payment in respect of which
        the relevant Group Company may be required, by law, to make a deduction
        or withholding.

(M)     Permutit UK is not and, in respect of any period not ended on or before
        Completion, has not been, a branch or agent of any person not resident
        in the United Kingdom for United Kingdom tax purposes.

(N)     The Completion Accounts of Permutit UK will not include as an asset any
        Relief which consists of trading or capital losses which may be
        available to the company to be set against any trading or capital
        profits. Full details of all Reliefs which
<PAGE>
 
                                       64

        will be included as any asset or taken into account in calculating any
        provision in the Completion Accounts including the nature of the Relief
        and the time in which the claim or election for Relief should be made
        are set out in the Disclosure Letter.

(O)     The value adopted for the purposes of the Completion Accounts of
        Permutit UK of each of its assets on the disposal of which a chargeable
        gain or allowable loss could arise will not exceed the amount deductible
        under TCGA 1992, section 38.

(P)     All expenditure which Permutit UK has agreed to incur or consideration
        which Permutit UK has agreed to give on or after Completion which will
        not be fully deductible in calculating the trading income of the company
        for the period beginning immediately after Completion, is in respect of
        or in connection with an asset of Permutit UK on the disposal of which a
        chargeable gain or allowable loss could arise and all such expenditure
        and consideration given would be fully allowable as a deduction under
        TCGA 1992, section 38, in computing the chargeable gain or allowable
        loss of Permutit UK in respect of any disposal by Permutit UK of the
        relevant asset.

(Q)     The amount of consideration in money received or receivable by Permutit
        UK in respect of any disposal, on or before the time of disposal, of any
        asset (other than a trading asset) which it would be under an obligation
        to make at any time after Completion pursuant to any option or agreement
        entered into by Permutit UK on or before Completion is not less than the
        amount it will be treated as receiving for the purposes of calculating
        its chargeable gain in respect of that disposal.

(R)     Permutit UK is not a party to any arrangement or agreement under which
        any loss it may make on any disposal on or after Completion would be
        subject to the provisions of TCGA 1992, section 18(3) (transactions
        between connected persons).

(S)     Permutit UK is not a party to any arrangement or agreement under which
        it could be treated at any time after Completion as a limited partner
        for the purposes of TCGA 1992, section 55 (restriction on relief:
        companies).

(T)     No asset owned by Permutit UK is a wasting asset within TCGA 1992,
        section 44 (wasting assets) and there is no agreement or arrangement in
        existence under which it will (or, in the case of a put option, could)
        acquire any such asset.

(U)     Permutit UK does not own any rights, or any interest in rights, under a
        policy of assurance or contract for a deferred annuity on the life of
        any person of which it is not the original beneficial owner and there is
        no agreement or arrangement under which it
<PAGE>
 
                                       65


         will (or, in the case of a put option, could) acquire such a right or
         interest.

(V)     Permutit UK has not made any gain on any disposal where the tax
        chargeable in respect of the gain is deferred to the happening of any
        event after Completion other than the corporation tax on gains made in
        the accounting period ended 31st March 1995 which is payable by the
        Company nine months and one day after Completion.

(W)     Permutit UK does not own any shares in a company which has agreed to
        make at any time after Completion any such transfer as is referred to in
        TCGA 1992, section 125 (shares in a close company transferring assets at
        an under value) and there is no agreement or arrangement in existence
        under which it will (or, in the case of a put option, could) receive any
        asset by way of gift as mentioned in TCGA 1992, section 282 (gifts:
        recovery from donee).

(X)     There is no agreement or arrangement under which any transaction which
        Permutit UK is obliged (or, in the case of a put option, would be
        obliged) to carry out after Completion may be treated as a disposal of
        an asset by Permutit UK to which TCGA 1992, section 29 would apply.

(Y)     Permutit UK is not a party to any agreement or arrangement under which
        it could be obliged to make a disposal at any time on or after
        Completion to which the provisions of TCGA 1992, section 19 would apply
        to treat it as having received an amount of consideration which is
        greater than the actual amount of consideration it receives for the
        purposes of calculating its chargeable gain in respect of that disposal.

(Z)     The entering into of this agreement and Completion will not make
        Permutit UK liable to be assessed to Tax under any of the provisions of
        sections 179, 189 or 190, TCGA 1992.

(AA)    If Permutit UK disposed of each of its assets, or of any pool of assets
        (that is to say all those assets the aggregate of the expenditure
        relating to which would be taken into account in computing whether a
        balancing charge would arise on a disposal of any of those assets) for a
        consideration equal to their book value as shown or adopted for the
        purpose of the Completion Accounts, no balancing charge would arise in
        respect of any such asset or pool of assets under any legislation
        relating to capital allowances.

(BB)    Since the Accounts Date no accounting period (as defined in section 12,
        ICTA 1988) of Permutit UK has ended (as referred to in section 12(3),
        ICTA 1988).

(CC)    Permutit UK has not adopted and does not operate or is not part of any
        scheme approved or for which approval has been or is to be
<PAGE>
 
                                       66


        sought under section 202 ICTA 1988 (Charities: Payroll Deductions
        Scheme), Chapter III of Part V ICTA 1988 (Profit Related Pay) or Chapter
        IV of Part V ICTA 1988 (Share Option and Approved Profit Sharing
        Schemes).

(DD)    No agreement or arrangements exist whereunder Permutit UK may be obliged
        to make a payment at any time after Completion to which section 601,
        ICTA 1988 may apply.

(EE)    No tax relief for any contribution which may be made by Permutit UK to
        any pension scheme after Completion could be restricted under the
        provision of section 112 of the Finance Act 1993 by reference to
        contributions made in or provisions for contributions made (by Permutit
        UK or any other person) in respect of any period ending on or prior to
        Completion.

(FF)    Permutit UK has not agreed and is not obliged (contingently or
        otherwise) to surrender any amount in respect of any period not ended on
        or before Completion and has not received or agreed to receive any
        amount surrendered by any other company under, the provisions of
        sections 240, 402-403, 407-409 and 411-413, ICTA 1988 and it is not
        liable to make any payment for any amount surrendered by any other
        company under or in connection with the provisions of any of those
        sections.

(GG)    Permutit UK is not and, during or for the purposes of any period not
        ended before Completion, has not been a member of a partnership.

(HH)    Permutit UK is under no obligation to make a payment of rent, interest,
        annual payments or other sums of an income nature payable at any time
        after Completion which may be wholly or partially disallowable as
        deductions or charges in computing profits or against profits for Tax
        purposes by virtue of the provisions of sections 74, 125, 338, 339, 779,
        781-785 and 787, ICTA 1988, or otherwise on the basis that the business
        of Permutit is carried on in the same way as at Completion.

(II)    Permutit UK has not effected any demerger falling within sections 213 to
        218, ICTA 1988 under which any Group Company has been concerned in an
        exempt distribution (as defined in section 214(4) of ICTA 1988) and
        there are no arrangements by Permutit UK to effect any such demerger.

(JJ)    Permutit UK has not made any claim under section 140, TCGA 1992 in
        respect of the transfer of any trade carried on by it outside the United
        Kingdom and there are no arrangements by Permutit UK to make any such
        transfer or claim.

(KK)    On the basis that Permutit is not a company which falls within section
        704(D) ICTA 1988, Permutit UK has not within the last ten years repaid,
        redeemed or purchased or agreed to repay, redeem or
<PAGE>
 
                                       67


        purchase any of its share capital otherwise than by the receipt of new
        consideration (within the meaning of Part VI ICTA 1988).

(LL)    On the basis that Permutit is not a company which falls within Section
        704(D) ICTA 1988, Permutit UK has not within the last ten years
        capitalised or agreed to capitalise in the form of shares or debentures
        any profits or reserves of any class or description, or otherwise issued
        or agreed to issue share capital otherwise than wholly for new
        consideration (as defined in section 254 ICTA 1988).

(MM)    There is no obligation on Permutit UK to carry out at any time after
        Completion any transaction which would be a distribution or deemed
        distribution within the meanings of sections 209 or 210 ICTA 1988.

(NN)    Permutit UK is not and has not during the time which it has been a
        subsidiary of the Sellers been a close company for the purposes of
        United Kingdom Tax legislation and does not have any interest in and has
        never had during the time which it has been a subsidiary of the Seller
        any interest in a close company.

(OO)            (i)     Permutit UK is not a party to any scheme or arrangement
                        the whole or part of which is yet to be effected and
                        which is designed wholly or mainly for the purposes of
                        avoiding or deferring Tax.

                (ii)    Permutit UK is not under any obligation to carry out any
                        Transaction at any time after Completion to which the
                        provisions of sections 770, ICTA 1988 may be applied.

                (iii)   Permutit UK is not under any obligation or party to any
                        arrangements where it could realise a gain at any time
                        on or after Completion of a capital nature for the
                        purposes of section 776, ICTA 1988.

                (iv)    Permutit UK is not under any obligation or party to any
                        arrangements or arrangement whereunder it will (or, in
                        the case of a put option, could) be treated as obtaining
                        a tax advantage in consequence of any transaction in
                        securities effected at any time after Completion to
                        which the provisions of sections 703 to 709, ICTA 1988
                        could apply provided that the entering into of this
                        Share Purchase Agreement shall not be treated as such an
                        obligation or arrangement for the purposes of this
                        warranty.

(PP)    Permutit UK:

        (i)     is registered for the purposes of value added tax, has been so
                registered at all times that it has been required to be
<PAGE>
 
                                       68


                so registered, and such registration is not subject to any
                conditions imposed by or agreed with H M Customs and Excise;

        (i)     has complied fully with and observed in all material respects
                the terms of VAT legislation;

        (ii)    has maintained and obtained at all times complete, correct and
                up-to-date records, invoices and other documents appropriate or
                required for the purposes of VAT legislation and has preserved
                such records, invoices and other documents in such form and for
                such periods as are required by VAT legislation;

        (iii)   subject to any limitations applicable pursuant to section 25(7)
                VATA 94, obtains credit for all input tax paid or suffered by
                it;

        (iv)    is not and has not been treated as a member of a group for the
                purposes of VAT legislation, and has never applied for such
                treatment;

        (v)     is not required to make payments on account of value added tax
                for which it may become liable in a prescribed accounting period
                (pursuant to The Value Added Tax (Payments on Account)
                Regulations 1992); and

        (vi)    is not and has not been subject under VAT legislation to any
                penalty liability notice, written warning of failure to comply,
                surcharge liability notice or requirement to give security as a
                condition of making taxable supplies.

(QQ)    In respect of each of the assets of Permutit U.K. (if any) which is a
        capital item for the purpose of Part VA of the VAT (General) Regulations
        1985, the Disclosure Letter sets out accurately

        (i)     the capital item affected;

        (ii)    the amount of the total input tax (within the meaning of the
                said regulations) which is subject to adjustment;

        (iii)   the percentage of that input tax which was reclaimable on the
                capital item in the first interval applicable to it and any
                adjustments made having regard to events occurred up to the date
                hereof;

        (iv)    the date of acquisition of the capital item and the number of
                intervals in the adjustment period not ended on or before
                Completion;

        (v)     full particulars of all matters to date which are likely to be
                relevant in determining any adjustments which may be
<PAGE>
 
                                       69


                 required in respect of any periods not ended on or before
                 Completion.

(RR)            (i)     Permutit UK has both maintained and obtained full,
                        complete, correct and up-to-date records, invoices and
                        other documents appropriate or required for the purposes
                        of Customs Duty and Excise Duty.

                (ii)    Permutit UK has complied fully with all provisions of
                        the Tax legislation relating to Customs Duty and Excise
                        Duty and all directions and conditions made or imposed
                        pursuant thereto.

(SS)            (i)     Any exemption or relief obtained by Permutit UK from
                        capital duty under Part III Schedule 19, Finance Act
                        1973 or from stamp duty under section 55, Finance Act
                        1927 or section 42, Finance Act 1930 was properly
                        claimed and no such exemption or relief has become
                        liable to forfeiture.

                (ii)    All documents in the possession or under the control of
                        each Group Company or to the production of which any
                        Group Company is entitled and which establish or are
                        required to establish the title of such Group Company to
                        any asset which belongs to it have been stamped and any
                        applicable stamp duties or charges in respect of such
                        documents have been accounted for and paid, and there
                        are no such documents which are outside the United
                        Kingdom which would attract stamp duty if they were
                        brought into the United Kingdom.

(TT)    No Group Company is under any obligation or party to any arrangement to
        enter into any Transaction at any time on or after Completion in respect
        of which a charge to stamp duty reserve tax could arise.

(UU)    So far as the Sellers are aware, no Group Company is entitled to an
        interest in possession in settled property.

(VV)    Permutit UK is and always has been resident in the United Kingdom for
        United Kingdom Tax purposes. Permutit UK does not have any presence, for
        tax purposes, in any jurisdiction other then the United Kingdom, and is
        not a dual resident investing company for the purposes of section 404
        ICTA 1988.

(WW)    Neither Permutit Australia nor Permutit New Zealand have any presence,
        for the purpose of any United Kingdom Tax, in the United Kingdom and
        neither is a dual resident investing company for the purposes of section
        404 ICTA 1988.

(XX)    There are no circumstances in existence under which the Inland Revenue
        could make a direction under section 747, ICTA 1988
<PAGE>
 
                                       70


         pursuant to which any profits of any Group Company could be apportioned
         to Permutit U.K..

(YY)    Permutit UK does not, for the purposes of sections 757 to 760, ICTA
        1988, have a material interest in an offshore fund.

(ZZ)    No Group Company has carried out, been a party to, permitted to be
        carried out or is under any obligation to carry out any Transaction or
        series of Transactions for which consent (whether general or special)
        was or could be required pursuant to sections 765 to 767 ICTA 1988.

Warranties in respect of Permutit Australia

1.      The value adopted for the purposes of the Completion Accounts of
        Permutit Australia of each of its assets on the disposal of which a
        taxable profit or allowable loss could arise will not exceed the amount
        which would be deductible from the disposal proceeds in calculating the
        taxable profit or allowable loss.

2.      All expenditure which Permutit Australia has agreed to incur or
        consideration which Permutit Australia has agreed to give on or after
        Completion which will not be fully deductible in calculating the trading
        income of Permutit Australia for the period beginning immediately after
        Completion, is in respect of or in connection with an asset of Permutit
        Australia on the disposal of which a taxable profit or allowable loss
        could arise and all such expenditure incurred or consideration given
        would be fully deductible in calculating the taxable profit or allowable
        loss.

3.      Permutit Australia has properly operated the PAYE tax system and the
        fringe benefits tax system and has deducted tax from payments or
        benefits made or allowed to or treated as made or allowed to employees
        former employees or officers of Permutit Australia or from which tax
        should have been deducted in terms of the Income Tax Assessment Act 1936
        or the Fringe Benefits Tax Assessment Act 1986 and has accounted to the
        Commissioner of Federal or State Taxation for the tax deducted.

Warranties in respect of Permutit New Zealand

4.      No assessable income would arise if any capital asset of Permutit New
        Zealand were to be sold, disposed of or distributed for an amount equal
        to their book value adopted for the purposes of Completion Accounts,
        except any depreciation recapture under section 117 of the Taxes Act
        1976 or section EG 19 of the Income Tax Act 1994.

5.      All expenditure which Permutit New Zealand has agreed to incur or
        consideration which Permutit New Zealand has agreed to give on or after
        Completion which will not be fully deductible in
<PAGE>
 
                                       71

        calculating the assessable income of Permutit New Zealand for the period
        beginning immediately after Completion, is in respect of or in
        connection with the purchase of a fixed asset of Permutit New Zealand in
        respect of which a depreciation allowance would be available under
        section 108 of the Taxes Act 1976 or section EG 1 of the Income Tax Act
        1994.

6.      Permutit New Zealand has not at any time:

        (i)     obtained or sought to obtain a taxation advantage through any
                fraud or evasion; or

        (ii)    obtained a taxation advantage from any arrangement to which
                section 99 of the Taxes Act 1976 or section BB 9 or GB 1 of the
                Income Tax Act 1994 or section 76 of the Goods and Services Act
                1985 applies; or

        (iii)   made or entered into any arrangement, undertaking or scheme
                which was at the time it was entered into a sham or fiscal
                nullity.

7.      Permutit New Zealand:

        (i)     is a registered person for the purpose of the Goods and Services
                Tax Act 1985;

        (ii)    has complied in all respects with that Act; and

        (iii)   is not in default of any obligation to make any payment or
                return or notification under that Act.

8.      Permutit New Zealand has a balance date for New Zealand income tax
        purposes of 31st March of each year.

9.      Permutit New Zealand is not and, in respect of any period not ended on
        or before Completion, has not been, a branch or agent of any person not
        resident in New Zealand for New Zealand tax purposes.

11.     Disputes

(A)     None of the Group Companies nor any person for whose acts or defaults
        any Group Company might be vicariously liable is involved in litigation,
        prosecution, arbitration or any other proceedings for the enforcement of
        rights or settlement of disputes with the exception of the collection of
        debts in the ordinary course of business and so far as the Sellers are
        aware no act, omission or event has occurred which has given rise to a
        threat of such proceedings or which is likely to result in any Group
        Company being involved in any such proceedings; in particular (but
        without prejudice to the generality of the foregoing):-
<PAGE>
 
                                       72


        (i)     no breach of contract has been committed and no Group Company
                has otherwise failed to comply with the terms of any contract
                for which any Group Company is liable (either directly or
                vicariously) or which would cause damage to any Group Company,
                in each case where the loss to the Group Company is more than
                L15,000 Provided always that if there are a number of claims
                each less than such amount but together aggregating L100,000 or
                more, then they shall be treated as a single claim of more than
                L15,000; and

        (ii)    no Group Company is subject to any order or judgment given by
                any Court or governmental agency and has not been a party to any
                undertaking or assurance given to any Court or governmental
                agency which is still in force; and

        (iii)   no Group Company has received any notice of complaint or
                intended prosecution from the Financial Reporting Review Panel.

(B)     No proceedings have been served upon any Group Company in the last three
        years.

(C)     Since the Sellers acquired the Companies, there have been no situations
        with respect to any Group Company that involved or involve (i) the use
        of any corporate funds for unlawful contributions, unlawful gifts,
        unlawful entertainment or other unlawful expenses related to political
        activity or to any of the customers or suppliers of such Group Company,
        (ii) the making of any direct or as far as the Sellers are aware,
        indirect unlawful payments to government officials or others from
        corporate funds or the establishment or maintenance of any unlawful or
        unrecorded funds, (iii) the violation of any of the provisions of the
        Foreign Corrupt Practices Act of 1977 or any rules or regulations
        promulgated thereunder, (iv) the receipt of any illegal discounts or
        rebates or any other violation of anti-trust laws or (v) any
        investigation by any governmental body.

12.     Environmental

        Except as set out in the Disclosure letter:

        (i)     all Environmental Approvals have been obtained and complied with
                and are in full force and have been disclosed to the Purchaser;

        (ii)    there has been no material breach of any Environmental Approvals
                or Environmental Laws;

        (iii)   no statutory or, so far as the Sellers are aware, informal
                notices relating to Environmental Approvals, Environmental Laws
                or Environmental Matters have been received by any Group Company
                or the Sellers relating to any of the
<PAGE>
 
                                       73


                Properties or the conduct of the business of any Group Company
                at any of the Properties;

        (iv)    so far as the Sellers are aware no Environmental Liabilities
                exist and no proceedings or other actions of whatsoever nature
                are pending or threatened in relation to Environmental Approvals
                or Environmental Laws;

        (v)     so far as has come to the Sellers' knowledge during their period
                of ownership of each of the Properties, no underground storage
                tanks or vessels or any sort of underground storage system or
                pipelines (whether used or disused but excluding pipelines in
                relation to utilities) exist at any of the Properties.

13.     Information

        Any reference in this schedule (save where indicated to the contrary
below) to the awareness, knowledge or belief of the Sellers in relation to a
matter shall be deemed to constitute an additional statement that it has been
made after due and careful enquiry of (and solely of) the officers of each Group
Company and of the named individuals set out below.

                Neil Edkins             -    Managing Director
                Richard Astle           -    Production Manager 
                David Marsan            -    UK Sales Manager
                Mark Hodder             -    International Sales Manager  
                Keith Patton            -    Technical Manager
                Barry Clutton           -    Finance Manager
                Alison Anderson         -    International Project Manager
                Tom Kenny               -    Service Manager
                Nick Broomfield         -    Product Manager
                Patrick Bluett          -    Accounting
                Steve Jardine           -    Accounting
                Dimitri Lazarou         -    Gulf
                Terry Moore             -    Contracts Manager
                Steve Smith             -    Tax warranties only
                Richard Wheeler         -    Pensions warranties only
<PAGE>
 
                                       74

                                  SCHEDULE 3

               (Limitations on the Sellers' liability under the
                         Warranties and Undertakings)

                                 Contents List

I.      Agreements to which this schedule is applicable
II.     Warranties and Undertakings
III.    Limitations on liability under Warranties and Undertakings

        1.      Limitation on quantum
        2.      Time limits for bringing claim
        3.      Conduct of litigation
        4.      No liability if loss is otherwise compensated for 
                -       Purchaser can only claim once
                -       Taxation
                -       Insurances
                -       Recovery from third parties
        5.      Acts of Purchaser
        6.      Allowance, provision or reserve in the Accounts
        7.      Retrospective legislation
        8.      Taxation
        9.      Purchaser's knowledge

        10.     Information Memorandum and independent advice of Purchaser
        11.     Immovable Property

I.   Agreements to which this schedule is applicable

        Save to the extent there is provision specifically to the contrary the
parties intend that the provisions in this schedule apply both to the
Warranties and to the Tax Covenant (in addition to the limitations (if any) set
out in that document).  Accordingly, for the purposes of this schedule,
"Undertakings" shall mean any covenant or any undertaking given by or on behalf
of the Sellers in the Tax Covenant.

II.     Warranties and Undertakings

        Notwithstanding anything in this agreement to the contrary, the
provisions of this schedule shall operate to limit the liability of the Sellers
in respect of any claim by the Purchaser under the Warranties and/or
Undertakings, as applicable.

        For the avoidance of doubt, "Damages" includes any payment under any
Undertaking.
<PAGE>
 
                                       75

III.    Limitations on liability under Warranties and Undertakings

1.      Limitation on quantum

(A)     The Purchaser shall not be entitled in any event to damages in respect
        of any claim or claims under any of the Warranties (other than Tax
        Warranties unless and until and to the extent that the aggregate amount
        of all such substantiated claims and the amount by which the Net Asset
        Value as adjusted by the Margin Bank Differential (as adjusted) is less
        than L3,425,000 exceeds L300,000 in which case the relevant Seller shall
        be liable for the amount by which such aggregate exceeds L300,000.

        For the purposes of this clause, "substantiated" means a claim which is
        admitted or proved in a court of competent jurisdiction

(B)     The total aggregate liability of the Sellers under or pursuant to the
        Warranties and the Tax Covenant (whether for breach of the Warranties or
        claims under the Undertakings or otherwise) shall not in any event
        exceed the Purchase Price less any amount paid by the Sellers to the
        Purchaser in accordance with clause 5(I).

2.      Time limits for bringing claim

(A)     No claim shall be brought against the Sellers in respect of any breach
        of the Warranties or under any of the Undertakings unless the Purchaser
        shall have given to the relevant Seller written notice of such claim
        specifying (in reasonable detail in so far as it is available) the
        matter which gives rise to the breach or claim, the nature of the breach
        or claim and the amount claimed in respect thereof:

        (i)     on or before the 7th anniversary of the Accounts Date in respect
                of claims under the Tax Covenant or the Tax Warranties; or

        (ii)    on or before the date three years from the date hereof in
                respect of any claim under the Warranties relating to
                environmental matters; or

        (iii)   at any time after Completion in respect of any claim under the
                Warranties relating to the ownership of the Shares; or

        (iv)    on or before 31st July, 1997 (the "Warranty Claim Date") in
                respect of any other matters,

        PROVIDED that the liability of the relevant Seller under this paragraph
        shall absolutely determine (if such claim has not been previously
        satisfied, settled or withdrawn) if Proceedings in respect of such claim
        shall not have been commenced within two years of the service of such
        notice and, for this purpose, Proceedings shall not be deemed to have
        been commenced unless
<PAGE>
 
                                       76

        they shall have been properly issued and validly served upon the
        relevant Seller.

(B)     None of the limitations contained in paragraphs 1 and 2 shall apply to
        any breach of the Warranties which (or the delay in discovery of which)
        is the consequence of fraud or dishonest concealment, by any of the
        Sellers, or any of their officers or employees.

3.      Conduct of litigation

Upon the Purchaser or any member of the Group becoming aware of any claim,
action or demand against it or matter likely to give rise to the same, in
respect of the Warranties (other than the Tax Warranties), the Purchaser shall,
and shall procure that the relevant member of the Group shall:

        (i)     as soon as reasonably practicable notify the relevant Seller by
                written notice as soon as it appears to the Purchaser that the
                relevant Seller is or may become liable under such Warranties or
                that any assessment or claim of a third party received by the
                Purchaser may result in a claim under such Warranties;

        (ii)    subject to the relevant Seller indemnifying the Purchaser and/or
                the relevant member of the Group to their reasonable
                satisfaction against any liability, costs, damages or out of
                pocket expenses which may be incurred thereby, take such action
                and give such information and access to personnel, premises,
                chattels, documents and records to the relevant Seller and its
                professional advisers as the relevant Seller may reasonably
                request and the relevant Seller shall be entitled to require the
                relevant member of the Group to take such action and give such
                information and assistance in order to avoid, dispute, resist,
                mitigate, settle, compromise, defend or appeal any claim in
                respect thereof or adjudication with respect thereto;

        (iii)   subject to the proviso set out below, make no admission of
                liability, agreement, settlement or compromise with any third
                party in relation to any such claim or assessment without the
                prior written consent of the relevant Seller (such consent not
                to be unreasonably withheld or delayed); and

        (iv)    take all reasonable action to mitigate any loss suffered by it
                or any member of the Group in respect of which a claim could be
                made under such Warranties.

        PROVIDED THAT if the Sellers shall not make any request as to avoiding,
        disputing, resisting, appealing or compromising any claim within one
        month of being invited in writing to give
<PAGE>
 
                                       77

        instructions in relation to the same or within such lesser time period
        as shall be specified in such written invitation, being the requisite
        procedural time limit for avoiding, disputing, resisting, appealing or
        compromising (as appropriate) such claim, then the Purchaser may take
        any reasonable steps to settle the claim.

4.      Conduct of Tax Disputes

(A)     The Purchaser shall give notice to the Sellers of any Claim for Tax
        within seven Business Days of the Purchaser becoming aware thereof.

(B)     The Seller shall be entitled to resist any such Claim for Tax in the
        name of the Purchaser, the relevant member of the Purchaser's Group or
        the relevant Group Company, as the case may be, and to have made
        available information and documents of the relevant Group Company
        reasonably necessary for the purpose of such resistance provided that:

        (i)     the Purchaser, each member of the Purchaser's Group and each of
                the Group Companies which may be affected by the Claim for Tax
                is indemnified and secured to the Purchaser's satisfaction by
                the Sellers against all losses (including additional Tax
                Liability), costs (including reasonable compensation for the
                time spent by the Purchaser's Group or their officers,
                employees, agents and advisers), damages and expenses which may
                be incurred in resisting the Claim for Tax; and

        (ii)    the Sellers have been advised by an independent tax adviser,
                acceptable to the Purchaser in its reasonable discretion, after
                disclosure of all relevant information and documents, that it is
                reasonable to resist the Claim for Tax in the manner proposed by
                the Sellers.

(C)     The Sellers shall forfeit the right to resist any such Claim for Tax
        forthwith upon service of notice by the Purchaser:

        (i)     that it appears to the Purchaser that either the Sellers or any
                of the Group Companies committed at any time on or before
                Completion acts or were responsible for omissions which might
                constitute fraud; or

        (ii)    that the Purchaser considers that resistance to the Claim for
                Tax would prejudice a right or interest of a member of the
                Purchaser's Group; or

        (iii)   that the Purchaser has been advised by Queen's Counsel or, in
                relation to New Zealand, a legal practitioner experienced in
                taxation matters that it is unreasonable to resist the Claim for
<PAGE>
 
                                       78

        (iv)    that the Sellers have failed to comply with the provisions of
                this paragraph 4.

(D)     The right of the Sellers to resist Claim for Tax and the forfeiture of
        such right shall be without prejudice to the Indemnities contained in
        this agreement or the Deed of Tax Covenant.

(E)     The Purchaser shall be kept fully and promptly informed of all matters
        and all steps proposed to be taken by the Sellers and shall be entitled
        to receive from the Sellers copies of all correspondence in connection
        with any action taken by the Sellers pursuant to this clause in respect
        of any Claim for Tax.

(F)     The appointment of solicitors or professional advisers shall be subject
        to the prior approval and continuing approval of the Purchaser, such
        approval not to be unreasonably withheld or withdrawn.

(G)     All written communications which are to be transmitted to the relevant
        Tax Authority in connection with the Claim for Tax shall first be
        submitted to the Purchaser and shall not be despatched unless approval
        is given, such approval not to be unreasonably withheld.

(H)     The relevant member of the Purchaser's Group or the relevant Group
        Company (as the case may be) shall be at liberty without reference to
        the Sellers and on such terms as it may in its absolute discretion think
        fit to admit, compromise, settle, discharge or otherwise deal with any
        Claim for Tax if:

        (i)     within seven business days following the service of notice of
                that Claim for Tax on the Sellers pursuant to sub-paragraph (A)
                of this paragraph the Sellers fail to notify the Purchaser of
                their wish to resist the Claim for Tax; or

        (ii)    the Sellers serve a notice on the Purchaser to the effect that
                they do not or no longer wish to resist the Claim for Tax.


(I)     The Sellers shall be bound to accept for the purposes of this agreement
        and the Deed of Tax Covenant any admission, compromise, settlement or
        discharge of any Tax Liability and the outcome of any proceedings
        relating thereto, made or arrived at in accordance with the provisions
        of this paragraph 4.

(J)     Nothing in this paragraph 4 shall prevent any member of the Purchaser's
        Group or any Group Company from paying the Tax Liability (or any part of
        it) which is the subject of the Claim for Tax where the Tax Liability in
        question includes a liability to pay Tax.
<PAGE>
 
                                       79

(K)     If in respect of any Claim for Tax, any sum is recovered by the relevant
        Group Company or the Purchaser or any member of the Purchaser's Group
        from any Tax Authority as a result of any action taken under this clause
        (the "Recovery Amount"), the Purchaser will pay to the Sellers an amount
        equal to the Recovery Amount including any repayment supplement in
        respect of that Recovery Amount provided that the Recovery Amount may
        not exceed the aggregate of the amount paid in respect of the underlying
        Tax Liability under the Tax Covenant or the Tax Warranties to the
        Purchaser, each of the Purchaser's Group and each of the Group Companies
        under Clause 4(B) (i) and an amount equal to notional interest
        calculated at the Base Rate of National Westminster Bank PLC thereon as
        reduced by (i) any sums owed to the Purchaser under this Agreement or
        the Tax Covenant and (ii) any Tax Liability of the Purchaser in respect
        of the Recovery Amount and the repayment supplement.

5.      No liability if loss is otherwise compensated for

Purchaser can only claim once

(A)     The Purchaser and those deriving title from the Purchaser on or after
        Completion shall not be entitled to recover damages or otherwise obtain
        reimbursement or restitution more than once between them in respect of
        any individual breach of the Warranties or claim under the Undertakings.

(B)     No liability shall attach to the relevant Seller by reason of any breach
        of the Warranties to the extent that the same loss occasioned to the
        Purchaser or any member of the Group by reason of such breach has been
        recovered under the Undertakings and no liability shall attach to the
        relevant Seller under the Undertakings to the extent that the same loss
        has been recovered by a claim under the Warranties given by it.

(C)     The relevant Seller shall not be liable for breach of any of the
        Warranties nor to a claim under any of the Undertakings if and to the
        extent that the subject of the claim has been made good or is otherwise
        compensated for without cost or expense to the Purchaser or to any
        member of the Purchaser's Group or the Group.

Credit for tax benefits

(D)     If, at the request and expense of the Sellers, a chartered accountant
        appointed by the Purchaser and the Sellers by agreement, or failing
        agreement, on application by the Sellers, by the President for the time
        being of the Institute of Chartered Accountants in England and Wales or
        equivalent in other jurisdictions, shall certify that any Tax Liability
        in respect of which the Sellers have made a payment to the Purchaser
        under this agreement or the Tax Covenant, has or will give rise to a
        Relief
<PAGE>
 
                                       80

        for the relevant member of the Purchaser's Group or the relevant
        Group Company, then:-

        (i)     where the Relief has been utilised as a deduction from or offset
                against Tax, an amount equal to the amount of the Relief; and

        (ii)    where the Relief has been utilised as a deduction from or offset
                against income profits or gains an amount equal to the amount of
                Tax which has been saved;

        shall be dealt with in accordance with sub-clause(E) of this clause.

(E)     Where an amount (the "Relevant Amount") is to be dealt with under this
        sub-clause:-

        (i)     the Relevant Amount shall first be set off against any payment
                then due from the Sellers to the Purchaser under this agreement
                or the Tax Covenant; and

        (ii)    to the extent that there is an excess, an amount equal to the
                excess shall be paid by the Purchaser to the Sellers, within ten
                business days of demand.

Insurances

(F)     If and to the extent that, in respect of any matter which would give
        rise to a breach of the Warranties (other than the Tax Warranties), the
        Sellers shall not be liable for such breach to the extent the Group
        Companies could recover any amount under a reasonably prudent insurance
        policy (including a level of cover for professional indemnity reasonably
        considered appropriate by the Purchaser after consultation with the
        Sellers). The Sellers confirm that the insurance policies held by Group
        Companies prior to Completion were more than reasonably prudent having
        regard to the size and nature of the Thames Water Group and the fact
        that insurance is placed through a captive insurance company.

Recovery From Third Parties

(G)             (i)     Where the Purchaser and/or any member of the Group is at
                        any time entitled to recover from some other person
                        other than the Purchaser or a member of the Purchaser's
                        Group or any Tax Authority any sum in respect of any
                        matter giving rise to a claim under the Warranties
                        and/or Undertakings the Purchaser if requested to do so
                        and on being indemnified to its reasonable satisfaction
                        by the Sellers, shall, and shall procure that the
                        relevant member of the Group shall, undertake all
                        reasonably necessary steps (having regard, inter alia,
                        to the Purchaser's ongoing business interests) to
                        enforce such recovery and, in the event that the
<PAGE>
 
                                       81


                        Purchaser or any member of the Group shall recover any
                        amount from such other person, the amount of the claim
                        against the relevant Seller shall (if not paid) be
                        adjusted by the amount recovered or (if paid) the
                        Purchaser shall make a payment to the Seller in
                        accordance with sub-paragraph G(ii). The provisions of
                        this sub-paragraph (i) shall not affect the primary
                        liability of the Sellers to pay the Purchaser the amount
                        of any loss suffered. The Seller shall be obliged to pay
                        Purchaser the full amount of any loss suffered and,
                        where appropriate, the provisions of sub-paragraph
                        (G)(ii) shall apply following such payment.

        (ii)    If the relevant Seller has paid at any time to the Purchaser an
                amount pursuant to a claim in respect of the Warranties and/or
                the Undertakings and the Purchaser or any member of the Group is
                entitled to recover from some other person other than any Tax
                Authority or the Purchaser or a member of the Purchaser's Group
                any sum in respect of any matter giving rise to such claim, the
                Purchaser if requested to do so and on being indemnified to its
                reasonable satisfaction by the Sellers, shall, and shall procure
                that the relevant member of the Group shall take all reasonably
                necessary steps (having regard, inter alia, to the Purchaser's
                ongoing business interests) to enforce such recovery, and the
                Purchaser shall within 10 business days of recovery from such
                other person repay to the Seller so much of the amount recovered
                by the Purchaser or the relevant member of the Group from such
                other person less an amount equal to any Tax Liability the
                Purchaser or the relevant member of the Group in respect of the
                sum recovered from such other person PROVIDED THAT the amount
                repayable to the Sellers shall not exceed the sum recovered by
                the Purchaser from the Sellers under the claim for breach of
                Warranty and/or Undertaking.

        (iii)   If any amount is repaid to the Seller by the Purchaser or any
                member of the Group pursuant to sub-paragraph (G)(ii) above, an
                amount equal to the amount so repaid shall be deemed never to
                have been paid by the Seller to the Purchaser for the purposes
                of clause 1 (Limitation on quantum) of this schedule 3.

6.      Acts of Purchaser

        (i)     No claim shall lie against the Sellers under the Warranties
                (other than the Tax Warranties) to the extent that such claim is
                wholly or partly attributable to any act, omission, transaction,
                or arrangement carried out by any member of the Group after
                Completion which is outside the ordinary course of business and
                where the Sellers can show that the relevant Group Company acted
                in the knowledge that such act, omission, transaction or
                arrangement would cause or increase a loss for which a claim
                could be made against the
<PAGE>
 
                                       82


                Sellers PROVIDED that nothing in this clause shall prejudice the
                common law duty of the Purchaser to mitigate any loss.

        (ii)    The Sellers shall not be liable for any breach of Warranties or
                claim under the Undertakings to the extent that such breach or
                claim would not have arisen but for any changes after Completion
                in the accounting basis on which any member of the Group values
                its assets or any other change after Completion in accounting
                policy or practice of any member of the Group after Completion
                unless such change is required by law or is made to satisfy
                generally accepted accounting principles.

7.      Allowance, provision or reserve in the Completion Accounts

        The Seller shall not be liable for any breach of any of the Warranties
or claim under the Undertakings to the extent that a relevant allowance,
provision or reserve (whether general or specific) shall have been made in the
Completion Accounts.

8.      Retrospective legislation

        No liability shall arise in respect of any breach of any of the
Warranties or claim under the Undertakings if and to the extent that liability
for such breach or such claim occurs or is increased wholly or partly as a
result of any legislation not in force at the date hereof and not announced to
be introduced with effect from a date before Completion.

9.      Taxation

        The Seller shall not be liable in any event in respect of any breach of
the Warranties or claim under the Undertakings or the Tax Covenant in respect of
any Tax Liability:-

(A)     to the extent that provision or reserve in respect of that Tax Liability
        is made in the Completion Accounts; or

(B)     to the extent that the Tax Liability arises or is increased as a result
        of any increase in rates of Tax or any change in law or any change or
        withdrawal of any published extra-statutory concession or Statement of
        Practice by a Tax Authority being an increase, withdrawal or change
        made, in any such case, after Completion with retrospective effect and
        in each case not announced to be introduced with effect from a date
        before Completion; or

(C)     to the extent that that Tax Liability would not have arisen but for a
        voluntary transaction, action or omission carried out or effected by the
        Company at any time after Completion, other than any such transaction,
        action or omission carried out or effected under a legally binding
        commitment created on or before
<PAGE>
 
                                       83

        Completion or any action the Purchaser takes at the request of the
        Sellers under any of the following clauses: Conduct of Tax Disputes (4),
        Tax Returns (10) Surrender of Group Relief (11) Recovery from Third
        Parties 5(G) and Mitigation (12); or

(D)     to the extent that that Tax Liability arises by reason of a voluntary
        disclaimer by the Company after Completion of the whole or part of any
        Relief or by reason of a voluntary revocation by the Company after
        Completion of any claim for Relief made (whether provisionally or
        otherwise) prior to Completion; or

(E)     to the extent that any Income, Profits or Gains to which that Tax
        Liability is attributable were actually earned or received by or
        actually accrued to the Company but were not (in either such case)
        reflected in the Completion Accounts except to the extent that the Tax
        Liability exceeds the amount of the aforementioned Income, Profit or
        Gains; or

(F)     to the extent that that Tax Liability arises or is increased as a
        consequence of any failure by the Purchaser or the Company to comply
        with any of their respective obligations under 4 (Conduct of Tax
        Disputes), 10 (Tax Returns), 11 (Surrender of Group Relief) or
        Mitigation (12); or

(G)     to the extent that that Tax Liability would not have arisen but for a
        cessation of, or a major change in the nature or conduct of, any trade
        carried on by the Company, being a cessation or change occurring after
        Completion; or

(H)     to the extent that the Tax Liability arises or increases as a result of
        any changes after Completion in the bases, methods or policies of
        accounting of the Purchaser or any of the Group Companies unless such
        change is required as a result of any Group Company failing to satisfy
        generally acceptable accountancy practices, standards and principles as
        in existence at Completion.

10.     Tax Returns

        (A)     The Sellers shall be entitled and they or their duly authorised
                agents shall, at the Sellers cost, in respect of all periods
                ending or ended on or before Completion, prepare and submit, in
                accordance with the applicable law, all returns of the Group
                Companies for the purposes of all Taxes and all claims,
                elections, surrenders, disclaimers, notices and consents
                required by law to be submitted in connection with such returns.

        (B)     The Purchasers shall procure that each Group Company shall
                following Completion:
<PAGE>
 
                                       84

                (i)     afford, at the Sellers' cost, the Sellers and their duly
                        authorised agents access to the Group Companies'
                        documents and records to prepare and submit the said
                        returns, claims, elections, surrenders, disclaimers,
                        notices and consents; and

                (ii)    subject to being reasonably satisfied that the
                        documentation in question is accurate, prepared in
                        accordance with the applicable law and will not result
                        in any Group Company or any member of the Purchaser's
                        Group or any officer or employee or agent of any such
                        company committing an offence, complete and execute such
                        documentation as the Sellers may reasonably request in
                        connection with or for the purposes of the Sellers'
                        obligations under clause 10(A). No provision in this
                        sub-clause 10(B)(ii) will affect the Purchaser's or any
                        Group Company's rights against the Sellers or the
                        Sellers' Guarantor under any provision of this Agreement
                        or the Tax Covenant.

        (C)     The Purchaser agrees that neither it nor any member of its Group
                will not voluntarily disturb any returns which are agreed with
                the relevant Tax Authorities pursuant to this clause.

11.     Surrender of Group Relief 

(A)     The Purchaser shall, on being reasonably indemnified or all professional
        costs it may reasonably and property incur, procure that Permutit UK
        shall surrender to any member of the Retained Group as the Sellers may
        at their sole discretion specify all such trading losses described in
        section 403 ICTA 1988 ("Group Relief") available for potential surrender
        by Permutit UK to any member of the Retained Group pursuant to Chapter
        IV of Part X ICTA 1988 and which relate to any accounting period of the
        Company ended on or before Completion.

(B)     The Purchaser hereby undertakes that it shall, and shall procure that
        Permutit UK will, complete and execute all such documentation as is
        reasonably required to give full effect to the surrenders to be made
        under sub-clause (A) and that such surrenders are allowed in full by the
        Inland Revenue and (without prejudice to the generality of the
        foregoing) the Purchaser shall procure that the Company shall sign and
        submit to the Inland Revenue all such notices of consent to surrender
        (including provisional or protective notices of consent in cases where
        any relevant Tax computation has not yet been agreed).

(C)     In consideration of each of the surrenders to be made under sub-clause
        (A), the Sellers shall pay to Permutit UK, a sum equal to the amount of
        corporation tax from which the company that is the claimant company in
        respect of such surrender has been
<PAGE>
 
                                       85


        relieved by virtue of that surrender being validly and effectively
        made.

(D)     Any sum payable under sub-clause (C) shall be paid on the date on which
        any corporation tax chargeable on the taxable profits of the company
        that is the claimant company in respect of the surrender in question for
        the accounting period of its to which that surrender relates becomes due
        and payable (or would have become due and payable had the claimant
        company incurred any liability to corporation tax in respect of that
        accounting period).

(E)     In the event that any payment is made in accordance with the foregoing
        provisions of this clause in respect of any surrender of Group Relief
        made under sub-clause (A) and corporation tax falls nevertheless to be
        charged in respect of the taxable profits that the relevant surrender
        was intended to relieve from such tax (whether as a result of the Inland
        Revenue refusing to allow Group Relief or subsequently withdrawing Group
        Relief in respect of the relevant surrender or for any other reason
        whatsoever), the Purchaser shall procure that Permutit UK shall within
        five Business Days of the demand repay to the Sellers or to the relevant
        subsidiary or subsidiaries of the Sellers either the sum previously paid
        in respect of the relevant surrender in accordance with the foregoing
        provisions of this clause or, as the case may be, such part of that sum
        as is attributable to the element of the surrender that did not have the
        effect of relieving from corporation tax the taxable profits intended to
        be relieved by virtue of that surrender PROVIDED THAT where the receipt
        of the sum previously paid to Permutit UK was or will be taken into
        account in calculating a Tax Liability of Permutit UK, the amount
        repayable will be equal to the sum previously paid less the Tax
        Liability.

12.     Mitigation

(A)     To the extent that Permutit U.K. uses any of its Reliefs which has not
        been treated as an asset or taken into account in calculating any
        provision in the Completion Accounts and which has arisen prior to
        Completion to reduce or eliminate any Tax Liability in respect of which
        the Purchaser would have been able to make a claim against the Sellers
        or any of them under the Tax Warranties or the Tax Covenant it shall not
        be entitled to make such claim under the Tax Warranties or the Tax
        Covenant in respect of that Tax Liability provided that nothing in this
        clause shall require the Purchaser to utilise such Relief in priority to
        any Relief arising after Completion.

(B)     The Purchaser agrees that Permutit UK shall not utilise any of its
        Reliefs arising prior to Completion and which is not treated as an asset
        or taken into account in calculating any provision in the Completion
        Accounts to set off against income, profits or
<PAGE>
 
                                       86


        gains or any Tax Liability arising after Completion until the expiry of
        two years after Completion unless it is in accordance with sub-clause
        (A) above.

13.     Information Memoranda and independent advice of Purchaser

        The Purchaser acknowledges and agrees with the Seller (for themselves
and for the benefit of their officers, employees and advisers and as trustees
for such officers, employees and advisers) that:

(A)     save to the extent expressly provided to the contrary herein, the
        invitation to it by the Seller to consider the purchase of the Shares
        and the provision of information relating to the Group, its undertaking,
        financial position or prospects (including, in particular but without
        limitation, the information contained in the Information Memoranda), was
        made by the Seller and accepted by the Purchaser, and this agreement is
        entered into, on the basis and condition that no member of the Retained
        Group nor any of the officers, employees and advisers of each member of
        the Retained Group has made or makes any representation or warranty as
        to the accuracy or completeness of such information, or accepts any duty
        of care in relation to the Purchaser in respect of the provision of such
        information and that none of such persons shall be under any liability
        to the Purchaser in the event that, for whatever reason, such
        information (including, in particular but without limitation, the
        information contained in the Information Memoranda) is or becomes
        inaccurate, incomplete or misleading; and

(B)     the Purchaser has received independent legal and financial advice
        relating to the purchase of the Shares and to the terms of this
        agreement and the documents to be executed pursuant to it, including the
        terms of this paragraph.

14.     Immovable Property and the Environment

(A)     The Sellers shall not be liable under the Warranties other than that
        contained in clause 6 of schedule 2 or the Tax Warranties to the extent
        that the subject of the claim relates to the ownership, occupation
        and/or use of Immovable Property owned, occupied and/or used by the
        Company.

(B)     The Sellers shall not be liable under the Warranties other than those
        contained in clause 11 of schedule 2 to the extent that the subject of
        the claim relates to Environmental Matters or Environmental Liabilities.
        This sub-clause 14(B) of schedule 3 prevails over sub-clause 14(A) of
        schedule 3.

15.     Group Netting Agreement

(A)     Permutit UK has no liability (whether actual or contingent) under
<PAGE>
 
                                       87

        the Composite Accounting System Agreement and Deed of Guarantee given in
        favour of National Westminster Bank plc ("Nat West") dated 5th May 1994
        ("the Guarantee").

(B)     Nat West has not prior to 30th March 1995 exercised any of its rights
        under the guarantee contained in the Guarantee.

(C)     No security has been given or payment made by any person in connection
        with the release of the Guarantee by Nat West dated 30th March 1995 and
        annexed to the Disclosure Letter.
<PAGE>
 
                                       88

SIGNED by                  )                                 
for and on behalf of       )
THAMES WATER PRODUCTS AND  )                        Janet Ravenscroft
SERVICES LIMITED           )





SIGNED by                  )
for and on behalf of       )
PWT OVERSEAS LIMITED       )                        Janet Ravenscroft





SIGNED by                  )
for and on behalf of       )
IONPURE TECHNOLOGIES       )                        Ian Gallantree      
                           )





SIGNED by                  )
for and on behalf of       )                        Janet Ravenscroft
THAMES WATER PLC           )





SIGNED by                  )                        
for and on behalf of       )
UNITED STATES FILTER       )                        Ian Gallantree
CORPORATION                )  


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission