RNS Number:8543O
AEA Technology PLC
20 August 2003


                  DEALINGS BY SUBSTANTIAL SHAREHOLDERS


1)   NAME OF COMPANY
AEA TECHNOLOGY PLC


2)   NAME OF SHAREHOLDER HAVING A MAJOR INTEREST
SCHRODER INVESTMENT MANAGEMENT LIMITED


3)   Please state whether notification indicates that it is in respect of 
     holding of the Shareholder named in 2 above or in respect of a 
     non-beneficial interest or in the case of an individual holder if it is a
     holding of that person's spouse or children under the age of 18
RE 2


4)   Name of the registered holder(s) and, if more than one holder, the 
     number of shares held by each of them.
SEE BELOW


5)   Number of shares/amount of stock acquired.
NOT KNOWN


6)   Percentage of issued Class
NOT KNOWN


7)   Number of shares/amount of stock disposed
N/A


8)   ( N/A %) of issued Class


9)   Class of security
ORDINARY #0.122


10)  Date of transaction
NOT KNOWN


11)  Date company informed
19 AUGUST 2003


12)  Total holding following this notification
16,022,320

               
13)  Total percentage holding of issued class following this notification
23.743%


14)  Any additional information
SEE BELOW


15)  Name of contact and telephone number for queries
KEITH RUSSELL 01235 433195


16)  Name and signature of authorised company official responsible for 
     making this notification

     Date of Notification
19/8/2003


Letter to AEA Technology Plc
Dated 19 August 2003

10P ORDINARY SHARES ("SHARES")

We write to advise you that we, Schroder Investment Management Limited, have an 
interest in 14,455,329 shares which are held in portfolios managed by us on a 
discretionary basis for clients under investment management agreements.

Included in this figure are:-

(i)    947,155 shares registered or to be registered in the name of our 
       wholly-owned subsidiary nominee company, Schroder Nominees Limited 
       (Schroder Nominees),

(ii)   6,250,001 shares held in (a) unit trust(s) operated and managed by an 
       affiliated company, Schroder Unit Trusts Limited (SUTL), and registered 
       or to be registered in the name of Chase Nominees Limited.

(iii)  7,258,173 shares neither registered nor to be registered in the name of 
       Schroder Nominees Limited. The registration details are shown on schedule 
       A below.

An affiliated company, Schroder Investment Management North America Inc (SIMNA 
Inc), is managing a portfolio holding a further 1,566,991 shares. These shares 
are registered or to be registered in the name of Chase Nominees Limited.

We believe that we, our subsidiary and affiliated company are therefore 
interested in an overall aggregate of 16,022,320 shares, representing some 
23.743% of the total number of shares in issue, namely 67,483,052.

This notification is made to you:-

(a) in respect of our interest as investment managers,

(b) on behalf of SIMNA Inc, SIMNA Ltd and SUTL in relation to the interests they 
    are treated as having respectively under the Companies Act 1985 (the Act), 
    and

(c) on behalf of Schroders plc., our holding company, which is treated as having 
    an interest in all of the above shares under the Act by virtue of its 
    ownership of SIMNA Inc, SUTL and ourselves.


 
                         SCHEDULE A 
                      AEA TECHNOLOGY PLC 
                     10P ORDINARY SHARES
 
REGISTRATION                                         AMOUNT

Banque Internationale a Luxembourg S                 26,902
British Coal Staff Superannuation a/c: P          2,586,290 
Chase Nominees Limited                              607,689 
Chase Manhattan Bank                                208,715 
Imperial Pensions Nominees Limited                  695,454 
Mineworkers' Pension Scheme a/c: R                2,562,123 
Morgan Nominees Ltd                                  90,818 
Nortrust Nominees Ltd                               360,728 
Nutraco Nominees Ltd a/c: GWPPMPS                   119,454

                                                  7,258,173
     

Letter from Schroder Investment Management Limited


                      This information is provided by RNS
            The company news service from the London Stock Exchange

END

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