TR-1: Notification of Major Interest in Shares

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

AEA Technology plc

2. Reason for notification (please tick the appropriate box or boxes)

An acquisition or disposal of voting rights

x

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached 

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

3. Full name of person(s) subject to notification obligation:

Schroders plc

4. Full name of shareholder(s) (if different from 3):

5. Date of transaction and date on which the threshold is crossed or reached:

17/06/09

6. Date on which issuer notified:

18/06/09

7. Threshold(s) that is/are crossed or reached:

19%-20%

8: Notified Details

A: Voting rights attached to shares

Class/type of shares

If possible use ISIN code

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of shares

Number of voting rights

Number of shares

Number of voting rights

Percentage of voting rights

Direct

Direct

Indirect

Direct

Indirect

Ordinary

GB0031793945

45,013,082

45,013,082

N/A

N/A

46,679,749

N/A

20.40%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ conversion period 

No. of voting rights that may be acquired if the instrument exercised/converted

Percentage of voting rights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Exercise price

Expiration date 

Exercise/ conversion period

No. of voting rights instrument refers to

Percentage of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

46,679,749

20.40%

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable:

Schroder Investment Management Limited    45,910,465    20.06%

Schroder Investment Management North America Limited    769,284    0.34%

Proxy Voting:

10. Name of the proxy holder:

11. Number of voting rights proxy holder will cease to hold:

12. Date on which proxy holder will cease to hold voting rights:

13. Additional information:

The shares referred to in section 9 are held in portfolios managed by those firms on a discretionary basis for clients under investment management agreements.

14. Contact name:

Andrea Rowe

15. Contact telephone name:

020 7658 6000