TR-1: Notifications of Major Interests 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 (yes/no)

An acquisition or disposal of voting rights

X

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

An event changing the breakdown of voting rights

Other (please specify):______________

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

Prudential plc group of companies

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

JP MORGAN NOMINEES    2,435,037

NORTRUST NOMINEE LTD A/C MHF01    34,790

NORTRUST NOMS LTD    203,979

PRUCLT HSBC GIS NOM(UK) PAC AC    4,939,490
PRUCLT HSBC GIS NOM(UK) PPL AC    4,562,664

NORTRUST NOMINEE LTD A/C MKK01    30,961,591*

(*These shares relate to M&G Investments Funds 3, an OEIC Fund managed by M&G Investment Management Limited, a wholly owned subsidiary of Prudential plc)

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

11 August 2008

6. Date on which issuer notified:

13 August 2008

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

19%

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

Indirect

Direct

Indirect

GB0031793945

40,318,635

40,318,635

43,137,551

43,137,551

19.30%

B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ conversion period/date 

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

Percentage of voting rights

N/A

N/A

N/A

N/A

N/A

Total (A+B)

Number of voting rights

Percentage of voting rights

43,137,551

19.30%

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

Prudential plc (parent Company)

M&G Group Limited (wholly owned subsidiary of Prudential plc)

M&G Limited (wholly owned subsidiary of M&G Group Limited)

M&G Investment Management Limited (wholly owned subsidiary of M&G Limited)

M&G Securities Limited (wholly owned subsidiary of M&G Limited)

The Prudential Assurance Company Limited (wholly owned subsidiary of Prudential plc)

Proxy Voting:

10. Name of proxy holder:

N/A

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

N/A

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

N/A

13. Additional information:

M&G Investments Funds 3 is an Open Ended Investment Company (OEIC) and is not a Prudential group company. 

The OEIC is managed by M&G Investment Management Limited (a wholly owned subsidiary of Prudential plc) that has direct fund management control over the 30,961,591 shares held by NORTRUST NOMINEE LTD A/C MKK01

14. Contact name:

Dipesh Varsani

M&G Investment Management Limited

15. Contact telephone name:

020 7548 3261