REG-Cookson Group PLC: Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES

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

COOKSON GROUP PLC

2. Reason for the notification (please state Yes/No):

An acquisition or disposal of voting rights: ( Yes)

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 the notification obligation:

Lloyds Banking Group plc

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

See Section 9

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

24 JUNE 2009

6. Date on which issuer notified:

25 JUNE 2009

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

Direct/Indirect decrease to below 6%

8. Notified details:

……………..

A: Voting rights attached to shares

Class/type of shares if possible Situation previous to the
using the ISIN CODE Triggering transaction

Number of shares Number of voting
Rights

Ord £1 Shares 19,148,086 19,148,086

GB00B3WK5475

Resulting situation after the triggering transaction

Class/type of shares if possible Number of Number of voting % of voting
using the ISIN CODE shares rights rights

Direct Direct Indirect Direct Indirect

Ordinary Shares 1,913,184 1,913,184 14,475,436 0.692 5.237

GB00B3WK5475

B: Financial Instruments

Resulting situation after the triggering transaction

Type of Expiration Exercise/ Number of voting rights that may be % of
financial Date Conversion acquired if the instrument is voting
instrument Period/ Date exercised/ converted. rights

N/A

Total (A+B)

Number of voting % of voting
rights rights

16,388,620 5.93

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

11,843,484 shares (4.285%) are held by State Street Nominees Ltd. Shares are
under the control of Scottish Widows Investment Partnership Ltd, a wholly owned
subsidiary of Scottish Widows Group Ltd, a wholly owned subsidiary of Lloyds
TSB Bank plc, a wholly owned subsidiary of Lloyds Banking Group plc (Indirect
Interests).

4,286,235 shares (1.551%) are under the control of Insight Investment
Management (Global) Limited, a wholly owned subsidiary of Insight Investment
Management Limited, a wholly owned subsidiary of HBOS Insurance & Investment
Group Limited, a wholly owned subsidiary of HBOS plc, a wholly owned subsidiary
of Lloyds Banking Group plc (Indirect Interests).

Proxy Voting:

10. Name of the 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:

N/A

14. Contact name:

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC

15. Contact telephone number:

+ 44 (0) 20 7822 0000

END