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: Baillie Gifford & Co 4. Full name of shareholder(s) (if different from 3.): 5. Date of the transaction (and date on which the threshold is crossed or reached if different): 23 FEBRUARY 2009 6. Date on which issuer notified: 24 FEBRUARY 2009 7. Threshold(s) that is/are crossed or reached: 5% 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 Ordinary Shares 12,584,520 5.92% GB00B07V4P80 Resulting situation after the triggering transaction Class/type of shares if possible using Number of Number of voting % of voting the ISIN CODE shares rights rights Direct Indirect Direct Indirect Ordinary Shares BELOW 5% BELOW 5% BELOW 5% GB00B07V4P80 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 BELOW 5% BELOW 5% 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: In the narrative below, the figures in [ ] indicate the amount of voting rights and the percentage held by each controlled undertaking where relevant. Baillie Gifford & Co, a discretionary investment manager, is the parent undertaking of an investment management group. Its wholly-owned subsidiary undertaking Baillie Gifford Overseas Limited [436,200; 0.2%] is also a discretionary investment manager. Its wholly-owned subsidiary undertaking Baillie Gifford & Co Limited [147,891; 0.1%] is an OEIC Authorised Corporate Director and Unit Trust Manager which has delegated its discretionary investment management role to Baillie Gifford & Co. Its wholly-owned subsidiary undertaking Baillie Gifford Life Limited [848,400; 0.4%] is a life assurance company which procures discretionary investment management services from Baillie Gifford & Co in respect of its own account shareholdings. 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

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