Holding(s) in Company

Cookson Group PLC 19 November 2007 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: LEGAL & GENERAL GROUP PLC (L&G) 4. Full name of shareholder(s) (if different from 3.): LEGAL & GENERAL ASSURANCE (PENSIONS MANAGEMENT) LIMITED (PMC) 5. Date of the transaction (and date on which the threshold is crossed or reached if different): 14 NOVEMBER 2007 6. Date on which issuer notified: 19 NOVEMBER 2007 7. Threshold(s) that is/are crossed or reached: FROM 3% - 4% (L&G) 8. Notified details: ................. A: Voting rights attached to shares Class/type of shares if possible Situation previous to the Triggering transaction using the ISIN CODE Number of shares Number of voting Rights ORD GBP 0.10 7,898,514 7,898,514 Resulting situation after the triggering transaction Class/type of shares if Number of shares Number of voting rights % of voting rights possible using the ISIN CODE Direct Direct Indirect Direct Indirect ORD GBP 0.10 8,529,250 8,529,250 4.01 B: Financial Instruments Resulting situation after the triggering transaction Type of Expiration Date Exercise/Conversion Number of voting rights % of voting rights financial Period/ Date that may be acquired if the instrument instrument is exercised/ converted. N/A Total (A+B) Number of voting rights % of voting rights 8,529,250 4.01 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: Legal & General Group Plc (Direct and Indirect) (Group) Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct and Indirect) Legal & General Investment Management Limited (Indirect) (LGIM) Legal & General Group plc (Direct) (L&G) (8,529,250 - 4.01% = LGAS, LGPL & PMC) Legal & General Investment Management (Holdings) Legal & General Insurance Holdings Limited (Direct) Limited (Direct) (LGIMHD) (7,515,664 - 3.54% = PMC) (LGIH) Legal & General Assurance (Pensions Management) Legal & General Assurance Society Limited (LGAS & LGPL) Limited (PMC) (7,515,664 - 3.54% = PMC) Legal & General Pensions Limited (Direct) (LGPL) 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: This notification has been delayed due to the large number of disclosures required following a substantial amount of new business which came to Legal & General in the form of an in-specie transfer. 14. Contact name: RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC 15. Contact telephone number: 020 7822 0000 This information is provided by RNS The company news service from the London Stock Exchange

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