Holding(s) in Company

Cookson Group PLC 16 March 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: LLOYDS TSB GROUP PLC 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): N/A 6. Date on which issuer notified: 16 MARCH 2007 7. Threshold(s) that is/are crossed or reached: N/A 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 BO7V4P8 N/A N/A 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 BO7V4P8 6,902,908 6,902,908 102,327 3.568 0.053 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. Total (A+B) Number of voting rights % of voting rights 7,005,235 3.621 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: 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: 14. Contact name: RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC 15. Contact telephone number: + 44 (0)20 7822 0000 This information is provided by RNS The company news service from the London Stock Exchange

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