Holding(s) in Company

Cookson Group PLC 07 September 2006 SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1) Name of company COOKSON GROUP PLC 2) Name of shareholder having a major interest STANDARD LIFE GROUP 3) Please state whether notification indicates that it is in respect of holding of the shareholder named in 2 above or in respect of a non-beneficial interest or in the case of an individual holder if it is a holding of that person's spouse or children under the age of 18 AS ABOVE 4) Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them VIDACOS NOMINEES 5) Number of shares/amount of stock acquired N/A 6) Percentage of issued class N/A 7) Number of shares/amount of stock disposed 430,700 8) Percentage of issued class 0.22% 9) Class of security ORDINARY SHARES OF 10 PENCE EACH 10) Date of transaction 6 SEPTEMBER 2006 11) Date company informed 7 SEPTEMBER 2006 12) Total holding following this notification 24,688,007 SHARES 13) Total percentage holding of issued class following this notification 12.81% 14) Any additional information N/A 15) Name of contact and telephone number for queries RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC - TEL: 020 7822 0062 16) Name and signature of authorised company official responsible for making this notification RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC Date of notification: 7 SEPTEMBER 2006 This information is provided by RNS The company news service from the London Stock Exchange

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