Holding(s) in Company

Cookson Group PLC 28 January 2005 SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1) Name of company COOKSON GROUP PLC 2) Name of shareholder having a major interest MORLEY FUND MANAGEMENT LIMITED (A subsidiary of AVIVA PLC) AND AVIVA PLC 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 BNY NORWICH UNION NOMINEES LTD - 20,999,678 SHARES CHASE GA GROUP NOMINEES LTD - 31,247,043 SHARES CHASE NOMINEES LTD - 2,122,000 SHARES CUIM NOMINEE LIMITED - 21,721,461 SHARES 5) Number of shares/amount of stock acquired 1,097,972 6) Percentage of issued class 0.06% 7) Number of shares/amount of stock disposed N/A 8) Percentage of issued class N/A 9) Class of security ORDINARY SHARES OF 1 PENCE EACH 10) Date of transaction 27 JANUARY 2005 11) Date company informed 28 JANUARY 2005 12) Total holding following this notification 76,090,182 SHARES 13) Total percentage holding of issued class following this notification 4.01% 14) Any additional information 15) Name of contact and telephone number for queries RACHEL BENJAMIN, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC - TEL: 020 7061 6565 16) Name and signature of authorised company official responsible for making this notification RACHEL BENJAMIN, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC Date of notification: 28 JANUARY 2005 This information is provided by RNS The company news service from the London Stock Exchange

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