Holding(s) in Company

Cookson Group PLC 08 August 2002 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 - 15,238,356 SHARES CHASE GA GROUP NOMINEES LTD - 28,762,043 SHARES CUIM NOMINEE LIMITED - 10,832,325 SHARES RBSTB NOMINEES LIMITED - 1,569,584 SHARES 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 NOT DISCLOSED 8) Percentage of issued class NOT DISCLOSED 9) Class of security ORDINARY SHARES OF 1 PENCE EACH 10) Date of transaction 7 AUGUST 2002 11) Date company informed 8 AUGUST 2002 12) Total holding following this notification 56,402,308 SHARES 13) Total percentage holding of issued class following this notification 7.75% 14) Any additional information 15) Name of contact and telephone number for queries ALAN WALLWORK, ASST COMPANY SECRETARY, COOKSON GROUP PLC - TEL: 020 7766 4537 16) Name and signature of authorised company official responsible for making this notification ALAN WALLWORK, ASST COMPANY SECRETARY, COOKSON GROUP PLC Date of notification: 8 AUGUST 2002 This information is provided by RNS The company news service from the London Stock Exchange

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