Holding(s) in Company

Cookson Group PLC
18 April 2005

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1) Name of company

COOKSON GROUP PLC

2) Name of shareholder having a major interest

FMR Corp. & FIDELITY INTERNATIONAL LIMITED

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

NON-BENEFICIAL INTEREST

4) Name of the registered holder(s) and, if more than one holder, the
number of shares held by each of them

REGISTERED NAME                        MANAGEMENT COMPANY                                      NUMBER OF SHARES
BROWN BROS HARRIMN LTD LUX             FIDELITY INTERNATIONAL LIMITED                             77,728,869
NORTHERN TRUST LONDON                  FIDELITY INTERNATIONAL LIMITED                              368,260
JP MORGAN, BOURNEMOUTH                 FIDELITY INVESTMENT SERVICES LIMITED                       1,485,432
JPMORGAN CHASE BANK                    FMR CORP                                                     30,000
JP MORGAN, BOURNEMOUTH                 FIDELITY PENSION MANAGEMENT                                5,639,547
NORTHERN TRUST LONDON                  FIDELITY PENSION MANAGEMENT                                 311,955

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

26,024,513

8) Percentage of issued class

1.37%

9) Class of security

ORDINARY SHARES OF 1 PENCE EACH

10) Date of transaction

NOT DISCLOSED

11) Date company informed

18 APRIL 2005

12) Total holding following this notification

85,564,063 SHARES

13) Total percentage holding of issued class following this notification

4.51%

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: 18 APRIL 2005


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