Holding(s) in Company

Cookson Group PLC
21 July 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                             6,032,000
NORTHERN TRUST LONDON                  FIDELITY INTERNATIONAL LIMITED                               28,000
JP MORGAN, BOURNEMOUTH                 FIDELITY INVESTMENT SERVICES LIMITED                        787,949
JPMORGAN CHASE BANK                    FMR CORP                                                     3,000
JP MORGAN, BOURNEMOUTH                 FIDELITY PENSION MANAGEMENT                                 431,000
NORTHERN TRUST LONDON                  FIDELITY PENSION MANAGEMENT                                  24,000

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 10 PENCE EACH

10) Date of transaction

NOT DISCLOSED

11) Date company informed

21 JULY 2005

12) Total holding following this notification

7,305,949 SHARES

13) Total percentage holding of issued class following this notification

3.85%

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: 21 JULY 2005


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