Holding(s) in Company

Cookson Group PLC
13 August 2004

                                  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

STATE STREET NOMINEES LTD.         FIDELITY MANAGEMENT 
                                   TRUST COMPANY                 147,200

MELLON BANK                        FIDELITY MANAGEMENT 
                                   TRUST COMPANY                 145,100

CHASE NOMINEES LTD.                FIDELITY MANAGEMENT 
                                   TRUST COMPANY                 108,100

CHASE NOMINEES LTD.                FIDELITY INVESTMENT 
                                   SERVICES LTD.              85,371,234

CHASE MANHATTAN BANK LONDON        FIDELITY INVESTMENT 
                                   SERVICES LTD.              10,758,002

RBS TRUST BANK                     FIDELITY PENSION 
                                   MANAGEMENT                    754,695

BT GLOBENET NOMINEES LTD.          FIDELITY PENSION 
                                   MANAGEMENT                    245,180

CITIBANK                           FIDELITY PENSION 
                                   MANAGEMENT                    515,380

CHASE NOMINEES LTD.                FIDELITY PENSION 
                                   MANAGEMENT                  7,697,132

BANK OF NEW YORK LONDON            FIDELITY PENSION 
                                   MANAGEMENT                  1,733,340

NORTHERN TRUST                     FIDELITY PENSION 
                                   MANAGEMENT                  2,202,245

HSBC CLIENT HOLDINGS NOMINEE (UK)  FIDELITY PENSION 
LIMITED                            MANAGEMENT                    152,184

BANKERS TRUST                      FIDELITY INTERNATIONAL 
                                   LIMITED                       292,500

RBS TRUST BANK                     FIDELITY INTERNATIONAL           
                                   LIMITED                     3,500,820

CITIBANK                           FIDELITY INTERNATIONAL 
                                   LIMITED                       367,120

CHASE NOMINEES LTD                 FIDELITY INTERNATIONAL 
                                   LIMITED                    14,193,952

HSBC CLIENT HOLDINGS NOMINEE (UK)  FIDELITY INTERNATIONAL 
LIMITED                            LIMITED                    71,165,880

CHASE MANHATTAN BANK LONDON        FIDELITY INTERNATIONAL           
                                   LIMITED                     5,436,907

DEUTSCHE BANK                      FIDELITY INTERNATIONAL 
                                   LIMITED                     1,441,330

BANK OF NEW YORK LONDON            FIDELITY INTERNATIONAL 
                                   LIMITED                     8,805,086

NORTHERN TRUST                     FIDELITY INTERNATIONAL 
                                   LIMITED                     6,572,681

BANK OF NEW YORK BRUSSELS          FIDELITY INTERNATIONAL 
                                   LIMITED                     2,136,200

STATE STREET BANK & TRUST          FIDELITY INTERNATIONAL 
                                   LIMITED                     1,527,137

MELLON BANK                        FIDELITY INTERNATIONAL 
                                   LIMITED                     1,255,700

JP MORGAN                          FIDELITY INTERNATIONAL 
                                   LIMITED                       933,800


5) Number of shares/amount of stock acquired

5,531,917

6) Percentage of issued class

0.29%

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

NOT DISCLOSED

11) Date company informed

12 August 2004

12) Total holding following this notification

227,458,905 SHARES

13) Total percentage holding of issued class following this notification

12.001%

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: 13 August 2004


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