Holding(s) in Company

Cookson Group PLC
06 April 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

CHASE NOMINEES LIMITED                  FIDELITY MANAGEMENT 
                                        & RESEARCH COMPANY          500,000

STATE STREET NOMINEES LTD.              FIDELITY MANAGEMENT 
                                        TRUST COMPANY               150,000                            

BROWN BROTHERS HARRIMAN                 FIDELITY MANAGEMENT 
                                        TRUST COMPANY               110,800

STATE STREET BANK & TRUST               FIDELITY MANAGEMENT 
                                        TRUST COMPANY                72,100

CHASE NOMINEES LTD.                     FIDELITY INVESTMENT 
                                        SERVICES LTD.            83,442,442

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

RBS TRUST BANK                          FIDELITY PENSION 
                                        MANAGEMENT                  754,695

NORTRUST NOMINEES LTD.                  FIDELITY PENSION 
                                        MANAGEMENT                1,250,460

BT GLOBENET NOMINEES LTD.               FIDELITY PENSION 
                                        MANAGEMENT                  245,180

CITIBANK                                FIDELITY PENSION 
                                        MANAGEMENT                  515,380

CHASE NOMINEES LTD.                     FIDELITY PENSION 
                                        MANAGEMENT                9,483,901

BANK OF NEW YORK LONDON                 FIDELITY PENSION 
                                        MANAGEMENT                1,846,140

NORTHERN TRUST                          FIDELITY PENSION 
                                        MANAGEMENT                2,202,245

HSBC CLIENT HOLDINGS NOMINEE (UK)       FIDELITY PENSION      
LIMITED                                 MANAGEMENT                  750,000

BANKERS TRUST                           FIDELITY INTERNATIONAL 
                                        LIMITED                     292,500

RBS TRUST BANK                          FIDELITY INTERNATIONAL 
                                        LIMITED                   7,225,440

CITIBANK                                FIDELITY INTERNATIONAL 
                                        LIMITED                     367,120

CHASE NOMINEES LTD                      FIDELITY INTERNATIONAL 
                                        LIMITED                  16,462,252

HSBC CLIENT HOLDINGS NOMINEE (UK)       FIDELITY INTERNATIONAL                                         
LIMITED                                 LIMITED                  81,953,280

CHASE MANHATTAN BANK LONDON             FIDELITY INTERNATIONAL 
                                        LIMITED                   6,814,905

DEUTSCHE BANK                           FIDELITY INTERNATIONAL 
                                        LIMITED                   3,689,330

BANK OF NEW YORK LONDON                 FIDELITY INTERNATIONAL 
                                        LIMITED                   9,552,286

NORTHERN TRUST                          FIDELITY INTERNATIONAL 
                                        LIMITED                   3,030,520

MELLON TRUST                            FIDELITY INTERNATIONAL 
                                        LIMITED                           0

BANK OF NEW YORK BRUSSELS               FIDELITY INTERNATIONAL 
                                        LIMITED                     995,200

STATE STREET BANK & TRUST               FIDELITY INTERNATIONAL 
                                        LIMITED                   4,257,763

JP MORGAN                               FIDELITY INTERNATIONAL 
                                        LIMITED                     347,700


5) Number of shares/amount of stock acquired

1,146,271


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

1 APRIL 2004

11) Date company informed

5 APRIL 2004

12) Total holding following this notification

247,069,641 SHARES

13) Total percentage holding of issued class following this notification

13.039%

14) Any additional information

FMR Corp. & Fidelity International Limited's holding briefly fell below 13% on
27 February 2004.  However, their total holding has now returned to 13.039% as
per the above announcement.


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: 6 APRIL 2004


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