Holding(s) in Company

Cookson Group PLC
11 January 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

BANK OF NEW YORK EUROPE LDN      FIDELITY INVESTMENTS INTERNATIONAL       6,037,698
JP MORGAN, BOURNEMOUTH           FIDELITY INVESTMENTS INTERNATIONAL       3,470,243
BROWN BROS HARRIMN LTD LUX       FIDELITY INTERNATIONAL LIMITED           88,627,829
JP MORGAN BOURNEMOUTH            FIDELITY INTERNATIONAL LIMITED           2,570,880
JP MORGAN, BOURNEMOUTH           FIDELITY INVESTMENT SERVICES LIMITED     89,845,214
JPMORGAN CHASE BANK              FMR CORP                                 30,000
BANK OF NEW YORK BRUSSELS        FIDELITY PENSION MANAGEMENT              1,956,355
BANK OF NEW YORK EUROPE LDN      FIDELITY PENSION MANAGEMENT              531,680
CITIBANK LONDON                  FIDELITY PENSION MANAGEMENT              882,500
JP MORGAN, BOURNEMOUTH           FIDELITY PENSION MANAGEMENT              6,295,047
NORTHERN TRUST LONDON            FIDELITY PENSION MANAGEMENT              6,732,635
STATE STR BK AND TR CO LNDN      FIDELITY PENSION MANAGEMENT              1,497,400

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

16,619,172

8) Percentage of issued class

0.88%

9) Class of security

ORDINARY SHARES OF 1 PENCE EACH

10) Date of transaction

NOT DISCLOSED

11) Date company informed

11 JANUARY 2005

12) Total holding following this notification

208,477,481 SHARES

13) Total percentage holding of issued class following this notification

10.99%

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: 11 JANUARY 2005


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