Holding(s) in Company

Cookson Group PLC
30 June 2004

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1) Name of company

COOKSON GROUP PLC


2) Name of shareholder having a major interest

BARCLAYS PLC


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

AS ABOVE


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

BARCLAYS CAPITAL SECURITIES LIMITED (610,000 SHARES)
BARCLAYS GLOBAL INVESTORS LIMITED (60,098,035 SHARES)
BARCLAYS GLOBAL INVESTORS JAPAN LIMITED (411,118 SHARES)
BARCLAYS GLOBAL INVESTORS JAPAN TRUST & BANKING (1,802,288 SHARES)
BARCLAYS GLOBAL INVESTORS, N.A. (27,563,381 SHARES)
BARCLAYS GLOBAL FUND ADVISORS (699,300 SHARES)
BARCLAYS GLOBAL INVESTORS AUSTRALIA LIMITED (1,013,865 SHARES)
BARCLAYS LIFE ASSURANCE CO LIMITED (2,639,740 SHARES)
BARCLAYS PRIVATE BANK AND TRUST LIMITED (15,600 SHARES)
GERRARD LIMITED (336,307 SHARES)


5) Number of shares/amount of stock acquired

NOT DISCLOSED


6) Percentage of issued class

NOT DISCLOSED


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

24 JUNE 2004


11) Date company informed

30 JUNE 2004


12) Total holding following this notification

95,189,634 SHARES


13) Total percentage holding of issued class following this notification

5.02%


14) Any additional information



15) Name of contact and telephone number for queries

RACHEL BENJAMIN, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC - 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: 30 JUNE 2004


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