Holding(s) in Company

Cookson Group PLC
14 July 2006

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1) Name of company

COOKSON GROUP PLC

2) Name of shareholder having a major interest

AVIVA PLC AND ITS SUBSIDIARIES

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 IN 2 ABOVE

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

Morley Fund Management Ltd:

BNY Norwich Union Nominees Limited        2,269,940*
Chase GA Group Nominees Limited           5,132,828*
Chase Nominees Limited                      205,468*
CUIM Nominee Limited                      2,024,741*



* denotes beneficial interest

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

5,405

8) Percentage of issued class

0.003%

9) Class of security

ORDINARY SHARES OF 10 PENCE EACH

10) Date of transaction

12 JULY 2006

11) Date company informed

14 JULY 2006

12) Total holding following this notification

9,632,977*

*  beneficial interest only

13) Total percentage holding of issued class following this notification

4.998%

14) Any additional information

N/A

15) Name of contact and telephone number for queries

RICHARD MALTHOUSE, COMPANY SECRETARY, COOKSON GROUP PLC - TEL: [phone]


16) Name and signature of authorised company official responsible for
making this notification

RICHARD MALTHOUSE, COMPANY SECRETARY, COOKSON GROUP PLC

Date of notification: 14 JULY 2006






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