Holding(s) in Company

Cookson Group PLC
09 August 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        2,270,800*
Chase GA Group Nominees Limited           4,896,326*
Chase Nominees Limited                      202,092*
CUIM Nominee Limited                      1,992,578*

* 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

313,364

8) Percentage of issued class

0.16%

9) Class of security

ORDINARY SHARES OF 10 PENCE EACH

10) Date of transaction

8 August 2006

11) Date company informed

9 August 2006

12) Total holding following this notification

9,361,796*

*  beneficial interest only

13) Total percentage holding of issued class following this notification

4.86%

14) Any additional information

N/A

15) Name of contact and telephone number for queries

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC - TEL: [phone]

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

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC

Date of notification: 9 AUGUST 2006






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