.
TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which
voting rights are attached:
COOKSON GROUP PLC

2. Reason for the notification (please state Yes/No):

An acquisition or disposal of voting rights: ( Yes)

An acquisition or disposal of financial instruments which may result in the
acquisition of shares already issued to which voting rights are attached: (
)

An event changing the breakdown of voting rights: (    )

Other (please specify): (      )

3. Full name of person(s) subject to the notification obligation:
AEGON UK Group of Companies

4. Full name of shareholder(s) (if different from 3.):


5. Date of the transaction (and date on which the threshold is crossed or
reached if different):
2 March 2010

6. Date on which issuer notified:
3 March 2010

7. Threshold(s) that is/are crossed or reached:
4-3%

8. Notified details:
#####..

A: Voting rights attached to shares

Class/type of shares if possible        Situation previous to the
using the ISIN CODE                       Triggering transaction

                                    Number of shares Number of voting
                                                     Rights

GB00B3WK5475                            11,131,007        11,131,007


Resulting situation after the triggering transaction

Class/type of shares if possible      Number of   Number of voting    % of voting
using the ISIN CODE                   shares      rights              rights

                                      Direct      Direct     Indirect Direct Indirect

GB00B3WK5475                          10,008,154  10,008,154 151,451  3.63   0.05


B: Qualifying Financial Instruments
Resulting situation after the triggering transaction

Type of      Expiration Exercise/      Number of voting rights that may be   % of
financial    Date       Conversion     acquired if the instrument is         voting
instrument              Period/ Date   exercised/ converted.                 rights


                                      N/A


C: Financial Instruments with similar economic effect to Qualifying Financial
Instruments
Resulting situation after the triggering transaction

Type of      Exercise Expiration Exercise/    Number of voting     % of voting
financial    date     date       Conversion   rights instrument    rights
instrument                       period       refers to

                                                                   Nominal Delta

   Contract for      n/a   n/a       n/a             62,499         0.02    1.0
    difference


Total (A+B+C)
Number of voting       % of voting
rights                 rights

10,222,104             3.70


9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable:

AEGON UK Group of companies - parent undertaking of:
AEGON Asset Management UK plc
AEGON Investment Management UK ltd
AEGON ICVC

Proxy Voting:

10. Name of the proxy holder:

AEGON UK Group of companies

11. Number of voting rights proxy holder will cease to hold:

 908,903

12. Date on which proxy holder will cease to hold voting rights:
 2 March 2010

13. Additional information:

AEGON UK Group of companies - consists of:
AEGON Asset Management UK plc
AEGON Investment Management UK Ltd
AEGON ICVC


14. Contact name:
RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC

15. Contact telephone number:
+  44 (0) 20 7822 0000

END