Holding(s) in Company

Cookson Group PLC
16 March 2007



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:

LLOYDS TSB GROUP PLC



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):

N/A



6. Date on which issuer notified:

     16 MARCH 2007



7. Threshold(s) that is/are crossed or reached:

N/A



8. Notified details:

.................



A: Voting rights attached to shares


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


BO7V4P8                           N/A                                N/A




Resulting situation after the triggering transaction


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


BO7V4P8                      6,902,908                6,902,908    102,327              3.568       0.053



B: Financial Instruments

Resulting situation after the triggering transaction


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





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


7,005,235                      3.621



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








Proxy Voting:



10. Name of the proxy holder:





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





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





13. Additional information:



14. Contact name:

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC



15. Contact telephone number:

+  44 (0)20 7822 0000




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