Blocklisting Interim Review

Name of applicant:

Cookson Group plc

Name of scheme:

Cookson Group Executive Share Option Schemes (CGESOS)

Cookson Group Employee Share Savings Scheme (CGESSS)

Period of return:

From:

1 January 2010

To:

30 June 2010

Balance of unallotted securities under scheme(s) from previous return:

CGESOS - 136,930 ordinary £1 shares

CGESSS - 51,060 ordinary £1 shares

Plus:  The amount by which the block scheme(s) has been increased since the date of the last return (if any increase has been applied for):

Nil

Less:  Number of securities issued/allotted under scheme(s) during period (see LR3.5.7G):

CGESOS - 18,836 ordinary £1 shares

CGESSS - 20,142 ordinary £1 shares

Equals:  Balance under scheme(s) not yet issued/allotted at end of period:

CGESOS - 118,094 ordinary £1 shares

CGESSS - 30,918 ordinary £1 shares

Name of contact:

Rachel Fell

Telephone number of contact:

020 7822 0000