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:

01 January 2009

To:

14 May 2009

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

CGESOS - 1,387,711 ordinary 10p shares

CGESSS - 510,606 ordinary 10p 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):

Nil

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

CGESOS - 1,387,711 ordinary 10p shares

CGESSS - 510,606 ordinary 10p shares

Name of contact:

Rachel Fell

Telephone number of contact:

020 7822 0000