Holding(s) in Company

RNS Number : 2709Q

Cookson Group PLC

07 April 2009

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:

STANDARD LIFE INVESTMENTS LTD

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

VIDACOS NOMINEES

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

3 APRIL 2009

6. Date on which issuer notified:

6 APRIL 2009

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

13%

8. Notified details:

A: Voting rights attached to shares

Class/type of shares if possible using the ISIN CODE	Situation previous to the Triggering transaction
	Number of shares		Number of voting Rights
GB00B07V4P80	367,922,399	367,922,399

Resulting situation after the triggering transaction

Class/type of shares if possible using the ISIN CODE	Number of shares	Number of voting rights		% of voting rights
		Direct	Indirect	Direct	Indirect
GB00B07V4P80	352,922,399	224,653,638	128,268,761	8.128	4.641

B: Financial Instruments

Resulting situation after the triggering transaction

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