Vesuvius Regulatory News (VSVS)

6 Mar 2009 17:23

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): ( Yes, increase in total voting rights issued by the Company )

3. Full name of person(s) subject to the notification obligation:

FIL Limited (FIL)

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

See section 9

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

4 March 2009

6. Date on which issuer notified:

6 March 2009

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

5% 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 ISIN GB00B07V4P80 24,048,837 24,048,837

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 ISIN GB00B07V4P80 115,960,563 115,960,563 4.19 B: 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 Total (A+B)Number of voting % of voting rights rights 115,960,563 4.19

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

FIL Issue name: Cookson Group plc Current ownership percentage: 4.19% Total shares held: 115,960,563 Issued share capital: 2,763,900,906

FIL Limited (FIL) is the parent holding company for SHARES HELD NOMINEE MANAGEMENT various direct and indirect subsidiaries, including

COMPANY FIL Fund Management Limited (FFML), FIL Investment

Services Ltd (FISL), FIL Gestion (FIGEST), FIL Asset 15,062,445 BNP PARIBAS, FIGEST Management (Korea) Limited (FIAKL), FIL Investments

PARIS Management (Hong Kong) Limited (FIMHK), FIL Pension

Management (FPM), Fidelity Investments Japan (FIJ) 10,654,900 BROWN BROS FIL and FIL Investments International (FII), investment

HARRIMN LTD managers for various non-US investment companies and LUX institutional clients. 4,602,464 JP MORGAN, FII BOURNEMOUTH 31,720 JP MORGAN, FIL BOURNEMOUTH 79,167,334 JP MORGAN, FISL BOURNEMOUTH 6,441,700 JP MORGAN, FIL BOURNEMOUTH (C) Proxy Voting: 10. Name of the proxy holder:FIL Limited (FIL)

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

91,911,726

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

4 March 2009 13. Additional information:

Threshold breach due to an increase in the total voting rights issued by the Company.

14. Contact name:

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC

15. Contact telephone number:

+ 44 (0) 20 7822 0000