Holding(s) in Company

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):

18 NOVEMBER 2011

6. Date on which issuer notified:

21 NOVEMBER 2011

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

11%

8. Notified details:

A: Voting rights attached to shares

Class/type of shares if    Situation previous to the Triggering transaction  
possible using the ISIN                                                      
CODE                                                                         
                                                                             
                         Number of shares          Number of voting Rights   
                                                                             
                                                                             
GB00B3WK5475                   30,476,618                 30,476,618         

Resulting situation after the triggering transaction

Class/type of      Number of shares Number of voting rights   % of voting      
shares if possible                                            rights           
using the ISIN                                                                 
CODE                                                                           
                                                                               
                                    Direct     Indirect       Direct   Indirect
                                                                               
                                                                               
GB00B3WK5475       29,865,694       16,299,756 13,565,938     5.896    4.907   

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

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

C: Financial Instruments with similar economic effect to Qualifying Financial
Instruments

Resulting situation after the triggering transaction

Type of    Exercise    Expiration  Exercise/      Number of       % of voting   
financial  price       date        Conversion     voting rights   rights        
instrument                         period         instrument                    
                                                  refers to                     
                                                                                
                                                                                
                                                                  Nominal Delta 
                                                                                
                                      N/A                                       

Total (A+B+C)

Number of voting       % of voting rights   
rights                                      
                                            
                                            
29,865,694             10.804%              

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