TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi                                

1. Identity of the issuer or the underlying           Interserve Plc           
issuer of existing shares to which voting                                      
rights are attached: ii                                                        

2. Reason for the notification (please tick the appropriate box or boxes):      

An acquisition or disposal of voting rights                               X    
                                                                               
An acquisition or disposal of qualifying financial instruments which           
may result in the acquisition of shares already issued to which voting         
rights are attached                                                            
                                                                               
An acquisition or disposal of instruments with similar economic effect         
to qualifying financial instruments                                            
                                                                               
An event changing the breakdown of voting rights                               
                                                                               
Other (please specify):                                                                      

3. Full name of person(s) subject to   JPMorgan Asset Management Holdings Inc. 
the notification obligation: iii                                               
                                                                               
4. Full name of shareholder(s) (if     JPMorgan Asset Management (UK) Limited  
different from 3.):iv                                                          
                                                                               
5. Date of the transaction and date                09 January 2013             
on which the threshold is crossed or                                           
reached: v                                                                     
                                                                               
6. Date on which issuer notified:                  10 January 2013             
                                                                               
7. Threshold(s) that is/are crossed    5% upwards - Voting rights attached to  
or reached: vi, vii                                    shares                  

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type of Situation previous            Resulting situation after           
shares         to the triggering                  the triggering                
                  transaction                      transaction                  
                                                                                
if possible    Number    Number    Number       Number of         % of voting   
using            of        of        of          voting            rights x     
the ISIN CODE  Shares    Voting    shares        rights                         
                         Rights                                                 
                                                                                
                                   Direct  Direct xi Indirect   Direct  Indirect
                                                        xii                     
                                                                                
GB0001528156  6,222,002 6,222,002                    6,367,639            5.02  
                                                                                
B: Qualifying Financial Instruments                                             
                                                                                
Resulting situation after the triggering transaction                            
                                                                                
Type of financial Expiration     Exercise/      Number of voting    % of voting 
   instrument     date xiii  Conversion Period rights that may be     rights    
                                    xiv          acquired if the                
                                                  instrument is                 
                                                   exercised/                   
                                                   converted.                   
                                                                                

C: Financial Instruments with similar economic effect to Qualifying Financial   
Instruments xv, xvi                                                             
                                                                                
Resulting situation after the triggering transaction                            
                                                                                
Type of financ Exercise Expiration Exercise/  Number of voting    % of voting   
     ial        price   date xvii  Conversion rights instrument  rights xix, xx 
  instrument                         period       refers to                     
                                     xviii                                      
                                                                                
                                                                Nominal   Delta 
                                                                                
 Contract for                                      124,555                0.10% 
  Difference                                                                    

Total (A+B+C)                                                                  
                                                                               
        Number of voting rights               Percentage of voting rights      
                                                                               
               6,492,194                                 5.12%                 

9. Chain of controlled undertakings through which the voting rights and/or the 
financial instruments are effectively held, if applicable: xxi                 
                                                                               
Total disclosable holding for JPMorgan Asset Management Holdings Inc: 6,492,194
(5.12%)                                                                        
                                                                               
JP Morgan Asset Management (UK) Limited 6,492,194 (5.12%)                      

Proxy Voting:                                                                  
                                                                               
10. Name of the proxy holder:                             N/A                  
                                                                               
11. Number of voting rights proxy                         N/A                  
holder will cease to hold:                                                     
                                                                               
12. Date on which proxy holder will                       N/A                  
cease to hold voting rights:                                                   

13. Additional information:                               N/A                  
                                                                               
14. Contact name:                                 Mr Trevor Bradbury           
                                                                               
15. Contact telephone number:                        0118 932 0123