Holding(s) in Company

For filings with the FSA include the annex                                              
                                                                                        
For filings with issuer exclude the annex                                               
                                                                                        
                                                                                        
                                                                                        
TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi                                         
                                                                                        
                                                                                        
                                                                                        
1. Identity of the issuer or the underlying issuer                                      
of existing shares to which voting rights are                   Keller Group plc        
attached:ii                                                                             
                                                                                        
2. Reason for the notification (please tick the appropriate box or boxes):              
                                                                                        
An acquisition or disposal of voting rights                                            √
                                                                                        
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 the            Aviva plc & its subsidiaries                                  
notification obligation:                                                                
iii                                                                                     
                                                                                        
                          Registered Holder:                                            
                                                                                        
                                                                                        
                                                                                        
                          BNY (Nominees) Limited                                 53,684*
                                                                                        
                                                                                        
                                                                                        
                          BNY Norwich Union Nominees Limited        373,966*            
                                                                                        
                                                                                        
                                                                                        
                                                                                        
                          Chase (GA Group) Nominees Limited         2,269,229*          
                                                                                        
                                                                                        
                                                                                        
                          Chase Nominees Limited                                130,695*
                                                                                        
                                                                                        
                                                                                        
4. Full name of           CUIM Nominee Limited                                   43,361*
shareholder(s)                                                                          
 (if different from 3.):                                                                
iv                                                                                      
                          Vidacos Nominees Limited                               48,905*
                                                                                        
                                                                                        
                                                                                        
                          *denotes direct interest                                      
                                                                                        
                                                                                        
                                                                                        
                          BNP Paribas - London                                          
                          125,300                                                       
                                                                                        
                                                                                        
                                                                                        
                          Chase Nominees Limited                                        
                                                       55,122                           
                                                                                        
                                                                                        
                                                                                        
                          Vidacos Nominees Limited                             396,774  
                                                                                        
                                                                                        
                                                                                        
5. Date of the                                                                          
transaction and date on                                                                 
which the threshold is    24 May 2011                                                   
crossed or                                                                              
reached: v                                                                              
                                                                                        
6. Date on which issuer   25 May 2011                                                   
notified:                                                                               
                                                                                        
7. Threshold(s) that is/                                                                
are crossed or            <5% to 5% Change at Combined Interest Level                   
reached: vi, vii                                                                        
                                                                                        

 

8. Notified details:                                                                    
                                                                                        
A: Voting rights attached to shares viii, ix                                            
                                                                                        
Class/type   Situation previous          Resulting situation after the triggering       
of           to the triggering           transaction                                    
shares       transaction                                                                
                                                                                        
             Number          Number      Number    Number of voting    % of  voting     
if possible  of              of          of shares rights              rights x         
using        Shares          Voting                                                     
the ISIN                     Rights      Direct    Direct xi  Indirect Direct Indirect  
CODE                                                          xii                       
                                                                                        
Ordinary                                                                                
Shares                                                                                  
                                                                                        
             2,577,333       2,577,333   3,497,036 2,919,840  577,196  4.54%  0.90%     
                                                                                        
GB0004866223                                                                            
                                                                                        
                                                                                        
                                                                                        
                                                                                        
                                                                                        
B: Qualifying Financial Instruments                                                     
                                                                                        
Resulting situation after the triggering transaction                                    
                                                                                        
Type of        Expiration     Exercise/              Number of voting      % of voting  
financial      date xiii      Conversion Period xiv  rights that may be    rights       
instrument                                           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       Exercise price Expiration Exercise/  Number of voting       % of voting   
financial                    date xvii  Conversion rights instrument      rights xix, xx
instrument                              period     refers to                            
                                        xviii                                           
                                                                                        
                                                                                        
                                                                          Nominal Delta    
                                                                                        
                                                                                        
                                                                                        

 

Total (A+B+C)                                                                           
                                                                                        
Number of voting rights                  Percentage of voting rights                    
                                                                                        
3,497,036                                5.44%                                          
                                                                                        

 

9. Chain of controlled undertakings through which the voting rights and/or the          
financial instruments are effectively held, if applicable: xxi                          
                                                                                        
The voting rights are managed and controlled by Aviva Investors Global Services         
Limited, with the following chain of controlled undertakings:-                          
                                                                                        
                                                                                        
                                                                                        
Aviva Investors Global Services Limited:                                                
                                                                                        
Aviva plc (Parent Company)                                                              
                                                                                        
Aviva Group Holdings Limited (wholly owned subsidiary of Aviva plc)                     
                                                                                        
Aviva Investors Holdings Limited (wholly owned subsidiary of Aviva Group                
Holdings Limited)                                                                       
                                                                                        
Aviva Investors Global Services Limited (wholly owned subsidiary of Aviva               
Investors Holdings Limited)                                                             
                                                                                        
                                                                                        
                                                                                        
                                                                                        
                                                                                        
                                                                                        
                                                                                        
Proxy Voting:                                                                           
                                                                                        
10. Name of the proxy holder:                       See Section 4                       
                                                                                        
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:   Figures are based on a total number of voting rights of   
                               64,310,708, as per the Company's Total Voting Rights     
                              Announcement of 1 October 2010.                           
                                                                                        
                                                                                        
                                                                                        
14. Contact name:                  Neil Whittaker, Aviva plc                            
                                                                                        
15. Contact telephone number:      01603 684420