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                                 45,777*
                                                                                        
                                                                                        
                                                                                        
                          BNY Norwich Union Nominees Limited        324,148*            
                                                                                        
                                                                                        
                                                                                        
                                                                                        
                          Chase (GA Group) Nominees Limited         2,016,612*          
4. Full name of                                                                         
shareholder(s)                                                                          
 (if different from 3.):                                                                
iv                        Chase Nominees Limited                                113,988*
                                                                                        
                                                                                        
                                                                                        
                          CUIM Nominee Limited                                   35,479*
                                                                                        
                                                                                        
                                                                                        
                          Vidacos Nominees Limited                               41,329*
                                                                                        
                                                                                        
                                                                                        
                          *denotes direct interest                                      
                                                                                        
                                                                                        
                                                                                        
5. Date of the                                                                          
transaction and date on                                                                 
which the threshold is    17 May 2011                                                   
crossed or                                                                              
reached: v                                                                              
                                                                                        
6. Date on which issuer   18 May 2011                                                   
notified:                                                                               
                                                                                        
7. Threshold(s) that is/                                                                
are crossed or            3% to 4% Change at Direct 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                                                                                   
                                                                                         
             2,337,236     2,337,236   2,577,333 2,577,333 Not         4.01%  Not        
                                                           Disclosable        Disclosable
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     Expiration Exercise/  Number of voting rights    % of voting  
financial     price        date xvii  Conversion instrument refers to       rights xix,  
instrument                            period                                xx           
                                      xviii                                              
                                                                                         
                                                                                         
                                                                            Nominal Delta     
                                                                                         
                                                                                         
                                                                                         

 

Total (A+B+C)                                                                           
                                                                                        
Number of voting rights                  Percentage of voting rights                    
                                                                                        
2,577,333                                4.01%                                          
                                                                                        

 

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