TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi                                                    
                                                                                                       
    1. Identity of the issuer or the underlying issuer                                 Keller Group Plc
    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                                                  Yes   
                                                                                                       
    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               Standard Life Investments (Holdings) Limited
    notification obligation: iii                                                       (Parent Company)
                                                                                                       
                                                                                                       
    4. Full name of shareholder(s)                                                                     
     (if different from 3.):iv                                                                         
                                                                                                       
    5. Date of the transaction and date on                                                   06/01/2017
    which the threshold is crossed or                                                                  
    reached: v                                                                                         
                                                                                                       
    6. Date on which issuer notified:                                                        09/01/2017
                                                                                                       
    7. Threshold(s) that is/are crossed or                                                             
    reached: vi, vii                                            Standard Life Investments Limited - 12%
                                                                                                       

       

    8. Notified details:                                                                                    
                                                                                                            
    A: Voting rights attached to shares viii, ix                                                            
                                                                                                            
    Class/type of   Situation previous            Resulting situation after the triggering transaction      
    shares          to the triggering                                                                       
                    transaction                                                                             
    if possible                                                                                             
    using           Number           Number       Number       Number of voting      % of  voting rights x  
    the ISIN CODE   of               of           of shares    rights                                       
                    Shares           Voting                                                                 
                                     Rights       Direct       Direct xi Indirect    Direct     Indirect    
                                                                         xii                                
                                                                                                            
    GB0004866223    9,587,567        9,587,567    9,566,407              9,566,407              13.294%     
                                                                                                            
    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 xiv   rights that may be      rights             
                                                                 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 financial  Exercise    Expiration   Exercise/     Number of voting rights  % of voting rights   
    instrument         price       date xvii    Conversion    instrument refers to     xix, xx              
                                                period xviii                                                
                                                                                                            
                                                                                       Nominal     Delta    
                                                                                                            
    Total (A+B+C)                                                                                           
                                                                                                            
    Number of voting rights                             Percentage of voting rights                         
                                                                                                            
    9,566,407                                           13.294%                                             
                                                                                                            

       

    9. Chain of controlled undertakings through which the voting rights and/or the              
    financial instruments are effectively held, if applicable: xxi                              
                                                                                                
                                                                                                
    Standard Life Investments (Holdings) Limited - 13.294%                                      
    Standard Life Investments Limited - 11.951%                                                 
    Ignis Investment Services Limited - below 5%                                                
                                                                                                
    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:                       Total Voting rights of 71,962,017 based on
                                                           company announcement as at 03/01/2017
                                                                                                
    14. Contact name:                                                              Kerry Porritt
                                                                                                
    15. Contact telephone number:                                                  0207 616 7575