Holding(s) in Company

Keller Group plc ("the Company")                        

Keller Group plc was advised on 10 April 2006 that Columbia Wanger Asset
Management, L.P. holds an interest in 1,990,000 ordinary shares in the Company
representing 3.04% of the Company's issued share capital.

The registered holders of the shares are as follows:

Wanger International Small Cap Advisor - State Street Nominees      450,000    
Ltd                                                                          
                                                                             
Columbia Acorn International Fund - State Street Nominees Ltd     1,300,000  
                                                                             
RiverSource Partners International Aggressive Growth Fund - Bank     65,000     
of New York                                                                  
                                                                             
Wanger European Small Cap Fund - State Street Nominees Ltd          175,000