Colonall Limited | 19th March 1996 to 17th April 1996 |
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Group 4 Utility Services Limited | 17th April 1996 to 22nd December 2000 |
Group 4 Falck Utility Services Limited | 22nd December 2000 to 22nd September 2003 |
GSL Utility Services Limited | 22nd September 2003 to 23rd March 2009 |
G4S Managed Services (UK) Limited | 23rd March 2009 to 24th October 2011 |
G4S Government And Outsourcing Services (UK) Limited | 24th October 2011 to current |