Guildhall Publishing Company Limited (The) | 26th January 1965 to 31st December 1978 |
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Panther Messengers Limited | 31st December 1978 to 25th September 1991 |
Securicor Management Services Limited | 25th September 1991 to 1st September 2010 |
G4S Management Services 127 (UK) Limited | 1st September 2010 to 18th February 2017 |