Chief Superintendent Guy Mannion was a recurring character in The Bill from 1999 until 2001. He was played by Nick Miles.
Mannion originally appeared as the officer in charge of Sun Hill's neighbouring station and perennial rivals, Barton Street. A youthful graduate-entry high-flier, he was in many ways the antithesis of Sun Hill's commanding officer, Chief Superintendent Brownlow. Not surprisingly, Mannion and Brownlow became bitter rivals, especially when the new post of Borough Commander came up for grabs. Brownlow was not at all pleased when Mannion was selected for the role: even though they held the same rank, and Brownlow was much more experienced, Mannion was the one in charge.
Mannion played an instrumental part in the removal of Brownlow and CID Officers DI Deakin and DS Daly following the Don Beech scandal, and the appointment of Brownlow's replacement, Tom Chandler. Mannion himself was succeeded as Borough Commander by Jane Fitzwilliam: his fate was never explained on screen, though Tom Chandler said he was to be receiving his 'carriage clock' in Liquid City, which hints at retirement.