Jack Hawkins

Supt Tom Halliday

John Stratton

Sergeant Ward

Dorothy Alison

Mary Halliday

Michael Brooke

Tony Halliday

Sam Kydd

Police Constable in Information Room

Glyn Houston

Detective Sergeant in 'Q' car

Richard Leech

Nightwatchman / Gilson

Newton Blick

Deputy Commander

Geoffrey Keen

Chief Superintendent Jim Malcolm