The Long Arm

Jack Hawkins

Supt Tom Halliday

John Stratton

Sergeant Ward

Dorothy Alison

Mary Halliday

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Michael Brooke

Tony Halliday

Sam Kydd

Police Constable in Information Room

Glyn Houston

Detective Sergeant in 'Q' car

Richard Leech

Nightwatchman / Gilson

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Newton Blick

Deputy Commander