Cast
Nicholas Parsons
Police Constable Bates
Peter Welch
CID Man (uncredited)
Joss Ambler
Cashier at Shipping Office
Roy Purcell
Sam Kydd
Police Constable in Information Room
Fred Davis
Barry Keegan
Detective Constable in Hospital Ward
Harold Goodwin
Official at Somerset House
Sydney Tafler
Stone
Arthur Rigby
Detective Inspector at Chester
Frederick Treves
Detective tailing Creasey (uncredited)
Jack McNaughton
Jameson Clark
Detective Superintendent Ogilvie
William Mervyn
Manager of Festival Hall
Stratford Johns
Constable (uncredited)
David Lodge
Detective at Car Lot (uncredited)
Guy Standeven
Detective (uncredited)
Fred Griffiths
John Stratton
Sergeant Ward
Richard Leech
Nightwatchman / Gilson
Geoffrey Keen
Chief Superintendent Jim Malcolm
Alec McCowen
House Surgeon
John Welsh
House Agent at Shepperton
George Rose
Slob
Maureen Delaney
Mrs. Stevens, the daily help
Vincent Ball
P.C. at Hospital (uncredited)
Pat Ryan
Meadows White
Jack Hawkins
Supt Tom Halliday
Glyn Houston
Detective Sergeant in 'Q' car
Ralph Truman
Colonel Blenkinsop
John Paul
Peter Burton
Creasey
Harry Locke
Secondhand Dealer
David Davies
Welsh Police Constable
George Holdcroft
Robert Moor
Maureen Davis
The Young Workman's Wife - Mrs. James
Meredith Edwards
Mr. Thomas
Martin Wyldeck
Officer in Criminal Records Department (uncredited)
Dorothy Alison
Mary Halliday
Ian Bannen
The Young Workman - Stanley James
Richard Davies
Detective (uncredited)
Frazer Hines
Urchin (uncredited)