Tony Britton
— Simon Scott
Sylvia Syms
— Jean Scott
Jack Watling
— Bill Thompson
Walter Fitzgerald
— Sir John Dell
Geoffrey Keen
— Colonel Wilson
Howard Marion-Crawford
— George Bates
John Welsh
— Chief Customs Officer
Ian Bannen
— Junior Customs Officer
Lockwood West
— Mr. Barraclough
Harry Fowler
— Charlie
Frederick Piper
— Careers Officer
Cyril Luckham
— Magistrate
Thorley Walters
— Photographer
Ernest Clark
— Barrister
Fanny Rowe
— Secretary
Malcolm Keen
— Bristow
Arnold Bell
— Green (uncredited)
Victor Brooks
— 2nd Reception Officer (uncredited)
Laidman Browne
— Dawson (uncredited)
Jeremy Burnham
— Dudley (uncredited)
Gay Cameron
— Ruth (uncredited)
Glyn Houston
— Police Officer in Court (uncredited)
David Hutcheson
— Ex-R.A.F. Type (uncredited)
Barry Keegan
— Junior Reception Officer (uncredited)
Howard Lang
— Cellblock Officer (uncredited)
Richard Leech
— Hawkins (uncredited)
Michael Lewin
— Bit Part (uncredited)
Ralph Michael
— Crowther (uncredited)
James Raglan
— Prison Governor (uncredited)
Anthony Sagar
— 1st Reception Officer (uncredited)