Characters played by Laurence Payne
Norman Martell
Characters played by Patricia Dainton
Helen Martell
Characters played by Jane Griffiths
Peggy Hill
Characters played by Edward Underdown
Dr. Murdoch
Characters played by John Arnatt
Supt. Ross
Characters played by Humphrey Lestocq
Producer
Characters played by Lucy Griffiths
Miss Potter
Characters played by Olive Milbourne
Mrs. Booth
Characters played by Arthur Hewlett
Marshall
Characters played by Annette Kerr
Cinema cashier
Characters played by Cleo Laine
Singer
Characters played by Sylvia Davis
Cinema sales girl
Characters played by Max Faulkner
Det. Sgt. Fred Smith
Characters played by Garard Green
Patrol car policeman
Characters played by Arthur Howell
P.C. Williams
Characters played by Aileen Lewis
Sheila (Party Guest)
Characters played by Dudley Moore
Piano accompanist
Characters played by Pat Ryan
Detective Examining Tape-Recorder
Characters played by Stuart Saunders
Cinema manager
Characters played by Arthur Skinner
Det. Sgt. Carter