Full Credits
25 members

Bernard Lee
Henry Houghton

William Sylvester
Gordon Lonsdale

Margaret Tyzack
Elizabeth Gee

David Kossoff
Peter Kroger

Nancy Nevinson
Helen Kroger

Thorley Walters
Cmdr. Winters
Gillian Lewis
Marjorie Shaw
Newton Blick
P.O. Meadows

Philip Latham
Captain Ray

Cyril Chamberlain
Anderson
Justine Lord
Christina

Patrick Barr
Captain Warner

Derek Francis
Chief Supt. Croft

Hector Ross
Supt. Woods

Paul Eddington
Johnnie (uncredited)

Richard Marner
Colonel Monat (uncredited)

Geoffrey Palmer
Police Officer (uncredited)

Bryan Pringle
Surveillance Man (uncredited)
Andre Mikhelson
Russian Embassy Official (uncredited)

Garry Marsh
First Member at Lords (uncredited)

Basil Dignam
Second Member at Lords (uncredited)

Brian Nissen
Portland Official (uncredited)
Edwin Apps
Blake (uncredited)

Fred Griffiths
News Vendor (uncredited)
Anita West
Tilly (uncredited)
13 members
Robert Tronson
Director
Derek Cracknell
Assistant Director
Peter Barnes
Writer
Frank Launder
Writer
Leslie Gilliat
Producer
Paul Sheridan
Casting
Arthur Lavis
Director of Photography
Jack Lowin
Camera Operator
Norman G. Arnold
Art Direction
Ernest Gasser
Makeup Artist
Daphne Vollmer
Hairdresser
Thelma Connell
Editor
Cecil Mason
Sound Recordist