Clifton Webb
Lt. Cmdr. Ewen Montagu
Acting
Gloria Grahame
Lucy Sherwood
Acting
Robert Flemyng
Lt. George Acres
Acting
Josephine Griffin
Pam
Acting
Stephen Boyd
Patrick O'Reilly
Acting
Laurence Naismith
Adm. Cross
Acting
Geoffrey Keen
Gen. Nye
Acting
Moultrie Kelsall
The Father
Acting
Cyril Cusack
Taxi Driver
Acting
André Morell
Sir Bernard Spilsbury
Acting
Michael Hordern
Gen. Coburn
Acting
Allan Cuthbertson
Vice-Admiral
Acting
Joan Hickson
Landlady
Acting
Terence Longdon
Larry
Acting
Gibb McLaughlin
Porter
Acting
Miles Malleson
Scientist
Acting
William Russell
Joe
Acting
William Squire
Lt. Jewell
Acting
Richard Wattis
Shop Assistant
Acting
Ronald Adam
Adams
Acting
Robert Brown
French
Acting
Everley Gregg
Club Matron (uncredited)
Acting
Lloyd Lamble
Passport Officer (uncredited)
Acting
Brian Oulton
Wills Officer (uncredited)
Acting
John Welsh
Bank Manager
Acting
Peter Sellers
Winston Churchill (voice)
Acting