Robert Morley
Sir Wilfred
Anthony Dawson
Gerald Loddon
Robert Shaw
First Photographer
Olivia de Havilland
Lady Margaret Anne Loddon
Joyce Carey
Miss Sykes
Wilfrid Hyde-White
Hubert Foxley
Dirk Bogarde
Sir Mark Loddon / Frank Welney / Number Fifteen
Paul Massie
Jeffrey Buckenham
Kenneth Griffith
Fitch
Richard Wattis
The Judge
Sam Kydd
Newspaper Vendor (uncredited)
Vanda Hudson
Girl in Street
Martin Miller
Dr. Schrott
Sebastian Saville
Michael Loddon
Bill Shine
The Guide
Richard Pearson
The Butler
Geoffrey Bayldon
Second Photographer
Toke Townley
Associate
Millicent Martin
Maisie
Arthur Howard
Car Salesman
Ivan Samson
Admiral Loddon
Josephine Middleton
Mrs. Squire
Victor Harrington
Barrister (uncredited)
Richard Dimbleby
Himself