Cast
Ralph Richardson
Prof. Heatherville
Richard Attenborough
Jack Arnold
David Hutcheson
Squadron Leader Sowerby
O.B. Clarence
Old Retainer
Kenneth More
Bomb Aimer (uncredited)
Murray Matheson
Wing Cdr. Allen
Marjorie Rhodes
Mrs. Arnold
Arthur Mullard
(uncredited)
Peggy Evans
Daphne Adams
Hugh Pryse
Sir Nicholas Hathaway
Aubrey Mallalieu
1st Club Member
Raymond Huntley
Prof. Laxton-Jones
David Tomlinson
Mr. Watlington
Cyril Smith
Flight Sgt. Cox
Michael Hordern
Lt. Cmdr. Lowther
Joan Young
Mrs. McVitie
Bill Owen
Paratroop Sergeant (as Bill Rowbotham)
John Laurie
Dr. McVitie
Finlay Currie
Sir Duncan Wills
Pamela Matthews
Mrs. Watlington
Patrick Waddington
Group Capt. Aspinall
James Hayter
Warrant Officer
Robert Wyndham
Major
Robin Bailey
Wives' Escort Officer
Anthony Dawson
Flt. Lt. Norton
Vida Hope
WAAF Flight Sergeant
Desmond Roberts
2nd Club Member
Paul Carpenter
Flt. Lt. Argylle