Dirk Bogarde

Dr. Henry Laidlaw Longman

Mary Ure

Oonagh Longman

John Clements

Major Hall

Wendy Craig

Annabella

Geoffrey Keen

Calder

Norman Bird

Aubrey

Michael Bryant

Dr. Danny Tate

Harold Goldblatt

Professor Sharpey

Edward Fox

Stewart (uncredited)

Terry Palmer

Norman

Roger Delgado

Dr. Jean Bonvoulois (uncredited)

Terence Alexander

Rowing Coach (uncredited)

Grace Arnold

Train Passenger (uncredited)

Ian Dewar

Crowd Ringleader (uncredited)

David Weston

Student at Party (uncredited)