Michael Redgrave as Sir Arthur Benson-Gray

Tony Britton as Philip Selwood

Carl Möhner as Carl Romek

Niall MacGinnis as Neil Isherwood

Vanessa Redgrave as Pamela Benson-Gray

Ian Bannen as Alan Crabtree

Brenda Bruce as Elizabeth Fallon

Lionel Jeffries as Walter Froy

Miles Malleson as Sir Oswald Pettiford

John Welsh as Colonel Langley

Ann Firbank as Mrs. Judson

Jack Hedley as Dr. Galbraith

Hugh Miller as Examiner

Mary Skinner as Theatre Sister

Margaret Tyzack as Night Sister

William Roache as Young Doctor (uncredited)