Deborah Kerr as Prudence Hardcastle

David Niven as Gerald Hardcastle

Robert Coote as Henry Hardcastle

Irina Demick as Elizabeth Brett

Joyce Redman as Grace Hardcastle

Judy Geeson as Geraldine Hardcastle

Keith Michell as Dr. Alan Huart

Edith Evans as Roberta Bates

David Dundas as Tony Bates

Vickery Turner as Rose

Hugh Armstrong as Ted

Peter Butterworth as Chemist

Moyra Fraser as Woman in Tea Shop

Annette Kerr as Gerald's Secretary

Harry Towb as Racetrack Official

Jonathan Lynn as Chemist's Assistant

Roy Beck as Hospital Visitor (uncredited)

Ivor Dean as City Banker in Taxi Cab (uncredited)

Arthur Hewlett as Mr. Ferguson (uncredited)

Michael Hordern as Dr. Morley (uncredited)

John Tatham as Man Sitting in Grandstand at the Races (uncredited)

Joseph Tregonino as Waiter (uncredited)