Donald Pleasence
— Arthur Brownjohn / Sir Easonby 'E' Mellon
Shelley Winters
— Hester Green
Terry-Thomas
— Clennery Tubbs
Tammy Grimes
— Lady Joan Mellon
Judith Arthy
— Patricia Parker
Michael Bates
— Mr. Harrington
Peter Bayliss
— Dr. Hubbles
Joan Benham
— Mrs. Payne
Erik Chitty
— Uncle Ratty
Margaret Courtenay
— Clare Brownjohn
Mark Eden
— Jack Parker
Robin Ellis
— Ames
Raymond Huntley
— George Payne
Patsy Smart
— Miss Bonnamie
Oliver Tobias
— Peter 'Bobo' Jackson
Keith Marsh
— Lillywhite