- Author:
- Ian Hay
- Producer:
- Kenneth M. Buckley
- Abel Mainwaring, M.P.:
- Ian Fleming
- Sylvia, his daughter:
- Joan Benham
- Milroy, the butler:
- Alan Aldridge
- Lady Marian Mainwaring:
- Mary Glynne
- Rev. Adrian Rylands:
- Charles Carter
- Constance Damer:
- Joan Matheson
- Richard Mainwaring:
- Frederick Bradshaw
- Tilly Welwyn:
- Ursula Howells
- Percy Welwyn:
- Desmond Walter-Ellis
- Grandma Banks, Mrs. Welwyn's mother:
- Nellie Bowman
- Amelia Welwyn:
- Dorothy Gordon
- Mehta Ram:
- Abraham Sofaer
- Mrs. Welwyn:
- Kathleen Boutall
- Lucius Welwyn:
- Julian D'Albie
- Mr. Stillbottle:
- Cameron Hall
- Mr. Pumpherston:
- Alan Aldridge
