Sarah Miles
— Lady Caroline Lamb
Jon Finch
— William Lamb
Richard Chamberlain
— George Gordon, Lord Byron
John Mills
— Canning
Margaret Leighton
— Lady Melbourne
Pamela Brown
— Lady Bessborough
Silvia Monti
— Miss Milbanke
Ralph Richardson
— George IV
Laurence Olivier
— Duke of Wellington
Caterina Boratto
Peter Bull
— Minister
Roy Stewart
— Black Pug
Michael Wilding
— Lord Holland
Charles Carson
— Potter
Sonia Dresdel
— Lady Pont
Nicholas Field
— St. John
Felicity Gibson
— Girl in Blue
Robert Harris
— Apothecary
Richard Hurndall
— Radical
Paddy Joyce
— Irish housekeeper
Bernard Kay
— Benson
Janet Key
— Miss Fairfax
Mario Maranzana
— Coachman
Robert Mill
— ADC to Wellington
Norman Mitchell
— Restaurant functionary
John Moffatt
— Murray
Trevor Peacock
— Agent
Maureen Pryor
— Mrs. Buller
Fanny Rowe
— Lady Holland
Stephen Sheppard
— Buckham