Sarah Miles ( Sarah Miles )

Lady Caroline Lamb

Jon Finch ( Jon Finch )

William Lamb

Richard Chamberlain ( Richard Chamberlain )

George Gordon, Lord Byron

John Mills ( John Mills )

Canning

Margaret Leighton ( Margaret Leighton )

Lady Melbourne

Pamela Brown ( Pamela Brown )

Lady Bessborough

Silvia Monti ( Silvia Monti )

Miss Milbanke

Ralph Richardson ( Ralph Richardson )

George IV

Laurence Olivier ( Laurence Olivier )

Duke of Wellington

Caterina Boratto ( Caterina Boratto )

Peter Bull ( Peter Bull )

Minister

Roy Stewart ( Roy Stewart )

Black Pug

Michael Wilding ( Michael Wilding )

Lord Holland

Charles Carson ( Charles Carson )

Potter

Sonia Dresdel ( Sonia Dresdel )

Lady Pont

Nicholas Field ( Nicholas Field )

St. John

Felicity Gibson ( Felicity Gibson )

Girl in Blue

Robert Harris ( Robert Harris )

Apothecary

Richard Hurndall ( Richard Hurndall )

Radical

Paddy Joyce ( Paddy Joyce )

Irish housekeeper

Bernard Kay ( Bernard Kay )

Benson

Janet Key ( Janet Key )

Miss Fairfax

Mario Maranzana ( Mario Maranzana )

Coachman

Robert Mill ( Robert Mill )

ADC to Wellington

Norman Mitchell ( Norman Mitchell )

Restaurant functionary

John Moffatt ( John Moffatt )

Murray

Trevor Peacock ( Trevor Peacock )

Agent

Maureen Pryor ( Maureen Pryor )

Mrs. Buller

Fanny Rowe ( Fanny Rowe )

Lady Holland

Stephen Sheppard ( Stephen Sheppard )

Buckham

Ralph Truman ( Ralph Truman )

Admiral

Jack Carter ( Jack Carter )

Guest (uncredited)