Rory Kinnear
— Lord Lucan
Catherine McCormack
— Lady Veronica Lucan
Christopher Eccleston
— John Aspinall
Alistair Petrie
— Jimmy Goldsmith
Michael Gambon
— John Burke
Leanne Best
— Sandra Rivett
Paul Freeman
— John Pearson
Jane Lapotaire
— Susan Maxwell-Scott
Rufus Wright
— Younger John Burke
Rupert Evans
— Dominick Elwes
Gemma Jones
— Dowager Countess
Andrew Woodall
— Bill Shand-Kydd
Miles Richardson
— Coles
Julian Firth
— Eastham
Tim Bentinck
— Ludovic Kennedy
Michael Müller
— Dr. Flood