Mark Rylance

as Dr. David Kelly

Jonathan Cake

as Alastair Campbell

Emma Fielding

as Susan Watts

Daniel Ryan

as Andrew Gilligan

Geraldine Alexander

as Janice Kelly

Georgina Rylance

as Rachel Kelly

James Larkin

as Tony Blair

Julian Wadham

as Jonathan Powell

Pip Torrens

as John Scarlett

Barnaby Kay

as Tom Kelly

Jonathan Aris

as Bryan Wells

Michael Cochrane

as Sir Richard Dearlove

Ben Miles

as Kevin Marsh

Alex Reid

as Claire

Bill Stewart

as Barry Trent

Philip Bowen

as Sir Kevin Tebbit

Tom Beard

as Godric Smith

Darren Morfitt

as Daniel Pruce

Martin Maynard

as Paul Hammill

Geoffrey Freshwater

as Andrwe MacKinlay

Shaughan Seymour

as Richard Ottaway

James Aubrey

as David Chidgey

Jasper Jacob

as Greg Pope

Jay Villiers

as Geoff Hoon

Patrick Pearson

as Patrick Lamb

Richard Huw

as Richard Hatfield

Dominic Jephcott

as Martin Howard

Celia Robertson

as Kate Wilson

Peter Forbes

as Wing Commander John Clark

Richard Hope

as Richard Sambrook

Kate Miles

as Miranda Holt

David Prosho

as Steve Haws

Howard Ward

as Mark Ridsdale

Kayvan Novak

as Qasim Hamdani

Younes Megri

as General Amin

Nigel Hastings

as Nick Radford