Keira Knightley as Katharine Gun

Matt Smith as Martin Bright

Ralph Fiennes as Ben Emmerson

Adam Bakri as Yasar Gun

Matthew Goode as Peter Beaumont

Rhys Ifans as Ed Vulliamy

Indira Varma as Shami Chakrabarti

John Heffernan as James Welch

Conleth Hill as Roger Alton

Jack Farthing as Andy Dumfries

MyAnna Buring as Jasmine

Peter Guinness as TinTin

Chris Reilly as Jerry

Shaun Dooley as John

Ray Panthaki as Kamal Ahmed

Chris Larkin as Nigel Jones

Monica Dolan as Fiona Bygate

Clive Francis as Rear Admiral Nick Wilkinson

Tamsin Greig as Elizabeth Wilmshurst

Hattie Morahan as Yvonne Ridley

Kenneth Cranham as Judge Hyam

Jeremy Northam as Ken MacDonald

Hanako Footman as Nicole Mowbray

Angus Wright as Mark Ellison

Katherine Kelly as Jacqueline Jones, MI6 Agent

Raad Rawi as Mel

Fiona Skinner as Policewoman

Niccy Lin as Mi-Yung

Lindy Whiteford as Edie Rielly

Janie Dee as Jan Clements

Will Barton as Paul Beaver

Martin Bright as Male Journalist

Vanessa Thorpe as Female Journalist

Sophie Duval as Female Custody Sergeant

Stuart Ramsay as Police Officer

Jodie McNee as Duty Solicitor

David Maybrick as Officer Pitt

Simon Rogers as Officer Knowles

Raquel Cassidy as Anne Emmerson

Corinna Wilson as Young Romanian Girl

Brett Allen as Duty Officer

Patrick Moy as Driver

Vinta Morgan as BBC Reporter

Jessica Fostekew as Courtroom Guard

Michael James as Clerk of the Court

Gabrielle Downey as Mrs. Archer

Tony Blair as Self (archive footage) (uncredited)

George W. Bush as Self (archive footage) (uncredited)

Katharine Gun as Self (archive footage) (uncredited)

Colin Powell as Self (archive footage) (uncredited)

Grant Crookes as GCHQ Security

Rene Costa as Iraqi Protestor (uncredited)

Neilesh Ambu as GCHQ Colleague (uncredited)

Joanne James as Home Office Official Doncaster Airport (uncredited)