John Hurt

as Chris Mullin

Martin Shaw

as Ian McBride

Roger Allam

as Charles Tremayne

John Kavanagh

as Z

Robert Lang

as Detective Superintendant Ibison

Patrick Malahide

as Mike Mansfield

Bob Peck

as Chief Supt. Tom Meffen

Donal McCann

as N

Leslie Phillips

as Lord Chief Justice Lane

Terence Rigby

as Det. Supt. George Reade

David Ryall

as Dr. Frank Skuse

John Woodvine

as Tom Clarke

David Bamber

as David Mellor MP, Home Office

Ciarán Hinds

as Richard McIlkenny

Brid Brennan

as Sister of IRA man

John Lynch

as IRA man in cottage

Heather Chasen

as The Right Honourable Margaret Thatcher

Tony Doyle

as Richard Ferguson QC

James Berwick

as Joe Cahill

Brendan Cauldwell

as Callaghan

Julian Glover

as Igor Judge QC

Peter Gowen

as Eamon O'Connor

Ian McElhinney

as Sinn Fein leader

Gerard McSorley

as Paddy Mcllkenny

Sean McGinley

as A

Niall O'Brien

as Walker

Struan Rodger

as Ex-IRA man

Niall Tóibín

as Paddy Joe Hill

Donald Pickering

as Douglas Hurd, Foreign Secretary

Andy Bradford

David Howey

as Bob Clay MP

Diane Fletcher

as Gareth Peirce