Tom Hughes
Joe Lambe (6 eps)
Jonathan Aris
Alan Montag (6 eps)
Victoria Hamilton
Sarah Montag (6 eps)
Shaun Dooley
DC Jim Fenchurch (6 eps)
Brian Cox
Daddy (6 eps)
Paul Ritter
Bobby Waterhouse (6 eps)
Chloe Pirrie
Wendy Straw (6 eps)
Zana Marjanović
Yulia (6 eps)
Judy Parfitt
Hester Waterhouse (5 eps)
Yevgeni Sitokhin
Odin (5 eps)
Marcel Iureș
Arkady (4 eps)
Velibor Topic
KGB Hood (2 eps)
Gemma Chan
Chen Mei (2 eps)
Rachael Stirling
Kate Wilkinson (2 eps)
Tim Bentinck
Home Secretary (2 eps)
Chris Cowlin
Member of Special Branch (uncredited) (2 eps)
Jay Simpson
Colin Blakefield (2 eps)
Bartley Burke
Ivan (2 eps)
Scott Handy
David Hexton (1 eps)
Gabrielle Scharnitzky
Kitty (1 eps)
Nick Holder
Comic (1 eps)
James Northcote
Waiter (1 eps)
Andy Sanderson
Police marksman (1 eps)
Yana Yanezic
Katia (1 eps)
Hugh O'Brien
Gentleman (uncredited) (1 eps)
Steven Mackintosh
Tom Mallory (1 eps)
Emma Fielding
Valerie Parkwood (1 eps)
Georgina Rich
Alice (1 eps)
Jon Glover
Public Information Film Narrator (1 eps)
Riky Ash
Vasily (1 eps)
Carly Bramwell
Prostitute (1 eps)
Richard Buck
Plain Clothes Police Officer (uncredited) (1 eps)
Anton Lesser
C (1 eps)
Todd Boyce
Hank Chambers (1 eps)
Adam James
George (1 eps)
Yuri Klimov
Kasimir (1 eps)
Alistair Petrie
Andrew (1 eps)
Jessica Boyde
Celine (1 eps)
Enzo Squillino Jr.
Hotel Proprietor (1 eps)
Goran Navojec
Bogdan Rodchenko (1 eps)
Andrew Bicknell
Martin (1 eps)
Craig Conway
Philip Denmoor (1 eps)
David Verrey
Edgar (1 eps)
Victoria Alcock
Bath House Lady (1 eps)
Laurence Kinlan
IRA Man (1 eps)
Joe Egan
The Big Fella (1 eps)
Stefan Boehm
MI5 Clerk (1 eps)
Richard McCabe
Prime Minister (1 eps)
Liz Sutherland
Chinese Restaurant Owner (1 eps)
Julia Krynke
Embassy Woman (1 eps)
Laurentiu Possa
Hood (1 eps)
Hermione Gulliford
Secretary to the Home Secretary (1 eps)
Doreene Blackstock
Nurse (1 eps)
Ian Hanmore
Dennis Lamb (1 eps)
Paul Kennington
Russian Spy (1 eps)