- Ross Kemp
- Â SSgt. Henry 'Henno' Garvie / ... 21 episodes, 2002-2006
- Miles Anderson
- Â Col. Aidan Dempsey / ... 16 episodes, 2002-2006
- Christopher Fox
- Â Cpl. Louis Hoffman / ... 14 episodes, 2002-2006
- Danny Sapani
- Â Cpl. Ricky Mann 13 episodes, 2002-2005
- Tony Curran
- Â Cpl. Sgt. Pete Twamley / ... 12 episodes, 2002-2003
- Jamie Draven
- Â Cpl. Jamie Dow 12 episodes, 2002-2003
- Alex Reid
- Â Capt. Caroline Walshe 11 episodes, 2002-2003
- Elliot Cowan
- Â Cpl. Jem Poynton 8 episodes, 2002-2003
- Jamie Bamber
- Â Lt. Dotsy Doheny 8 episodes, 2002-2003
- Heather Peace
- Â Becca Gallagher 8 episodes, 2005-2006
- Louis Decosta Johnson
- Â Dave Woolston 8 episodes, 2005-2006
- Derek Horne
- Â Sean Smith 8 episodes, 2003-2006
- Jackie Morrison
- Â Laura Twamley / ... 8 episodes, 2002-2003
- Lucy Akhurst
- Â Pru Banks 7 episodes, 2002-2003
- Sendhil Ramamurthy
- Â Cpl. Alex Leonard 6 episodes, 2002
- Sam Callis
- Â Captain Patrick Fleming 5 episodes, 2006
- Richard Armitage
- Â Capt. Ian Macalwain 5 episodes, 2003
- Liam Garrigan
- Â Ed Dwyer 4 episodes, 2005
- Jamie Michie
- Â Finn Younger 4 episodes, 2006
- Hannah Yelland
- Â Kathy Crampton 3 episodes, 2005
- Chris Ryan
- Â Sgt. Johnny Bell 3 episodes, 2002
- Tobias Menzies
- Â Box 500 3 episodes, 2002
- Liz White
- Â Beth Dow 3 episodes, 2002-2003
- Paul Broughton
- Â Conrad Boyd 3 episodes, 2002-2003
- Scott Moutter
- Â Peter Dow 3 episodes, 2002-2003
- Danielle King
- Â Bar Girl / ... 3 episodes, 2002-2006
- Alex Caan
- Â Hassan / ... 2 episodes, 2003-2006
- Anna-Louise Plowman
- Â Braun / ... 2 episodes, 2002-2006
- Adam Fogerty
- Â Rostrum / ... 2 episodes, 2002-2006
- Goran Kostic
- Â Eli / ... 2 episodes, 2002-2006
- Christopher Simon
- Â Samir 2 episodes, 2002-2006
- Laurence Fox
- Â Cpl. Mick Sharp 2 episodes, 2002
- Glyn Lewis
- Â Jack Boyd / ... 2 episodes, 2003-2005
- Caroline Trowbridge
- Â Brenda 2 episodes, 2003
- Pascal Langdale
- Â LeCompte 2 episodes, 2003
- Peter Vollebregt
- Â Willem Montagne 2 episodes, 2003
- William Hope
- Â Bob Schulman 1 episode, 2006
- Benn Northover
- Â Pc Betts 1 episode, 2005
- John Schwab
- Â Pincher 1 episode, 2006
- Anthony Howell
- Â Cpl. Sam Leonard 1 episode, 2002
- Martin McDougall
- Â McMullin 1 episode, 2006
- Trevor White
- Â Ritzik 1 episode, 2006
- Justin Allder
- Â Barbella 1 episode, 2006
- Peter Wight
- Â Bill Jackson 1 episode, 2002
- Josh Dallas
- Â Weaver 1 episode, 2006
- Matthew Scurfield
- Â Commander Russell 1 episode, 2002
- William Meredith
- Â Fender 1 episode, 2006
- Ian Shaw
- Â SOCO 1 episode, 2002
- Steve Chaplin
- Â Storeman 1 episode, 2002
- Phaldut Sharma
- Â Benali 1 episode, 2006
- Tom Georgeson
- Â Brian Duggan 1 episode, 2002
- Qaseem Ansari
- Â Sniper 1 episode, 2006
- Eddie Marsan
- Â Badger 1 episode, 2002
- Kal Mansoor
- Â School House Guard 1 episode, 2006
- Francis Magee
- Â Lofty 1 episode, 2002
- Robert Willox
- Â Pug 1 episode, 2002
- Russell Tovey
- Â Weasel 1 episode, 2002
- Paul Viragh
- Â Don Brown 1 episode, 2002
- Rory Kinnear
- Â Policeman 1 episode, 2002
- Rynagh O'Grady
- Â Mary 1 episode, 2002
- Hilda Braid
- Â Bank Customer 1 episode, 2002
- Nathan Naylor
- Â Paul 1 episode, 2002
- Sophie Winkleman
- Â Woman in Bank 1 episode, 2002
- Matt Acheson
- Â Man in Bank 1 episode, 2002
- Sam Troughton
- Â Stuart 1 episode, 2002
- Ruth Bradley
- Â Georgia Gracey 1 episode, 2002
- Neil Jackson
- Â Luke 1 episode, 2002
- Andreas Wisniewski
- Â Glasnovic 1 episode, 2002
- Aaron McCusker
- Â Matt Shaunessy 1 episode, 2002
- David Wilmot
- Â Fintan Maguire 1 episode, 2002
- Sean Gilder
- Â Mick Sweeney 1 episode, 2002
- Jamie Sives
- Â Simon 1 episode, 2002
- Dragan Micanovic
- Â Ruslan 1 episode, 2002
- Dermot Crowley
- Â Jack Cullen 1 episode, 2002
- Carmen Du Sautoy
- Â Mrs. Leonard 1 episode, 2002
- Nick Dunning
- Â Smith 1 episode, 2002
- Damian O'Hare
- Â Sean Weir 1 episode, 2002
- Velibor Topic
- Â Haradic 1 episode, 2002
- Jonathan Coy
- Â Griffin 1 episode, 2002
- Paul Brennen
- Â DI Wallace 1 episode, 2002
- Madeleine Worrall
- Â Lorraine 1 episode, 2002
- David Kennedy
- Â Flint 1 episode, 2002
- Alex Palmer
- Â Billy Critchley 1 episode, 2002
- Clare Cathcart
- Â Mary 1 episode, 2002
- Jack Pierce
- Â Interrogator 1 episode, 2002
- Jason Milligan
- Â George 1 episode, 2002
- Inday Ba
- Â Flossie 1 episode, 2002
- Sarah Paul
- Â Ellen 1 episode, 2002
- Ana Sofrenovic
- Â Masha 1 episode, 2002
- Cara Kelly
- Â Vanessa 1 episode, 2002
- Barney Craig
- Â Rod 1 episode, 2002
- Colum Convey
- Â Steven Gelder 1 episode, 2002
- Tommie Grabiec
- Â Glasnovic Elite Guard 1 episode, 2002
- Serge Soric
- Â Moussa 1 episode, 2002
- Liam McKenna
- Â Para Captain 1 episode, 2002
- Lawrence Elman
- Â Major Robin 1 episode, 2002
- Martin Troakes
- Â Security Guard 1 episode, 2002
- Paula Hamilton
- Â Helen Gracey 1 episode, 2002
- Rad Lazar
- Â Sergei 1 episode, 2002
- Rob Heyland
- Â Vicar 1 episode, 2002
- Jane Wheldon
- Â Doctor 1 episode, 2002
- Josh Cole
- Â Roger Trent 1 episode, 2002
- Colin Gourley
- Â MI5 Man 1 episode, 2002
- Paul Moody
- Â Tony 1 episode, 2002
- Tommy Carey
- Â Man in Pub 1 episode, 2002
- Colm Gormley
- Â Policeman 1 episode, 2002
- Siobhan Contreras
- Â Bar Owner 1 episode, 2002
- Danny Ponton
- Â Para 4 1 episode, 2002
- Joseph Crilly
- Â Bill Gracey 1 episode, 2002
- Mirko Sekulic
- Â Dude 1 episode, 2002
- Thomas Brodie-Sangster
- Â Gabriel 1 episode, 2003
- Kathryn Drysdale
- Â Susannah 1 episode, 2003
- Flora Montgomery
- Â Suzi Brown 1 episode, 2003
- Donald Sumpter
- Â General Harkin 1 episode, 2003
- Michael Byrne
- Â Lord Argent 1 episode, 2003
- Emily Joyce
- Â Nicky Strong 1 episode, 2003
- Conor Mullen
- Â Omega 1 episode, 2003
- Michael Nardone
- Â John Magnusson 1 episode, 2003
- Rolf Saxon
- Â Art Spellman 1 episode, 2003
- David Ryall
- Â Lord Kendrick 1 episode, 2003
- Sara Kestelman
- Â Lady Lee 1 episode, 2003
- Ian Peck
- Â Police Officer 1 episode, 2003
- Stephen Boxer
- Â Mr. Walshe 1 episode, 2003
- Meredith MacNeill
- Â Jenny Lloyd 1 episode, 2003
- Jane Booker
- Â Barrister For French 1 episode, 2003
- Diana Kent
- Â Mrs. Walshe 1 episode, 2003
- Andrew Woodall
- Â Ministry Of Defence Lawyer 1 episode, 2003
- Dorian Healy
- Â Michael 'Mick Mo' Moriarty 1 episode, 2003
- George Cottle
- Â Georgian Gunman 1 episode, 2003
- Philip McGough
- Â Bisbury 1 episode, 2003
- Barbara Wilshere
- Â Sophie 1 episode, 2003
- Robert Gwilym
- Â Harrington 1 episode, 2003
- Alice Hart
- Â Ruth 1 episode, 2003
- David Crow
- Â Gary Farmer 1 episode, 2003
- Simon Gregor
- Â Levi 1 episode, 2003
- Paul Ridley
- Â Dovecote 1 episode, 2003
- Brendan O'Hea
- Â Oliver 1 episode, 2003
- David Hounslow
- Â Wallace Burton 1 episode, 2003
- Stephen Noonan
- Â Ben Yager 1 episode, 2003
- Jonathan Hackett
- Â Sgt. Forrester 1 episode, 2003
- Christopher Schönning
- Â Smiffy 1 episode, 2003
- Aleksandar Mikic
- Â 2nd Representative 1 episode, 2003
- François Guétary
- Â LeMaison 1 episode, 2003
- Boris Boscovic
- Â 1st Representative 1 episode, 2003
- Steve Hay
- Â Isaac 1 episode, 2003
- Quill Roberts
- Â Dr. Sharma 1 episode, 2003
- Ed Browning
- Â Craig Harris 1 episode, 2003
- Tom Bowles
- Â Kurt 1 episode, 2003
- Gordon Seed
- Â Georgian Gunman 1 episode, 2003
- Cosh Omar
- Â Crewman 1 episode, 2003
- Eilidh Fraser
- Â Nurse 1 episode, 2003
- Michael Tucek
- Â Stevenson 1 episode, 2003
- Peter Gevisser
- Â Stan 1 episode, 2003
- Emma Fildes
- Â WPC Jo Rossborough 1 episode, 2003
- Trevor Dwyer-Lynch
- Â Bouncer 1 episode, 2003
- Stephen Humby
- Â Pedestrian 1 episode, 2003
- Jack Tanner
- Â Mehmed 1 episode, 2003
- Robin Summers
- Â Supt. Gardiner 1 episode, 2003
- Jonathan Gabb
- Â David 1 episode, 2003
- Will Fali
- Â Abdul 1 episode, 2003
- Phillip Edgerley
- Â Dourte 1 episode, 2003
- Con O'Neill
- Â Lavelle 1 episode, 2005
- Lucian Msamati
- Â Blessed 1 episode, 2005
- Adam Croasdell
- Â Pierre Du Preez 1 episode, 2005
- Jeff Rawle
- Â Cox 1 episode, 2005
- Ace Bhatti
- Â Handsome 1 episode, 2005
- Peter Sullivan
- Â Vasily 1 episode, 2005
- Rod Hallett
- Â Toby 1 episode, 2005
- T.J. Ramini
- Â Drew Jordan 1 episode, 2005
- Polly Kemp
- Â Rosemary 1 episode, 2005
- Dearbhla Molloy
- Â Mary 1 episode, 2005
- Jonathan Linsley
- Â Eric 1 episode, 2005
- Deddie Davies
- Â Sylvia 1 episode, 2005
- Félicité Du Jeu
- Â Sophie Scott 1 episode, 2005
- Michael Thomas
- Â DAC Robert Barker 1 episode, 2005
- David Gillespie
- Â Reporter 1 episode, 2005
- Shirley Dixon
- Â Joan 1 episode, 2005
- Ian Duncan
- Â Hector Du Preez 1 episode, 2005
- Jalaal Hartley
- Â Alan 1 episode, 2005
- San Shella
- Â Zealot 1 episode, 2005
- Philip Wright
- Â DI Bernie Coleman 1 episode, 2005
- Vee Vimolmal
- Â Ellie 1 episode, 2005
- Lia Alu
- Â Hostage 1 episode, 2005
- Arturo Venegas
- Â Stefano Lupo 1 episode, 2005
- Richard Attlee
- Â Hugh 1 episode, 2005
- Keith Dunphy
- Â Para Lieutenant 1 episode, 2005
- Jonathan Chan-Pensley
- Â Teddy 1 episode, 2005
- Chike Chan
- Â Dipka 1 episode, 2005
- Jon Cartwright
- Â Alex Du Preez 1 episode, 2005
- Ting Ting Hu
- Â Mary 1 episode, 2005
- Shelley Borkum
- Â Sarah Du Preez 1 episode, 2005
- Eddie Osei
- Â Chondoki 1 episode, 2005
- Nigel Hoyle
- Â Barclay McDonald 1 episode, 2005
- Agnieszka Liggett
- Â Sapiyet 1 episode, 2005
- Charles Daish
- Â Trevor Dagg 1 episode, 2005
- Henrietta Clemett
- Â Check-In Girl 1 episode, 2005
- Simeon Andrews
- Â Alex Johnson 1 episode, 2005
- Saskia Butler
- Â Luanne Du Preez 1 episode, 2005
- Deborah O'Brien
- Â Bridget 1 episode, 2005
- Sonu Louis
- Â Chechnyan Rebel 1 episode, 2005
- Kwaku Ankomah
- Â Soldier 1 1 episode, 2005
- Jake Hendriks
- Â Paul Brown 1 episode, 2005
- John Milroy
- Â Mark 1 episode, 2005
- Sam Talbot
- Â Joe 1 episode, 2005
- Richard Saade
- Â Pro 1 episode, 2005
- Tatina de Marinis
- Â Trista Marrone 1 episode, 2005
- Matthew Cullum
- Â Travis 1 episode, 2005
- Nazim Kourgli
- Â Geek 1 episode, 2005
- Ilario Bisi-Pedro
- Â Didymus Nutasa 1 episode, 2005
- Michelle MacErlean
- Â Geraldine 1 episode, 2005
- Omid Gholami
- Â Heavy 1 episode, 2005
- Lathaniel Dyer
- Â Boy 1 episode, 2005
- John Adewole
- Â Gagmandawe 1 episode, 2005
- Krassimir Damianov
- Â Salim 1 episode, 2005
- Nekay Lewin
- Â Christmas 1 episode, 2005
- Jeroen Hendriks
- Â Paul Brown 1 episode, 2005
- Brandon Q W McConnell
- Â Terrorist 1 episode, 2005
- Gbolan Obisesan
- Â Soldier 2 1 episode, 2005
- Kristian Nincic
- Â Movzar 1 episode, 2005
- Pavel Rimburg
- Â Akim 1 episode, 2005
- Tuyet Le
- Â Devi 1 episode, 2005
- Wing Li
- Â Ram 1 episode, 2005
- Tony Arunah Abbey
- Â SAS Soldier 1 episode, 2005
- Tom Bennett
- Â Millar 1 episode, 2006
- Daniel Betts
- Â Slava 1 episode, 2006
- Ronan Vibert
- Â Griffin 1 episode, 2006
- Simon Kassianides
- Â Juan 1 episode, 2006
- Joe Sims
- Â Vic 1 episode, 2006
- Robbie Gee
- Â Monty 1 episode, 2006
- Matt Rippy
- Â Haley 1 episode, 2006
- Nicholas Aaron
- Â Raas 1 episode, 2006
- Ricci Harnett
- Â Spencer 1 episode, 2006
- Adam Howden
- Â Student 1 episode, 2006
- Chris Wilson
- Â Police ARO 1 episode, 2006
- Valentine Pelka
- Â Bundarczuk 1 episode, 2006
- Flaminia Cinque
- Â Mrs Guggenheim 1 episode, 2006
- Simon Meacock
- Â Davy 1 episode, 2006
- Buffy Davis
- Â Mom 1 episode, 2006
- Francisco Labbe
- Â Jose 1 episode, 2006
- Paul Brightwell
- Â Konchalovsky 1 episode, 2006
- Erik Madsen
- Â Ghisbert 1 episode, 2006
- Crispin Redman
- Â William Medford 1 episode, 2006
- David Verrey
- Â Police Officer 1 episode, 2006
- Mark Arden
- Â Thirsty 1 episode, 2006
- Flip Webster
- Â Mrs. Hoffman 1 episode, 2006
- Jane Wood
- Â Mrs. Dwyer 1 episode, 2006
- George Rossi
- Â Mejia 1 episode, 2006
- Richard Syms
- Â Train Passenger 1 episode, 2006
- William Tapley
- Â Burton 1 episode, 2006
- Jasper Jacob
- Â Dieter 1 episode, 2006
- Simon Lenagan
- Â Lodder 1 episode, 2006
- Sarah Moyle
- Â Lynette 1 episode, 2006
- Jason Morell
- Â Cabinet Officer 1 episode, 2006
- Jordan Metcalfe
- Â Byron 1 episode, 2006
- Toby Parkes
- Â Liam 1 episode, 2006
- Ozzie Yue
- Â Japanese Tourist 1 1 episode, 2006
- Naomi Cooper-Davis
- Â Iris 1 episode, 2006
- Russell Levy
- Â Boss 1 episode, 2006
- Nasreen Hussain
- Â Passport Control Officer 1 episode, 2006
- Andy Gillies
- Â Guard 1 episode, 2006
- Julia Marsen
- Â Fiona Malek 1 episode, 2006
- Sebastian Knapp
- Â Santa Rosa 1 episode, 2006
- Julian Rivett
- Â Klimov 1 episode, 2006
- Glyn Grain
- Â Chief Superintendent 1 episode, 2006
- Ashley Campbell
- Â CK 1 episode, 2006
- Gary Finan
- Â George 1 episode, 2006
- John Warman
- Â Train Passenger 1 episode, 2006
- Adam Kirley
- Â Parnell 1 episode, 2006
- Lucas Hare
- Â Technician 1 episode, 2006
- Daren Elliott Holmes
- Â CNC Security 1 episode, 2006
- Jason Griffiths
- Â Foreman 1 episode, 2006
- Igor Urdenko
- Â Mikhailov 1 episode, 2006
- Ben Macleod
- Â Scottish Kid 1 episode, 2006
- Marcos D'Cruze
- Â Receptionist 1 episode, 2006
- Clare Lawrence Moody
- Â Dr. Warner 1 episode, 2006
- Matthew Earley
- Â Guggenheim 1 episode, 2006
- Emory Ruegg
- Â Graham 1 episode, 2006
- Sean Wightman
- Â Technician 1 episode, 2006
- Robert Hunt
- Â Jenks 1 episode, 2006
- Will Norris
- Â Ernesto 1 episode, 2006
- Seema Imantabari
- Â Aisha Malek 1 episode, 2006
- Vincent Carmichael
- Â Passport Control Officer 1 episode, 2006
- Richard Klvac
- Â Tarkovsky 1 episode, 2006
- Tim Major
- Â RR Team Leader 1 episode, 2006
- Michael Snelders
- Â Bunker Technician 1 episode, 2006
- Roberto Viana
- Â Miguel 1 episode, 2006
- Joe Fererra
- Â Almonte-Pena 1 episode, 2006
- Ramon Chamadoira
- Â Columbian 1 episode, 2006
- Andres Ortiz
- Â Young Colombian 1 episode, 2006
- Mark McKerracher
- Â Pop 1 episode, 2006
- Neena Hougham
- Â Farah Malek 1 episode, 2006
- Jack Warren
- Â Freddy 1 episode, 2006
- Cristian Cardenas
- Â Emilio 1 episode, 2006
- Richard Stacey
- Â Negociator 1 episode, 2006
- Nick Hussey
- Â SAS Trooper (uncredited) 6 episodes, 2002
- Michael Feast
- Â Martin Bartlett (uncredited) 1 episode, 2003
- Panayiota Panteli
- Â Woman Driver (uncredited) 1 episode, 2005
- Christopher Fosh
- Â Undercover Special Branch Armed Police Officer (uncredited) 1 episode, 2006
- John De Luca
- Â Bartender (uncredited) 1 episode, 2006
- Aldonio Danny Freitas
- Â Dragons breath platoon (uncredited) 1 episode, 2006
- Ameer Choudrie
- Â Terrorist (uncredited) 1 episode, 2006