 | Benedict Cumberbatch als Stephen Lewis |
 | Kelly Macdonald als Julie Lewis |
 | Stephen Campbell Moore als Charles Darke |
 | Saskia Reeves als Thelma Darke |
 | Andrea Hall als Policewoman |
 | Jim Creighton als Male Neighbour |
 | Beatrice White als Kate Lewis |
| Rosa-Marie Lewis als Shop Assistant |
 | Franc Ashman als Lydia Webb |
 | Anna Madeley als Rachel Murray |
 | John Hopkins als Home Secretary |
 | Elliot Levey als Prime Minister |
 | Lucy Liemann als Joanna Buckley |
| Natasha Brown als Steven's Young Mother |
 | Laurence Spellman als Greg Ellis |
 | Richard Durden als Stephen's Father |
 | Geraldine Alexander als Stephen's Mother |
 | Gerard Monaco als Estate Agent |
| Tony Walker als Taxi Driver |
| Chase Collard als Ruth Lyle |
| Gehane Strehler als Mrs. Forrester |
 | Karen Bryson als Mrs. Matterson |
 | Doreene Blackstock als Nurse |
 | Eloise Henwood als School Girl (uncredited) |
| Helen Gregory | Executive Producer |
| Benedict Cumberbatch | Executive Producer |
| Stephen Butchard | Writer |
| Adam Ackland | Executive Producer |
| Grainne Marmion | Producer |
| David Boulter | Executive Producer |
| Julian Farino | Director |
| Mark Ellis | Location Manager |
| Phil Smith | Dressing Prop |
| Sam Spurgeon | Digital Imaging Technician |
| Damian Cooper | Electrician |
| Thomas Barratt | Dressing Prop |
| Malcolm Crowe | Assistant Editor |
| Vincent Narduzzo | Colorist |
| Glen Gathard | Supervising Sound Editor |
| Simon Elliott | Production Design |
| Lucy Richer | Executive Producer |
| Dan Marsden | Production Runner |
| Lucie Blundell Jones | Makeup Artist |
| Sarah Parfitt | Post Production Supervisor |
| Rebecca Eaton | Executive Producer |
| Eman Kazemi | Third Assistant Director |
| Elizabeth Walker | Production Accountant |
| Guy Bevitt | Art Direction |
| Stephanie Odu | Assistant Art Director |
| Adam Cheetham | Grip |
| Peter Hanson | Sound Effects Editor |
| Ben Baird | Sound Re-Recording Mixer |
| Caroline Reilly | Standby Art Director |
| Neal Champion | Special Effects Supervisor |
| Simon Midgley | Specialized Driver |
| Keith Madden | Costume Design |
| Adrian Johnston | Original Music Composer |
| Andy Barden | Property Master |
| Alana Marmion-Warr | Script Supervisor |
| Andy Davies | Unit Manager |
| Karen Hartley-Thomas | Hair Designer |
| Michael Winter | Production Executive |
| James Chambers | Third Assistant Director |
| Jill Trevellick | Casting Director |
| John Mooney | Sound Recordist |
| David Odd | Director of Photography |
| Luke Tumber | Stunts |
| Lizzie Evans | Production Secretary |
| Callum Andrews | Construction Manager |
| Kilian Drury | Electrician |
| Caroline Greenough | Makeup Supervisor |
| Kristina Hetherington | Editor |
| Yvonne Lloyd | Art Department Assistant |
| Jay Derham | Specialized Driver |
| Stephanie Bamberg | Head of Production |
| Debbie Bowser | First Assistant Director |
| Emma Friend | First Assistant Camera |
| Susie Lewis | Costume Supervisor |
| Arthur Graley | Sound Effects Editor |
| Mark Bellett | Specialized Driver |
| Kathy Nettleship | Line Producer |
| Stephen Butchard | Executive Producer |
| Olwyn Fagan | Floor Runner |
| Elliott Caen | Location Assistant |
| Emma Davis | Set Decoration |
| Mairead Albiston | Second Assistant Camera |
| Ben Lowe | Grip |
| Georgia Gray | Makeup Trainee |
| Laurie Sparham | Still Photographer |
| Emlyn Pool | Second Assistant Director |
| Ashley Turner | Floor Runner |
| Craig Elderfield | Standby Carpenter |
| Todd Pacey | Camera Trainee |
| Jamie Whickman | Best Boy Electric |
| Delroy Burley | Electrician |
| Bradley Kendrick | Boom Operator |
| Joe Malone | Sound Assistant |
| Ian McEwan | Novel |
| Tom Barnes | Assistant Location Manager |
| Carolina Schmidtholstein | Gaffer |
| David Chisholm | Online Editor |
| Julian Chapman | Transportation Captain |
| Karen Hartley-Thomas | Makeup Designer |
| Jim Dowdall | Stunt Coordinator |
| Raphi Randall | Assistant Editor |
| Claire Marshall | Script Editor |
| Philippa Broadhurst | Graphic Designer |
| Emma Fisher | Petty Cash Buyer |
| Sarah Counsell | Casting Assistant |
| Brian Wilson | Specialized Driver |
| Rosie Dias | Production Coordinator |
| Lizzy Carr | Production Runner |
| Rhys Grinter | Standby Rigger |
| Hollie Danby | Wardrobe Master |
| Charlie Best | Still Photographer |
| John Hall | Specialized Driver |
| John Bradford | Specialized Driver |
