| Henry Pettigrew | Cole |
| Sacha Dhawan | Prasad
(as Sacha Dawan) |
| Keeley Hawes | Lindsay |
| Adrian Dunbar | Hastings |
| Martin Compston | Arnott |
| Vicky McClure | Fleming |
| Craig Parkinson | Cottan |
| Julia Krynke | Kasia |
| Mark Bonnar | Dryden |
| Tony Pitts | Hargreaves |
| Chetna Pandya | New Jo |
| Laura Hughes | Nurse |
| Neil Morrissey | Morton |
| Tara Flynn | Defence |
| Niall Cusack | Judge |
| Matt Faris | Clerk
(as Matthew Faris) |
| Fo Cullen | Prosecution |
| Charlotte Spencer | Carly |
| Andrea Irvine | Roisin |
| Paula McGlinchey | Dryden's Solicitor |
| Chrissie Harris | Police Officer AC-12
(uncredited) |
| Christine Harris | AC 12 Uniformed Officer
(uncredited) |
| Hugh Irvine | CSI Officer Burslem
(uncredited) |
| Jessica Raine | DC Georgia Trotman
(archive footage) (uncredited) |