| Name | Character | Episodes |
|---|---|---|
| Kerry Condon | Sister Siobhan Doole | 10 |
| Janet McTeer | DS Amy Foster | 10 |
| David Morrissey | DI Mal Craig | 10 |
| Hugh Bonneville | DSI Iain Barclay | 10 |
| Suranne Jones | PC Laurie Franklin | 10 |
| Patrick Malahide | John Poole | 10 |
| Rory Kinnear | Kyle Betts | 10 |
| Richard Harrington | Daf Parry | 10 |
| David Oyelowo | Matt Wellings | 10 |
| Sarah Smart | Sarah Wheeler | 10 |
| Hugo Speer | Supt Jim Carpenter | 10 |
| Anne Reid | Jen Mason | 10 |
| Al Weaver | Josh Fairley | 10 |
| Penelope Wilton | Barbara Poole | 10 |
| Bernard Hill | Gerard Hopkirk | 10 |
| Edward Woodward | Vic Marsham | 10 |
| Navin Chowdhry | Bilal Choudry | 10 |
| Derek Riddell | Nick Durden | 10 |
| Charlie Creed-Miles | DC Stephen Beam | 10 |
| Christine Tremarco | Leanne Wellings | 10 |
| Philip Arditti | Dr. Adel Haydar | 10 |
| Steve Evets | Pat Dowling | 10 |
| Lucinda Dryzek | Tanya Wellings | 10 |
| Phil Davis | Mic Danes | 2 |
| Phil Davis | 0 |