| Name | Character | Episodes |
|---|---|---|
| Toby Stephens | DI Jack Armstrong | 9 |
| Roger Griffiths | Tony | 9 |
| Ronny Jhutti | Naz Omar | 9 |
| Miranda Raison | DI Georgina Dixon | 6 |
| Nick Dunning | Peter Dixon | 6 |
| Lucy Punch | DI Kate Bishop | 3 |
| Rory Kinnear | Dan Bishop | 3 |
| Eleanor Matsuura | Emma | 1 |
| Del Synnott | Richard Anderson | 1 |
| Richard Lumsden | Jeff | 1 |
| Michael Hough | Leo Clarke | 1 |
| Phil Davis | Ron Poynter | 1 |
| Susannah Doyle | Sue Goretti | 1 |
| Frances Barber | Pat Poynter | 1 |
| Christopher Fulford | Dave | 1 |
| Richard Cant | Billy | 1 |
| Fiona O'Shaughnessy | Sarah Stockwood | 1 |
| Adam James | Charlie Brewer | 1 |
| Daniel Lapaine | Bob | 1 |
| Mark Huberman | Ryan | 1 |
| Kevin Doyle | Andrew Bridgely | 1 |
| Patrick Baladi | Mark Armstrong | 1 |
| Amanda Douge | Charlotte | 1 |
| Sian Brooke | Suzie Miller | 1 |
| Louise Delamere | Lucy Finch | 1 |
| Jumayn Hunter | Billy (mugger) | 1 |
| Emma Davies | Elaine | 1 |
| Brian McCardie | Robert Randall | 1 |
| Jayne Wisener | Lucy B | 1 |
| Sarah Jane Seymour | Abi de Hoyzen | 1 |
| Dylan Brown | John-Paul | 1 |
| Naoko Mori | Saatchi Kyoto | 1 |
| Jenny Jules | Dr. Lawrence | 1 |
| Ashley Artus | Tim | 1 |
| Jonathan Slinger | Kevin | 1 |
| Eloise Joseph | Beth McKenzie | 1 |