| Name | Character | Episodes |
|---|---|---|
| Gugu Mbatha-Raw | Jane | 4 |
| Ben Hardy | Simon | 4 |
| David Oyelowo | Edward | 4 |
| Mark Stanley | Saul | 4 |
| Rakhee Thakrar | Mia | 4 |
| Amanda Drew | Carol | 4 |
| Ian Conningham | DI James Clarke | 4 |
| Jessica Kate Plummer | Emma | 4 |
| Ben Addis | Peter Creed | 4 |
| Lucy Russell | Rachel | 2 |
| Lisa Faulkner | Tessa | 2 |
| Jason Thorpe | John Broome | 2 |
| Luke Norris | Paul Ellis | 2 |
| Natasha Atherton | Leona | 2 |
| Stewart Scudamore | Professor Summerfield | 1 |
| Sam Hoare | Charlie | 1 |
| Katy Carmichael | Linda Waugh | 1 |
| Mia Soteriou | Sue McCann | 1 |
| Antonia Clarke | Alyssa | 1 |
| Georgia Landers | Elizabeth Monkford | 1 |
| Anna Leong Brophy | Belinda | 1 |
| David Mumeni | Mark | 1 |