| Guest Stars |
| •Alex Hughes | played | Teacher | Recurring (first appearance) |
| •Amymay Bowes | played | Nurse | Recurring (first appearance) |
| •Anton Lesser | played | Marcus Gwilym | Recurring (first appearance) |
| •Billy Hill (1) | played | Paul Williams | Recurring (first appearance) |
| •David Harewood | played | Angus Stuart | Recurring (first appearance) |
| •Emma Handy | played | DS Gwenda Newton | Recurring (first appearance) |
| •Graham O'Mara | played | Man on Slab | Recurring (first appearance) |
| •Ian Peck | played | Daryl Butler | Recurring (first appearance) |
| •Kate Fleetwood | played | Sienna Ricci | Recurring (first appearance) |
| •Nathalie Press | played | Nicola Butler | Recurring (first appearance) |
| •Ozzie Yue | played | Micky Choo | Recurring (first appearance) |
| •Peter Wight | played | Lucas Garner | Recurring (first appearance) |
| •Philip Bird | played | DCI Jim Tennant | Recurring (first appearance) |
| •Phyllis Logan | played | Helen Wharton | Recurring (first appearance) |
| •Rebecca Bridges | played | Lanny Forbes | Recurring (first appearance) |
| •Sam Friend | played | Pat | Recurring (first appearance) |
| •Tom Wu | played | Dr. Yip | Recurring (first appearance) |
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