| Name | Character | Episodes |
|---|---|---|
| Louise Brealey | Cass | 12 |
| Penny Downie | Ellen | 12 |
| Oliver Maltman | Mike | 12 |
| Robert Webb | Andrew | 12 |
| David Mitchell | Stephen | 12 |
| Olivia Poulet | Alison | 12 |
| Jessica Gunning | Jan | 12 |
| John Macmillan | Julian | 6 |
| Michael Wildman | Tom | 6 |
| Geoffrey McGivern | Uncle Geoff | 6 |
| Matthew Holness | Laurie | 6 |
| Anthony Stewart Head | Charismatic Mike | 1 |