| Name | Character | Episodes |
|---|---|---|
| Olivia Colman | Deborah Flowers | 12 |
| Will Sharpe | Shun | 12 |
| Sophia Di Martino | Amy Flowers | 12 |
| Anna Chancellor | Viv | 12 |
| Julian Barratt | Maurice Flowers | 12 |
| Daniel Rigby | Donald Flowers | 12 |
| Angus Wright | George | 12 |
| Zita Sattar | Barbara | 12 |
| Leila Hoffman | Nana | 6 |
| Georgina Campbell | Abigail | 6 |
| Desiree Akhavan | Carol | 5 |
| Duncan Pow | Dennis | 2 |
| Simon Munnery | Taxi Driver | 1 |