Gemma Chan Hannah Actor Vicky McClure Nicola Actor, Writer Samantha Morton Kirsty Actor Ed Coleman Tom Actor Paul Kaye Ryan Actor Leanne Best Ava Actor Perry Fitzpatrick Adam Actor Arinzé Kene James Actor Sam Spruell Barry Actor Sarah Lam Sally Actor David Mumeni Will Actor Kiran Sonia Sawar Rebecca Actor Jeany Spark Kate Actor Dominic Savage Writer, Director, Executive Producer Krishnendu Majumdar Producer, Executive Producer Richard Yee Executive Producer