Naomie Harris as Heather

Natalie Dormer as Carla

Dominic Allburn as Simon

Leah Mondesir-Simmonds as Young Heather

Olivia Juno Cleverley as Young Carla

Rupert Holliday-Evans as Jim

Jack Morris as Tel

Jake Donald-Crookes as Jake

Isobel Hawkridge as Ruby

Sally Goodman as Supermarket Customer

Naomi Richards as Helen

Nadia Williams as Jane

Alice Grace as Ruby's Mother

Evelyn Temple as Ruth

Beau Plested as Toby

Nikola Kent as "Logan"

Evelyn Smith as Young Heather and Carla's Schoolfriend

Alexander Squires as Young Heather and Carla's Schoolfriend

Harrison Metcalfe as Young Heather and Carla's Schoolfriend

Matilda Clarke as Disco Bully

Mia Rose Lightfoot as Disco Bully

Scarlett Moore as Disco Bully

Evelyn Morris as School Student (uncredited)

Eire Farrell as School Bully (uncredited)

Lilly-Anne Marston-Smith as Carla's Daughter (uncredited)