Naomie Harris

Character: Heather

Natalie Dormer

Character: Carla

Dominic Allburn

Character: Simon

Leah Mondesir-Simmonds

Character: Young Heather

Olivia Juno Cleverley

Character: Young Carla

Rupert Holliday-Evans

Character: Jim

Jack Morris

Character: Tel

Jake Donald-Crookes

Character: Jake

Isobel Hawkridge

Character: Ruby

Sally Goodman

Character: Supermarket Customer

Naomi Richards

Character: Helen

Nadia Williams

Character: Jane

Alice Grace

Character: Ruby's Mother

Evelyn Temple

Character: Ruth

Beau Plested

Character: Toby

Nikola Kent

Character: "Logan"

Evelyn Smith

Character: Young Heather and Carla's Schoolfriend

Alexander Squires

Character: Young Heather and Carla's Schoolfriend

Harrison Metcalfe

Character: Young Heather and Carla's Schoolfriend

Matilda Clarke

Character: Disco Bully

Mia Rose Lightfoot

Character: Disco Bully

Scarlett Moore

Character: Disco Bully

Evelyn Morris

Character: School Student (uncredited)

Eire Farrell

Character: School Bully (uncredited)

Lilly-Anne Marston-Smith

Character: Carla's Daughter (uncredited)