Naomie Harris

Heather

Natalie Dormer

Carla

Dominic Allburn

Simon

Leah Mondesir-Simmonds

Young Heather

Olivia Juno Cleverley

Young Carla

Rupert Holliday-Evans

Jim

Jack Morris

Tel

Jake Donald-Crookes

Jake

Isobel Hawkridge

Ruby

Sally Goodman

Supermarket Customer

Naomi Richards

Helen

Nadia Williams

Jane

Alice Grace

Ruby's Mother

Evelyn Temple

Ruth

Beau Plested

Toby

Nikola Kent

"Logan"

Evelyn Smith

Young Heather and Carla's Schoolfriend

Alexander Squires

Young Heather and Carla's Schoolfriend

Harrison Metcalfe

Young Heather and Carla's Schoolfriend

Matilda Clarke

Disco Bully

Mia Rose Lightfoot

Disco Bully

Scarlett Moore

Disco Bully

Evelyn Morris

School Student (uncredited)

Eire Farrell

School Bully (uncredited)

Lilly-Anne Marston-Smith

Carla's Daughter (uncredited)