Joe Anders as George

Samuel Paul Small as Max

Susan Wokoma as Andi

Ellie Kendrick as Donna

Josh O'Connor as Jonno

Ray Panthaki as Mr. Zeppelin

Elle McCloskey as Molly

Ciara Southwood as Polly

Josh Cowdery as Toby

Roger Evans as Alan

Nina Wadia as Headmistress

Colin Salmon as Mike Marvin

Alison Sudol as Julia

Jack Davenport as Jeffrey

Sue Lawley as Sue Lawley (voice)

Bill Milner as Skinny Rick

Rebecca Osias as Mrs. McLaughlin

Adam Darlington as Journalist 1

Jennifer Lane as Lara the Avante Garde Dancer

Connor Boyles as Mr. Boyles

Sophie Mack Smith as Miss Summerville

Jeremy Loveless as Mr. Maddox

Stephen Sandwell as Mr. Johnson

Richard Thomson as Mr. Jenkins

Sophia Ching as Miss Rathmill

Savannah Power as Mademoiselle Lacroix

Mike Gilbert as Mr. Hugill