Theo Stevenson
Horrid Henry
Richard E. Grant
Vic Van Wrinkle
Parminder Nagra
Miss Lovely
Prunella Scales
Great Aunt Greta
Jo Brand
Demon Dinner Lady
Helen Lederer
Rich Aunt Ruby
Kimberley Walsh
Prissy Polly
Anjelica Huston
Miss Battleaxe
Scarlett Stitt
Moody Margaret
Billy Kennedy
Weeping William
Nethra Tilakumara
Singing Soraya
Nikita Mistry
Gorgeous Gurinder
Joshua-James Thomas
Goody Goody Gordon
Tyger Drew-Honey
Stuck-up Steve
Lily Demetriou Ottaway
Vomiting Vera
Sasha Demetriou Ottaway
Vomiting Vera
Tamsin Heatley
Madam Tutu / Fang
Lizzie Waterworth
Nitty Nora
Metin Ahmet
School Inspector 1
Timur Ahmet
School Inspector 2
Dominic Wood
2C4S Presenter 1
Richard McCourt
2C4S Presenter 2
Philip Pope
Moody Margaret's Dad
Andrew Cameron
Crooked Corner Manager
Bella Watts
Giddiantus Girl 1
Catherine Forde
Giddiantus Girl 2
Luisa Watts
Giddiantus Girl 3
Tobi Coventry
Business For Boys Presenter 1
Tom Hodder
Business for Boys Presenter 2
Joe Bowman-Cole
Talent Contest Band
Caleb Hope-Rich
Talent Contest Band
Nathaniel Pacanowski
Talent Contest Band
Toby Dickinson-Williams
Talent Contest Band
Melissa de Winter
Schoolgirl
Zizo
Nikita Mistry's boyfriend