- Francesca Simonbased on characters created by
- Lucinda Whiteleyscreenplay
- Zac Gabriel Werb(as Gabriel Werb)
- Lizzie Waterworth(as Elizabeth Waterworth-Santo)
- Akai Osei(as Akai)
Rest of cast listed alphabetically
- Keely Cat-Wells(as a different name)
- Melissa de Winter(uncredited)
- Herbie Kinsey(uncredited)
- Freddie Rose(uncredited)
- Amber Vertannes(uncredited)
- Harvey Walsh(uncredited)
- Zizo(uncredited)
- Keri Atkinsassociate producer: for Novel Entertainment
- Claire Barryanimation line producer: for Novel Entertainment
- Paul Brettexecutive producer: for Prescience
- Doug Langdaleco-producer
- Caroline Levyco-producer
- Allan Nibloexecutive producer
- Rupert Prestonproducer
- James Richardsonexecutive producer
- James Swarbrickexecutive producer: for Aegis
- Huberta Von Lielin-house producer: for Vertigo Films
- Mike Wattsexecutive producer
- Lucinda Whiteleyproducer
- Nigel Williamsexecutive producer
- Lester Barnescomposer (uncredited)
- Sophie Bricehead crowd makeup artist
- Jemma Carballomakeup artist
- Lauren Katie Coxhair trainee
- Annette Fieldhair colourist: for Theo Stevenson and Ross Marron
- Angie Mudgemake-up and hair designer
- Nicola O'Rourkeassistant makeup artist (as Nicola Thomas)
- Zoe Pocockmanicurist
- Jacqueline Rathorehairdresser: dailies (as Jacqui Rathore)
- Adrian Rigbyprosthetic makeup artist
- Charlotte Rogershair and make up artist
- Richard Hardwickunit manager
- Ruth Hodgsonhead of post production: Film Finances
- Louise Killinproduction manager
- David Kordaproduction: Film Finances
- Fiona Morhamhead of production: UK Film Council
- Linda Patherproduction: monitoring supervisor: Film Finances
- Tussy Facchinthird assistant director
- Ben Howardsecond assistant director
- Andrew Manniondaily crowd assistant director
- Alex Abelmancarpenter
- Rebecca Amissahart department assistant (as Rebecca Bernice Amissah)
- Rob Andersonconstruction manager
- Caroline Baileygraphics designer
- Tony Bandydressing props (as Anthony Bandy)
- Hannah Boytonscenic artist
- John Colebourngraphic artist / storyboard artist
- Simon Cookdressing props
- Josh Hartnettstandby props
- Naomi Dandridgerecording engineer
- Adele Fletcheradr editor
- Elliott Gilhoolysound assistant
- Johannes Hampelfoley recordist
- Eric Horstmannre-recording stage engineer
- Manuel Lavalsound designer
- Stephen Longstaffboom operator
- Sabrina Naumann-Reichowdialogue editor (as Sabrina Naumann)
- André Reichowfoley editor
- Peter Roigkfoley artist
- Steve Lucasspecial effects supervisor
- Jean-Michel BoublilVFX artist: The Post Republic
- Felix DamesVFX artist: The Post Republic
- Martin Eichhorntitle design
- Brian Eleytitle sequence: 2C4S
- Rudolf GermannVFX artist: The Post Republic (as Rudi Germann)
- Alastair Grimshawvisual effects supervisor
- Jonas Jangvadstereo artist: 3D
- Duncan Kinnairdvisual effects artist
- Florian ObrechtVFX artist: The Post Republic / digital lab supervisor: 3D
- Gregor Pfüller3D conforming: The Post Republic / 3D online: The Post Republic
- Jack Ambrosebody double: Horrid Henry
- Tack Baldwinhead wire technician
- Angela Cookbody double: Great Aunt Greta
- Alex Larderbody double: Perfect Peter
- Tony Luckenstunt coordinator
- Minoo Meinenstunt double: Horrid Henry
- Gordon Seedstunt double: Soggy Sid
- Georgia Sitwellbody double: Moody Margaret
- Julian Spencerstunt coordinator
- Jon Beachamcamera operator: "b" camera
- Sergio Bernuzzikey grip
- Trevor Chaistybest boy
- Danny Connewadditional epk cameraman
- Liam Danielstills photographer
- Simon De Glanvillesecond unit stereographer
- Mike Druryjimmy jib operator
- Wezley Joao Ferreiraassistant third digital imaging technician
- Halem Firatlighting
- Claire Louise Frasercamera trainee
- Rachel Adamsoncasting: supporting adult artists
- Daniel Edwardscasting assistant
- Millie Scalchicasting assistant: for Gary Davy
- Lora Avediancostume prop maker
- Cressida Connollycostume trainee
- Jessica Phillipsset costumer trainee
- Sunny Rowleycostume supervisor
- Sophia Spinkassistant costume designer
- Jaclyn Tamizatocostume assistant: daily
- Helen Vinescostume stand-by
- Julian Andrausassistant editor
- Jim Andrewsanimation editor: for Novel Entertainment
- Rachael Ellispost production coordinator: The Post Republic
- Rebekka Garridopost production supervisor: The Post Republic
- Bernie Greinersenior colourist: The Post Republic
- Louise Killinpost production coordinator: The Post Republic
- Nadir Mansouricolourist: The Post Republic
- Caite Ni'Ceileachairpost production coordinator: The Post Republic
- Alyson Pengellypost production coordinator: The Post Republic
- Gregor Pfüllercolourist: The Post Republic
- Eleanor Downeylocation assistant
- Duncan Flowerlocations manager
- Philip Lobbanlocation scout
- Becky Benthamscore coordinator
- Joe Bowman-Coleperformer
- Andy Brownorchestra contractor
- Andrew Dudmanmusic mixer
- Lol Hammondmusic supervisor
- Rael Jonesguitars: and additional music
- Laurence Love Greedprogramming: and score production
- Rita Manningorchestra leader
- Dave Jewerén Mooremusic recordist (as Dave Moore)
- Lloyd Perrinoriginal music by
- Carole Salisburyscript supervisor
- Symon Butcherunit driver
- Andy Dixonfacility vehicles: provider
- Erol Halilunit driver
- Chris Johnfacilities driver
- David O'Donoghuedriver: Anjelica Huston
- Jason Rushfacilities driver
- Richard Watkinsfacilities captain: and driver
- Chidozie C. Ahaiwep.r. and marketing
- Dare Aiyegbayodevelopment assistant: Vertigo Films
- Hilary Audusanimation director: for Novel Entertainment
- Laura Baileychaperone
- Stewart Barnesfor: Guilt Free Productions
- Jaclyn Bashoffassistant: to Ms Huston
- Janet Baumforthfor: Blueprint PR
- Wahida Begumhead of public relations: and marketing
- Angelica Bolognesi Bonacinivoice actress: Scarlett Stitt
- Milvia Bonacinivoice actress: Parminder Nagra
- James AlexanderNovel Entertainment would like to thank
- Trevor Annettspecial thanks
- David Bevanspecial thanks
- Annabel BodenNovel Entertainment would like to thank
- Matthew Bowenthe filmmakers would also like to thank
- James Brownspecial thanks
- Gordon Campbellspecial thanks
- Laetitia Chiklythe costume department would like to thank
- John Coverdalespecial thanks
- Alan Crossspecial thanks
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