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Tom Courtenay as Grandpa |
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Kit Connor as Jack |
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Jennifer Saunders as Miss Dandy |
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David Walliams as Barry |
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Samantha Spiro as Patricia |
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Alice Nokes as Shelley |
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Frankie Fox as Dazza |
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Michele Dotrice as Miss Trifle |
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Katy Brand as Miss Verity |
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Harish Patel as Raj |
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Ralph Riach as Mr. Willkins |
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Rafe Spall as Adult Jack (voice) |
| Writing | Kevin Cecil | Adaptation |
| Writing | David Walliams | Writer |
| Directing | Elliot Hegarty | Director |
| Writing | David Walliams | Original Story |
| Costume & Make-Up | Chris Lyons | Special Effects Makeup Artist |
| Editing | Peter Oliver | Editor |
| Camera | Richard Mott | Director of Photography |
| Art | Iain McDonald | Production Design |
| Art | Suzanne Field | Art Direction |
| Costume & Make-Up | Julie Dorrat-Keenan | Makeup Supervisor |
| Costume & Make-Up | Jacqui Mallett | Makeup Department Head |
| Costume & Make-Up | Jacqui Mallett | Makeup Designer |
| Sound | Gwilym Perry | Foley Editor |
| Visual Effects | Tim Zaccheo | Visual Effects Supervisor |
| Camera | Alan Maxwell | Camera Operator |
| Camera | Martin Newstead | Steadicam Operator |
| Lighting | Dave Thom | Gaffer |
| Lighting | Conor Mackenzie | Lighting Technician |
| Costume & Make-Up | Cathy Prior | Costume Supervisor |
| Editing | Amy Swan | Assistant Editor |
| Sound | Matt Biffa | Music Supervisor |
| Directing | Lucy Enfield | Script Supervisor |
| Production | Francesca Falchi-Pereira | Production Coordinator |
| Crew | Karie-Ann Robinson | Chaperone |
| Crew | Andy Merchant | Stunts |
| Crew | Chris Pollard | Stunts |
