Many years ago, Grandpa was a World War II flying ace, but sadly he is now suffering from Alzheimer's disease. When his family can no longer look after him, he is moved to Twilight Towers, an old people's home. It soon becomes clear that Miss Dandy is running Twilight Towers for her own ulterior motives, and it is up to Grandpa and grandson Jack to make a daring escape. Failure could have the direst of consequences, but success will give Grandpa a final chance to relive his past and take to the sky once again in his beloved Spitfire.
Unfortunately the movie Grandpa's Great Escape is not yet available on HBO Max.
| Writing | David Walliams | Writer |
| Writing | Kevin Cecil | Adaptation |
| Directing | Elliot Hegarty | Director |
| Writing | David Walliams | Original Story |
| Costume & Make-Up | Chris Lyons | Special Effects Makeup Artist |
| Sound | Gwilym Perry | Foley Editor |
| Camera | Martin Newstead | Steadicam Operator |
| Lighting | Conor Mackenzie | Lighting Technician |
| Production | Francesca Falchi-Pereira | Production Coordinator |
| Sound | Matt Biffa | Music Supervisor |
| Art | Suzanne Field | Art Direction |
| Costume & Make-Up | Jacqui Mallett | Makeup Department Head |
| Art | Iain McDonald | Production Design |
| Costume & Make-Up | Jacqui Mallett | Makeup Designer |
| Editing | Peter Oliver | Editor |
| Costume & Make-Up | Julie Dorrat-Keenan | Makeup Supervisor |
| Visual Effects | Tim Zaccheo | Visual Effects Supervisor |
| Editing | Amy Swan | Assistant Editor |
| Directing | Lucy Enfield | Script Supervisor |
| Camera | Richard Mott | Director of Photography |
| Camera | Alan Maxwell | Camera Operator |
| Lighting | Dave Thom | Gaffer |
| Costume & Make-Up | Cathy Prior | Costume Supervisor |
| Crew | Chris Pollard | Stunts |
| Crew | Karie-Ann Robinson | Chaperone |
| Crew | Andy Merchant | Stunts |
