Overview
- Principal photography is underway on Anglesey, with shooting having begun in late June, as reported by Variety, Empire and News18.
- Peter Mullan is cast as Bill, a reclusive mountain dweller, and newcomer Seth Isaac Thomas will play GG, the neglected boy at the story’s center.
- Rebecca Lucy Taylor is expected to make her cinematic lead debut as GG’s mother, while Iwan Rheon’s specific role has not yet been revealed.
- Celyn Jones directs from a screenplay co-written with Lisa Baker and the production is led by Mad As Bird Films with producers Nadia Jaynes, Sean Marley and Rachel Richardson‑Jones.
- Bill Ryder Jones is composing the soundtrack and casting is by Ollie Gilbert and Katy Covell, with coverage positioning Mountain as part of a growing Welsh New Wave in cinema.