Amit Gupta Director, Screenwriter Michael Sheen Tommy Atkins Actor Iwan Rheon George Actor Kimberley Nixon Bethan Actor Andrea Riseborough Sarah Actor Stanislav Ianevski Bernhardt Actor Tom Wlaschiha Albrecht Actor Anatole Taubman Sebald Actor Alexander Doetsch Steiner Actor Sharon Morgan Maggie Actor Mossie Smith Ruth Actor George Taylor Gernot Actor Tomos Eames Tom Lewis Actor Nia Gwynne Sian Actor Owen Sheers Screenwriter Keith Potter Executive Producer Richard J. Staniforth Executive Producer Amanda Faber Producer Richard Holmes Producer Mark Bradshaw Original Music John Pardue Cinematographer Chris Barwell Film Editing Sam Jones Casting Adrian Smith Production Design Michael Fleischer Art Director Rosanna Westwood Art Director Nigel Egerton Costume Design