Gavin Boyter, a Scottish filmmaker and amateur runner in his mid-40s, frustrated by a life of stagnation, conceives an audacious plan: to run the length of Britain and document the journey on film. He begins at John O’Groats, battling swollen ankles, brutal Highland weather, and harrowing navigation hazards. Early decisions, like hopping on a bike to make up time, hint at the physical toll to come. As the miles progress, the terrain ranges from rugged Scottish mountains to English B-roads thronged with lethal traffic. Boyter survives near catastrophes: icy river crossings, devastating equipment theft, car crashes, and the near-loss of his crew. His wry narration and vivid cinematography humanise the epic, weaving humour and humility through weeks of pure exhaustion. Along the way he connects with locals, fellow runners, and devoted support staff. As he nears Land’s End, fatigue peaks, but so does adrenaline. Met by his ever-supportive parents, Boyter crosses the finish line, completing an epic, chaotic, journey of self rediscovery. His parting reflections cast the run as metaphor: endurance as transformation; miles as measures of one’s true limits.