Last summer comedian Eddie Izzard completed 43 marathons in 51 days around the UK in aid of Sport Relief. This programme finds out how he managed to finish the gruelling endurance challenge after just five weeks of training. In the first episode, Eddie sets off from London and begins to struggle against severe weather and an unforgiving terrain. He makes a moving return to his old house in Skewen, South Wales, and faces an epic climb into the Brecon Beacons