Engineering enthusiast Guy Martin and the team repair the water turbine needed to power an old saw mill in Wensleydale, North Yorkshire. He then ropes in a carpenter friend to help fell a tree and transport it to the building on a steam traction engine, before using the cut wood to make a replica of the first pedal-powered bicycle. Along the way, Guy learns about the lives of factory workers during the Industrial Revolution and how child apprentices were often little more than slave labour