Ramblings: Arsenic and Fish Weirs on the Edge of Dartmoor

Clare Balding explores the Lower Tavy Valley in Devon with Sharon Gedye, a physical geographer who has spent years discovering how the area's rich history has shaped its landscape and people, as well as archeologist Chris Smart and heritage consultant Andrew Thompson. Along the way the group see evidence of arsenic mines, copper workings and discuss long-forgotten but fascinating fish weirs