Clare Balding walks part of the Elan Valley pipeline: 73 miles of Victorian engineering running water from mid Wales into the city of Birmingham. Clare is walking with artist Kate Green who has spent the summer walking the pipe and getting to know people and places along the way. They're walking a stretch that runs around the town of Ludlow in the Welsh Marches. Joining them are Andy Holman who runs a horse rescue centre on his land which holds part of the pipelines, and Tim Hipkiss part of a group of walkers called the Laura Ashley Pate Spreaders who she encountered as they were walking the pipeline too.

Producer: Maggie Ayre