Clare Balding takes a walk along the banks of the Severn in the company of the country's most prolific travel writers, Christopher Somerville who's also the walking correspondent of The Times. They begin their six and a half mile walk in the Gloucestershire village of Purton which lies on the east bank of the River Severn, Christopher's childhood village of Leigh is not far upstream. He talks to Clare about the role walking has played in his life and how it became a way that he could reconnect with his late father.

The route can be found on OS Explorer OL 14 , map ref for the starting point : SO 684021

Producer Lucy Lunt.