An unusual urban walk to finish the series: Clare Balding is in London on the Isle of Dogs for a ramble along the banks of the River Thames. It's not a true island, rather it's enclosed on three sides by the river, and has a rich and fascinating history.

Clare is joined by Sarah Wynne, her sister and a friend. Sarah moved to the Isle of Dogs when she was six and grew up there. People are intrigued when she tells them this, they want to know what her childhood entailed: did she ever play outside, or go to the countryside, how did she get to school?

For Sarah, walking gives her a breathing space in fast-paced London life. She often walks with only a vague idea of where she is going, and likes to see where she'll end up. She finds it empowering to simply follow her instincts about which direction to take.

Producer: Karen Gregor.