Crickhowell and Bala

Derek Brockway tries out barefoot walking in the hills above Crickhowell with Lynne Allbutt - the first person to run barefoot across Wales. And following that theme, he walks around Lake Tegid at Bala - the biggest lake in Wales - partly on the route of Mari Jones, who back in 1800, walked 25 miles barefoot to buy a copy of the Bible in Welsh.