Iain Robertson embarks on a 215-mile coast-to-coast challenge of walking the Southern Upland Way, from Portpatrick on the west coast to Cockburnspath on the east coast.

With 71 miles left of his journey along the Southern Upland Way, Iain Robertson is joined by photographer Elaine Livingston and River City co-star Grant Stott on the last leg of his 215-mile walk.