Episode 4

Embarking on the last leg of his 200-mile challenge, Iain and Molly head off from Clisham Hill on Harris.

Passing Loch Seaforth, Iain is jubilant about the milestone of reaching his tenth island. Reaching Baile Ailen, Iain and Molly are buoyed by the sight of some local deer.

Heading on towards Achamore, Iain and Molly find themselves on marshy terrain. However, Iain is upbeat in the knowledge that the next day will see him reach the walk's official end in Stornoway. On the nine-mile journey to Stornoway, Iain is joined by actor Kevin McKidd, and the pair discuss their heritage and their respective connection to the land.

Celebrating reaching the walk's official end in Stornoway, at Lewes Castle, they are pleased to be shown the Lewis chessmen by archivist Seonaid McDonald. Iain suggests that this would be a great place to finish the official walk, but he plans to extend the walk on to the Butt of Lewis.

However, there is one last detour as Iain joins up with with actor Alex Norton, with the pair planning to cycle across to see the Callanish Standing Stones, which are around 5,000 years old and predate even Stonehenge. A natural raconteur, Alex regales Iain with stories about his days with 7:84 and his time in Taggart.

170 miles into the walk, Iain heads towards New Tolsta and gets chatting to retired local Hector Morrison about growing his own produce. Despite covering 16 miles, Iain pushes on to Traigh Mhòr Beach, crossing one of Lord Leverhulme's industrial bridges on the final stage of his journey.