Coast embarks on an island-hopping adventure in Scotland, around the stunning Western Isles and out to the northern outpost of Shetland. Nick Crane visits the close-knit communities of the island of Eriskay, and on Lewis meets the leader of the Guga Hunters, a small band of men continuing a tradition of catching young gannets which perch precariously on sea cliffs. Neil Oliver explores the shipwreck of the Iolaire which went down on New Year's Eve 1918, costing the lives of over 200 returning First World War servicemen. On Staffa, Hermione Cockburn learns how a visit to Fingal's Cave inspired Felix Mendelssohn to compose his Hebrides Overture, while Miranda Krestovnikoff ventures to the tiny Isle of Noss to see the remains of a remarkable project to breed a super-strong Shetland pony.