What becomes of our Coast in winter, its 'secret season', when we're at home? Nick Crane visits the storm capital of our shores, Cornwall, where he explores the worst lifeboat disaster of the last 60 years. Nick also discovers how wild winter seas bring surprising benefits to Cornish farmers growing cauliflowers and potatoes, and to the oyster fishermen of the Fal Estuary. Neil Oliver experiences the extraordinary Viking Fire Festival on Shetland our most northerly isles. Is their spectacular ritual of burning a Viking Longship as authentic as it appears? On the wild western Isles of St Kilda a feral flock of sheep untouched for thousands of years battle to the death as winter approaches, and Andy Torbet throws himself into the fray.