Coast is back in the UK and, for the first time, each episode will feature stories from every part of the British Isles, taking viewers on a 'journey of the imagination' which explores the universal themes that bind everyone together. Nick Crane signs on as a deck-hand with a tall ship, reliving the great days of sail on a gruelling yet exhilarating journey between the Northern Isles of Scotland. Nick hopes to fulfil a childhood ambition by setting foot on tiny 'Fair Isle'. This is the most remote populated outpost in the British Isles and home to just 70 hardy souls. Can Nick uncover the mystery of how this tiny community's struggle to survive was successful, when many other larger Scottish islands were abandoned? At Scapa Flow on Orkney, Neil Oliver explores the conspiracy theories surrounding the mysterious death of Lord Kitchener. Kitchener was one of over 600 soldiers and sailors who perished when their ship went down. Neil meets locals on Orkney who believe tales of suspicious events on the fateful night of the wreck. Historian Tessa Dunlop hopes to witness an extraordinary and uplifting sight that is special to the Western Isles of Scotland: the mysterious Green Ray. What causes the exceptionally rare Green Ray and how can Tessa be guaranteed to see it? On the Isle of Wight Coast newcomer Andy Torbet finds himself scaling slippery new heights on the Needles. There are no records of his climb being done before. He is attempting the perilous ascent to solve the mystery of why this needle of chalk has resisted erosion by the waves for millions of years. There is a special appearance by legendary folk singer June Tabor who tells the tale of the mysterious Selkie, a mythical creature that can take the shape of man or a seal.

• Alice Roberts
• Miranda Krestovnikoff