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The Bafta-winning Coast journeys around the British Isles and beyond to see how shared seas unite us all.

Britain's strong bonds with its Celtic cousins across the English Channel in Brittany, or 'Little Britain' as the French think of it, are explored, as the programme visits brand new territory.

Neil Oliver tours the province of Finistere, 'The End of the Earth', which is battered by some of the wildest waters in the world. He also sees how Breton writer Jules Verne's novel 20,000 Leagues Under the Sea took on a terrifying reality with Hitler's U-boat base in L'Orient.

Alice Roberts reveals the life-saving chemical element that's locked away inside seaweed as she recreates the remarkable accidental discovery of iodine. At Carnac, Mark Horton moves among the mysterious lines of standing stones erected thousands of years before Stonehenge to investigate their age-old connection to Britain.

British sailor Sam Davies talks about living and training in Brittany for a round-the-world yacht race, the Vendee Globe, while Neil harvests sea salt using an age-old technique in Guerand, south Brittany.