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Having cycled an incredible 16,000 miles across six continents in 116 days, endurance adventurer Sean Conway decided to take on a new challenge: becoming the first to swim the length of Britain. He explains how he did it – despite close encounters with jellyfish, 3am starts and freezing temperatures – and gives his tips on how to endurance-swim safely and effectively• Additional footage courtesy of Owain Wyn-Jones (@OwynJones)