The explorer digs out his rucksack and heads for Windermere in the Lake District. The National Park attracts 18 million visitors each year, and is now a World Heritage site. Here, Paul finds out why the early tourists thought the Lakes was one of the most dangerous spots in the country. He also plunges into the world of long-distance swimming and helps the staff who run the boats on the lake and meets a Holocaust survivor who was airlifted to Windermere in 1945 as part of a mercy mission involving 300 orphans after the Second World War