Amazing Spaces Shed of the Year

George Clarke discovers what is really happening in the Great British shed with the Shed of the Year competition - from an intricate shell grotto inside a war bunker to a disco shed that plays the biggest festivals in the country. There's also a Dad's Army enthusiast who's built an entire museum full of memorabilia and a man who's converted his shed into a 1970s amusement arcade. George travels the length and breadth of the British Isles with his Amazing Spaces team of master craftsman Will Har…