At dusk on 24 September 1975, Doug Scott and Dougal Haston became the first Britons to reach the summit of Everest as lead climbers on Chris Bonington's epic expedition to the mountain's immense south-west face.As darkness fell, Scott and Haston scraped a small cave in the snow 100 metres below the summit and survived the highest bivouac ever - without bottled oxygen, sleeping bags and, as it turned out, frostbite. For Doug Scott, it was the fulfilment of a fortune-teller's prophecy given to his mother: that her eldest son would be in danger in a high place with the whole world watching.Scott...