Michael Crick tells the extraordinary story of the man who put the swing into British politics. Sir David Butler pioneered the science of elections, bringing the voting figures to life on national television. An Oxford boffin who has publicly analysed every British general election since the war, Butler has done more than anyone to transform TV coverage of British elections. As a twenty-year-old student in 1945, Butler was the first to turn election results into percentages, and hence a science. And seventy-two years later, the academic known as the 'father of psephology' was using...