Having first been summoned by Winston Churchill for polling advice when he was only twenty-five, David Butler got to know most of Britain’s senior post-war politicians and has acted as a highly influential voice behind the scenes. In 1945 he was the first to turn British constituency results into percentages, and thereby founded the science of psephology. Later he invented the BBC’s popular Swingometer, which is still used today. Since then, Butler, now aged 94, has shown everyone not just how to analyse elections, but how to make sense of our democracy. It is a great honour for Chalke Valley History Festival that Sir David Butler will discuss remarkable life as the greatest analyst of British elections with award-winning TV correspondent Michael Crick. This promises to be both fascinating and timely.