This text reveals the full extent of Britain's preparations for nuclear war during the Cold War. When would the Prime Minister have authorised the use of nuclear force? At what stage in a nuclear exchange would government and the country have broken down? Who would have gone with the PM and the War Cabinet and where was the immensely secret underground bunker that they would have gone to? What would the Queen have been told, and when, about the end of her kingdom? Peter Hennessy answers these questions in an accessible style.