(This book) is both a fascinating and frightening history of how many good and able people struggled with exceptional risk and the most demanding and highly complex intellectual and practical issues to prevent Armageddon. How close was it?'At long last Twigge and Scott have taken a major step towards meeting the requirement for a comprehensive history and analysis of British nuclear weapons operations in the Cold War era...Using rigorous scholarship, access to recently released documents, and interviews with some of those involved in the key decisions, Twigge and Scott have put together a richly textured and detailed study of Britain's early attempts to manage and operate its nuclear weapons.'