The modern-day UK intelligence and security community is the product of over a century of reviews going back to Edwardian spy scares, through two World Wars, and a Cold War. Written by intelligence experts, Intelligence, Security and the State provides an insight into the development of UK intelligence through a selection of the many intelligence reviews that have taken place during this period. How and why these reviews were commissioned and their impact, if any, is analysed in detail. The reviews cover the origins and early development of the community, alongside the political, operational, and financial oversight of British intelligence. Each of the declassified reviews, reproduced here for the first time, are introduced by short essays giving a wider understanding of the UK intelligence community. The book offers a detailed insight into the machinery of government in the UK and British intelligence as a whole.