Book excerpt: Interrogation, Intelligence and Security examines the origins and effects of a group of interrogation techniques known as the ‘five techniques’. Through its in-depth analysis the book reveals how British forces came to use these controversial methods. Focusing on the British colony of Aden (1963–67), the height of ‘the troubles’ in Northern Ireland (1971), and the conflict in Iraq (2003), the book explores the use of hooding to restrict vision, white noise, stress positions, limited sleep and a limited diet. There are clear parallels between these three case studies and the use of controversial interrogation techniques today. Readers will be able to make informed judgements about whether, on the basis of the results of these cases, interrogation techniques that might be described as torture can be justified. This book will be of particular interest to security professionals, academics and members of the public interested in the torture debate, intelligence, the military, counter-insurgency, counter-terrorism, foreign policy and law enforcement.