The law relating to general defences is one of the most important areas in the criminal law, yet the current state of the law in the United Kingdom reveals significant problems in the adoption of a consistent approach to their doctrinal and theoretical underpinnings, as exemplified by a number of recent developments in legislation and case law. A coherent and joined-up approach is still missing. This volume provides an analysis of the main contentious areas in British law, and proposes ways forward for reform. The collection includes contributions from leading experts across various jurisdictions. Part I examines the law in the United Kingdom, with specialist contributions on Irish and Scottish law. Part II consists of contributions by authors from a number of foreign jurisdictions, all written to a common research grid for maximum comparability, which provide a wider background of how other legal systems treat problems relating to general defences in the context of the criminal law, and which may serve as points of reference for domestic law reform.