European law has come to influence almost all fields of national law, including administrative, constitutional, contract, criminal and even tort law. But what is the European Union? How does it work? How does it produce European law? This book uses a clear framework to guide readers through all core constitutional and substantive topics of EU law. New content includes: a Brexit chapter covering the negotiation process and the possible future relationships between the United Kingdom and the European Union, new EU private international law and EU criminal law sections, extended coverage of delegated legislation, human rights and free movement of persons. All chapters reflect judicial and legislative practice up to 31st December 2017. Key features: case extracts accompanied by extensive critical discussion of the theoretical and practical aspects of EU law, over 100 figures and tables clarifying complex topics and a companion website with full 'Lisbonised' versions of cited cases and many extra materials.