This book is a fully up-to-date, comprehensive guide to the law, economics and practice of UK merger control law. This guide presents an integrated legal and economic assessment of the substantive appraisal of mergers and examines in detail the following topics: the history of the Enterprise Act and its development from the Fair Trading Act; the various regulatory bodies that form the institutional structure of the UK merger control regime; enterprises subject to merger control regulation and the jurisdictional thresholds of the Enterprise Act; the relationship of the Enterprise Act with the European Merger Regulation; public interest mergers and the role of the Secretary of State; and merger remedies. All recent legislative developments including the merger of the OFT and the Competition Commission and the Enterprise and Regulatory Reform Act 2013, as well as all relevant case since the first edition of the magisterial text are explored.