This is the first work to disentangle the procedural complexities of the interplay between public and private enforcement of competition law in the EU and in the UK as well as in its transnational, multi-jurisdictional dimension. Now in its second edition, the work considers a number of crucially important legal developments in relation to the enforcement of competition law globally and within the European Union including the EU Directive on damages actions, the reforms of the UK public enforcement regime in the Enterprise and Regulatory Reform Act 2013, the reforms of the UK private enforcement regime brought about by the Consumer Rights Act 2015, and recent case law developments on public and private enforcement. This volume contains an in-depth examination of the principles and policies underlying the interplay of administrative, criminal and civil proceedings and explains in detail the practical solutions and strategies available in light of the relevant legislation and case law. Fully revised and updated with developments in jurisprudence across the US, UK, and EU, this is the most comprehensive and authoritative practitioner guide to this fast-moving and complex area of law.