The purpose of this book is to introduce the reader to the fundamental principles and concepts of constitutional and administrative law. It is highly popular with undergraduates for its clear writing style and the ease with which it guides the reader through key principles of public law. This thirteenth edition incorporates the significant developments in this ever-changing area of the law. The book also includes a range of useful features to help students get to grips with the subject matter. These include further reading suggestions to support deeper research, a large number of self-test questions to help reinforce knowledge, and chapter summaries and numbered paragraphs to aid navigation and revision. This new edition has been fully updated to cover all the latest reforms in constitutional and administrative law, including those relating to devolution and the policing of public protests.