This is the first scholarly survey of the British constitution in the twentieth century. Indeed, it fills a very real gap in the history of Britain during the last hundred years. The book is a product of interdisciplinary collaboration by a distinguished group of constitutional lawyers, historians and political scientists, and draws where possible on primary sources. Its evaluation of the recent constitutional reforms will be of particular interest. This major interpretation of the constitution will remain authoritative for many years. It is essential reading for all those seeking to understand the impact of the constitutional reforms of recent years.