David Nicholls 
Pluralist State [PDF ebook] 
The Political Ideas of J.N. Figgis and his Contemporaries

This book presents a critical account of the political pluralism of Figgis, Laski and other English writers of the early twentieth century, indicating its whig roots in the previous century. Pluralists believed in liberty, preserved by power decentralised, and in group personality. Theories of sovereignty were rejected and a distinctive understanding of the state proposed. Pluralism is particularly relevant to a world where the omnicompetent state has increasingly been called into question and federal structures of authority are the order of the day.