This work investigates the underlying principles and structural logic that define the uncodified constitution of the United Kingdom. Nicholas William Barber, a professor of constitutional law and theory, utilizes a framework of legal philosophy to explain how the UK's disparate laws, conventions, and practices function as a coherent system. He argues that the constitution is not merely a collection of historical accidents but a deliberate arrangement of power designed to balance parliamentary sovereignty with the rule of law.

Legal scholars and students frequently cite this text for its clarity in navigating the complexities of the British constitutional order. Experts highlight the book as a rigorous academic resource that successfully synthesizes abstract legal theory with practical governance.