The constitution of the United Kingdom of Great Britain and Northern Ireland is the sum of laws and principles that make up the body politic of the United Kingdom. It concerns both the relationship between the individual and the state, and the functioning of the legislature, the executive and judiciary. Unlike many other nations, the UK has no single constitutional document. This is sometimes expressed by stating that it has an uncodified or "unwritten" constitution. Much of the British constitution is embodied in written documents, within statutes, court judgments, works of authority and treaties. The constitution has other unwritten sources, including parliamentary constitutional conventions.