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The Constitution of the United Kingdom or British constitution comprises the written and unwritten arrangements that establish the United Kingdom of Great Britain and Northern Ireland as a political body. Unlike in most countries, no attempt has been made to codify such arrangements into a single document.
The UK is often said to have an 'unwritten' constitution. ... The UK has never experienced such a constitutional moment: it has not been defeated in war since 1066, and has had only one revolution, in the 17th century (which did produce a short lived written constitution, Cromwell's Instrument of Government).