The British constitution is not contained in a single written document. It is instead an uncodified constitution, which means it is made up of multiple sources, including:
Statute law: Acts of Parliament, such as the Magna Carta and the Human Rights Act 1998.
Common law: Legal principles developed through judicial decisions.
Constitutional conventions: Unwritten practices that guide political conduct, such as the role of the Prime Minister.
Works of authority: Documents like Erskine May’s Parliamentary Practice, which explain constitutional principles.
Treaties: International agreements, such as the European Convention on Human Rights.
This flexibility allows the constitution to evolve over time, but it also makes it distinct from codified constitutions like that of the United States.