Modern sources of legislation

Acts of the United Kingdom Parliament
Statutory instruments (for example, orders or regulations) made by a Minister or by the Queen-in-Council, generally subject either to parliamentary approval (affirmative procedure) or parliamentary disallowance; these are made either under Acts or by the royal prerogative. Parliament of the United Kingdom

Acts of the devolved Scottish Parliament, and statutory instruments made by the Scottish Executive (likewise subject to approval or disallowance by the Scottish Parliament) Scottish Parliament

Statutory instruments made by the National Assembly for Wales National Assembly for Wales

Acts of the Northern Ireland Assembly, and statutory instruments made by Northern Ireland Departments European Union

Parliament of England (13th century - 1707)
Parliament of Scotland (13th century - 1707)
Parliament of Ireland (13th century - 1800)
Parliament of Great Britain (1707 - 1800)
Parliament of Northern Ireland (1921 - 1972)