Government institutions in United Kingdom, including legislatures, judicial bodies, and executive agencies.
Elected lower house of the UK Parliament. It is the central chamber for legislation, scrutiny, confidence votes, and government formation.
Unelected upper house of the UK Parliament. It revises legislation, scrutinizes government, and includes life peers, bishops, and a small number of hereditary peers.

supreme legislative body of the United Kingdom
Highest court in the United Kingdom. It hears appeals on points of law of the greatest public and constitutional importance and is institutionally separate from Parliament.
Bicameral legislature of the United Kingdom, consisting of the House of Commons and the House of Lords.