The United Kingdom is a unitary democracy governed within the framework of a constitutional monarchy, in which the Monarch is the head of state and the Prime Minister of the United Kingdom is the head of government. Executive power is exercised by Her Majesty's Government, on behalf of and by the consent of the Monarch, as well as by the devolved Governments of Scotland and Wales, and the Northern Ireland Executive. Legislative power is vested in the two chambers of the Parliament of the United Kingdom, the House of Commons and the House of Lords, as well as in the Scottish parliament and Welsh and Northern Ireland assemblies. The judiciary is independent of the executive and the legislature. The highest court is the Supreme Court of the United Kingdom.