In United Kingdom monarch is the head of state and the Prime Minister is the head of the government. Executive power is implemented by Her Majesty’s Government, on behalf of the Monarch, as well as by the developed governments of Scotland and Wales.
Monarchy
The head of state and theoretical source of executive, judicial and legislative power in the UK is the British monarch, currently Queen Elizabeth II. However, sovereignty in the UK no longer rests with the monarch, since the English Bill of Rights in 1689, which established the principle of Parliamentary Sovereignity. Despite this the Monarch remains Head of State, akin to a President in European (but not American) political tradition.
Queen Elizabeth II & Today the Sovereign has an essentially ceremonial role restricted in exercise of power by convention and public opinion. However the monarch does continue to exercise three essential rights: the right to be consulted, the right to advise and the right to warn. Prime ministers have weekly confidential meetings with the monarch.
Originally the monarch possessed the right to choose any British citizen to be her Prime Minister and could call and dissolve Parliament whenever he or she wished. However, in accordance with the current 'unwritten constitution', the Prime Minister is the leader of the largest party in the House of Commons and Parliament is dissolved at the time suggested by him or her. The monarch retains the ability to deny giving a bill Royal Assent, although in modern times this becomes increasingly more unlikely, as it would cause a constitutional crisis. Queen Anne was the last monarch to exercise this power, which she did on 11 March 1708 with regard to a bill "for the settling of Militia in Scotland". Other royal powers called royal prerogative, such as patronage to appoint ministers and the ability to declare war, are exercised by the Prime Minister and the Cabinet, with the formal consent of the