Prime Minister of the United Kingdom

The Prime Minister of the United Kingdom of Great Britain and Northern Ireland is the political leader of the United Kingdom and the Head of His/Her Majesty's Government. The Prime Minister and Cabinet (consisting of all the most senior ministers, who are government department heads) are collectively accountable for their policies and actions to the Sovereign, to Parliament, to their political party or parties, and ultimately to the electorate. The office of the prime minister is the highest political office in the modern United Kingdom, except for the office of King/Queen itself.

The office was not "created" or "established", but rather has evolved into existence over a period of three centuries, with various unwritten rules, customs, and laws hardening into the current office.