Prime Minister of the United Kingdom the incumbent is consistently ranked as one of the most powerful and influential people in the world. The Prime Minister is the head of the United Kingdom government. As such, the modern Prime Minister leads the Cabinet (the Executive). In addition, the Prime Minister leads a major political party and generally commands a majority in the House of Commons (the lower House of the legislature). The incumbent wields both significant legislative and executive powers. Under the British system, there is a unity of powers rather than separation. In the House of Commons, the Prime Minister guides the law-making process with
Deputy Prime Minister of the United Kingdom of Deputy Prime Minister may provide additional practical status within the cabinet, enabling exercise of "de facto", if not "de jure", power. In a coalition government, such as the 2010–2015 coalition government between the Conservatives and Liberal Democrats, the appointment of the leader of the smaller party (in the 2010 case, Nick Clegg, leader of the Liberal Democrats) as Deputy Prime Minister is done to give that person more authority within the cabinet to enforce the coalition's agreed-upon agenda. The Deputy Prime Minister usually deputises for the Prime Minister at official functions, such as Prime Minister's Questions. Many theories exist