Her Majestys Government, commonly referred to as the UK government or British government, is the central government of the United Kingdom of Great Britain and Northern Ireland. The government is led by the Prime Minister, who all the remaining ministers. The prime minister and the other most senior ministers belong to the supreme decision-making committee, the government ministers all sit in Parliament, and are accountable to it. After an election, the monarch selects as prime minister the leader of the party most likely to command a majority of MPs in the House of Commons. Under the uncodified British constitution, executive authority lies with the monarch, although this authority is exercised only by, or on the advice of, the prime minister, the Cabinet members advise the monarch as members of the Privy Council. They also exercise power directly as leaders of the Government Departments, the current prime minister is Theresa May, who took office on 13 July 2016. She is the leader of the Conservative Party, which won a majority of seats in the House of Commons in the election on 7 May 2015. Prior to this, Cameron and the Conservatives led a government from 2010 to 2015 with the Liberal Democrats. A key principle of the British Constitution is that the government is responsible to Parliament, Britain is a constitutional monarchy in which the reigning monarch does not make any open political decisions. All political decisions are taken by the government and Parliament and this constitutional state of affairs is the result of a long history of constraining and reducing the political power of the monarch, beginning with the Magna Carta in 1215. Parliament is split into two houses, the House of Lords and the House of Commons, the House of Commons is the lower house and is the more powerful. The House of Lords is the house and although it can vote to amend proposed laws. Parliamentary time is essential for bills to be passed into law, Ministers of the Crown are responsible to the House in which they sit, they make statements in that House and take questions from members of that House. For most senior ministers this is usually the elected House of Commons rather than the House of Lords, since the start of Edward VIIs reign, in 1901, the prime minister has always been an elected member of Parliament and therefore directly accountable to the House of Commons. Under the British system the government is required by convention and for reasons to maintain the confidence of the House of Commons. It requires the support of the House of Commons for the maintenance of supply, by convention if a government loses the confidence of the House of Commons it must either resign or a General Election is held. The support of the Lords, while useful to the government in getting its legislation passed without delay, is not vital, a government is not required to resign even if it loses the confidence of the Lords and is defeated in key votes in that House. The House of Commons is thus the Responsible house, the prime minister is held to account during Prime Ministers Question Time which provides an opportunity for MPs from all parties to question the PM on any subject
Main entrance of 10 Downing Street, the residence and offices of the First Lord of HM Treasury
Refurbishment notice at Old Fire Station, Oxford, showing HM Government support.