First Lord of the Treasury in the context of "Prime minister of the United Kingdom"

The prime minister of the United Kingdom is the head of government of the United Kingdom. The prime minister advises the sovereign on the exercise of much of the royal prerogative, chairs the Cabinet, and selects its ministers. Modern prime ministers hold office by virtue of their ability to command the confidence of the House of Commons, so they are invariably members of Parliament.

The office of prime minister is not established by any statute or constitutional document, but exists only by long-established convention, whereby the monarch appoints as prime minister the person most likely to command the confidence of the House of Commons. In practice, this is the leader of the political party that holds the largest number of seats in the Commons. The prime minister is ex officio also First Lord of the Treasury (an office often associated with the premiership between 1721 and 1895, after 1902 always united to it, and, after 1905, an official title of the position), Minister for the Civil Service, the minister responsible for national security, and Minister for the Union. The prime minister's official residence and office is 10 Downing Street in London.

10 Downing Street in London is the official residence and office of the First Lord of the Treasury, an office held concurrently by the prime minister of the United Kingdom. Colloquially known as Number 10, the building is located in Downing Street, off Whitehall in the City of Westminster.

It is over 300 years old, is a Grade I listed building, and contains approximately 100 rooms. A private residence for the prime minister occupies the third floor and there is a kitchen in the basement. The other floors contain offices and conference, reception, sitting and dining rooms where the prime minister works, and where government ministers, national leaders, and foreign dignitaries are met and hosted. At the rear is an interior courtyard and a terrace overlooking a 1⁄2-acre (0.2 ha) garden. Number 10 is adjacent to St James's Park, approximately 3⁄4 mile (1.2 km) from Buckingham Palace, the official residence of the British monarch in London, and is near the Palace of Westminster, the meeting place of both Houses of Parliament.

David Cameron's tenure as Prime Minister of the United Kingdom began on 11 May 2010 when he accepted an invitation of Queen Elizabeth II to form a government, succeeding Gordon Brown of the Labour Party, and ended on 13 July 2016 upon his resignation following the 2016 referendum that favoured Brexit, which he had opposed. As prime minister, Cameron also served simultaneously as First Lord of the Treasury, Minister for the Civil Service, and Leader of the Conservative Party.

Following the 2010 general election, Cameron became prime minister at the head of a coalition government between the Conservatives and Liberal Democrats, as no party had gained an overall majority in the House of Commons for the first time since the February 1974 general election. He appointed Nick Clegg, Leader of the Liberal Democrats, Deputy Prime Minister. Between them, the Conservatives and Liberal Democrats controlled 363 seats in the House of Commons, with a majority of 76 seats.

James Waldegrave, 2nd Earl Waldegrave, KG, PC, FRS (4 March 1715 – 13 April 1763) was a British politician who is sometimes regarded as one of the shortest-serving prime ministers in British history. His brief tenure as First Lord of the Treasury is lent a more lasting significance by his memoirs, which are regarded as significant in the development of Whig history.

Waldegrave served as a governor to The Prince of Wales (the future George III) and Prince Edward from 1752 to 1756. After the resignation of the Duke of Newcastle as prime minister and the dismissal from office of the influential minister William Pitt, George II invited Waldegrave to take over the position of the First Lord of the Treasury. Waldegrave tried to form a government from 8 to 12 June 1757, but failed to do so and stepped down

Sir Henry Campbell-Bannerman (né Campbell; 7 September 1836 – 22 April 1908) was a British statesman and Liberal Party politician who was Prime Minister of the United Kingdom from 1905 to 1908 and Leader of the Liberal Party from 1899 to 1908. He also was Secretary of State for War twice, in the cabinets of Gladstone and Rosebery. He was the first First Lord of the Treasury to be officially called the "Prime Minister", the term only coming into official usage five days after he took office. He remains the only person to date to hold the positions of Prime Minister and Father of the House at the same time, and the last Liberal leader to gain a UK parliamentary majority.

Known colloquially as "CB", Campbell-Bannerman firmly believed in free trade, Irish Home Rule and the improvement of social conditions, including reduced working hours. A. J. A. Morris, in the Oxford Dictionary of National Biography, called him "Britain's first and only Radical prime minister". Following a general-election defeat in 1900, Campbell-Bannerman went on to lead the Liberal Party to a landslide victory over the Conservative Party at the 1906 general election – the last election in which the Liberals gained an overall majority in the House of Commons. The government he subsequently led passed legislation to ensure trade unions could not be liable for damages incurred during strike action, introduced free school meals for all children, and empowered local authorities to purchase agricultural land from private landlords. Campbell-Bannerman resigned as prime minister in April 1908 due to ill-health and was replaced by his chancellor, H. H. Asquith. He died 19 days later – the only prime minister to die in the official residence, 10 Downing Street.

Downing Street is a gated street in Westminster in London that houses the official residences and offices of the prime minister of the United Kingdom and the chancellor of the exchequer in a cul-de-sac situated off Whitehall, it is 200 metres (660 ft) long, and a few minutes' walk from the Houses of Parliament. Downing Street was built in the 1680s by Sir George Downing.

For more than three hundred years, it has held the official residences of both the First Lord of the Treasury, the office now synonymous with that of the Prime Minister, and the Second Lord of the Treasury, the office held by the Chancellor of the Exchequer. The Prime Minister's official residence is 10 Downing Street, and the Chancellor's official residence is Number 11. The government's Chief Whip has an official residence at Number 12. Over time, government offices and officials came to occupy most of the street's townhouses. The houses on the south side of the street were demolished in the 19th century to make way for government offices now occupied by the Foreign, Commonwealth and Development Office. Opposite, for part of the street, the Cabinet Office, initially Treasury, was built to face Whitehall.