Question: When was the prime minister first mentioned in a government document in the country with a team that uses the 25 North Colonnade?

full_context: Document 1: Riverside South (Canary Wharf): Riverside South is a proposed skyscraper development in Canary Wharf, London. Some below ground-level work was completed by 2014 on behalf of investment bank J.P. Morgan & Co., which bought a 999-year lease on the site with the intention of making the building its London office, but the firm has now moved into an existing Canary Wharf building. Future plans for Riverside South have not been publicised.
Document 2: Prime Minister of the United Kingdom: Since the office evolved rather than being instantly created, it may not be totally clear - cut who was the first Prime Minister. However, this appellation is traditionally given to Sir Robert Walpole, who became First Lord of the Treasury in 1721.
Document 3: Economy of the United Kingdom: Government involvement in the British economy is primarily exercised by Her Majesty's Treasury, headed by the Chancellor of the Exchequer, and the Department for Business, Energy and Industrial Strategy. Since 1979 management of the economy has followed a broadly laissez - faire approach. The Bank of England is the UK's central bank and its Monetary Policy Committee is responsible for setting interest rates, quantitative easing, and forward guidance.
Document 4: Consumer Financial Protection Bureau: Consumer Financial Protection Bureau Agency overview Formed July 21, 2011; 6 years ago (2011 - 07 - 21) Jurisdiction United States Headquarters Washington, D.C. Employees 1,623 (2016) Annual budget US $605.9 million (FY 2016) Agency executives Richard Cordray, Director David Silberman, Deputy Director Key document Dodd -- Frank Wall Street Reform and Consumer Protection Act Website www.consumerfinance.gov
Document 5: London: In the dense areas, most of the concentration is via medium- and high-rise buildings. London's skyscrapers such as 30 St Mary Axe, Tower 42, the Broadgate Tower and One Canada Square are mostly in the two financial districts, the City of London and Canary Wharf. High-rise development is restricted at certain sites if it would obstruct protected views of St Paul's Cathedral and other historic buildings. Nevertheless, there are a number of very tall skyscrapers in central London (see Tall buildings in London), including the 95-storey Shard London Bridge, the tallest building in the European Union.
Document 6: Prime minister: The United Kingdom's constitution, being uncodified and largely unwritten, makes no mention of a prime minister. Though it had de facto existed for centuries, its first mention in official state documents did not occur until the first decade of the twentieth century. Accordingly, it is often said "not to exist", indeed there are several instances of parliament declaring this to be the case. The prime minister sits in the cabinet solely by virtue of occupying another office, either First Lord of the Treasury (office in commission), or more rarely Chancellor of the Exchequer (the last of whom was Balfour in 1905).
Document 7: Prime Minister of the United Kingdom: Prime Minister of the United Kingdom of Great Britain and Northern Ireland Royal Arms used by Her Majesty's Government Incumbent Theresa May since 13 July 2016 (2016 - 07 - 13) Government of the United Kingdom Office of the Prime Minister Style Prime Minister (informal) The Right Honourable (within the UK and the Commonwealth) His / Her Excellency (in international correspondence) Member of Cabinet Privy Council European Council British -- Irish Council Reports to Parliament Residence 10 Downing Street Chequers Seat Westminster Appointer Monarch of the United Kingdom Term length At Her Majesty's pleasure Inaugural holder Sir Robert Walpole as First Lord of the Treasury and de facto first Prime Minister. Formation 4 April 1721 Salary £151,451 annual, including £76,011 MP's salary Website Official website
Document 8: One Raffles Quay: Designed by Kohn Pedersen Fox, One Raffles Quay (ORQ) consists of the 50-storey North Tower and the 29-storey South Tower, totalling about 1.3 million square feet of office space. The building was purpose-built for banking and financial corporations in August 2006.
Document 9: 25 North Colonnade: 25 North Colonnade is a commercial building in Canary Wharf, London formerly occupied by the Financial Conduct Authority, after having been solely occupied by its predecessor, the Financial Services Authority (FSA) until early 2013. It is tall, with 15 floors. Built in 1991, its developer was the Canary Wharf Group, and its architect was Troughton McAslan.
Document 10: William Miller (cashier): William Miller was the Chief Cashier of the Bank of England from 1864 to 1866. Miller was replaced as Chief Cashier by George Forbes.
Document 11: Prime minister: Canada's constitution, being a 'mixed' or hybrid constitution (a constitution that is partly formally codified and partly uncodified) originally did not make any reference whatsoever to a prime minister, with her or his specific duties and method of appointment instead dictated by "convention". In the Constitution Act, 1982, passing reference to a "Prime Minister of Canada" is added, though only regarding the composition of conferences of federal and provincial first ministers.
Document 12: Martin Wheatley: Martin Wheatley is a British financier, formerly managing director of the Consumer and Markets Business Unit of the Financial Services Authority in the UK, and is the former CEO of the Financial Conduct Authority.
Document 13: Martin Beaumont: Martin Dudley Beaumont CVO (born 6 August 1949) is a British businessman who was, until October 2007, the chief executive of the Co-operative group, today a £9.4 billion turnover enterprise employing in excess of 85,000 people across a diverse portfolio of businesses.
Document 14: Citigroup Centre, London: 25 Canada Square, or Citigroup Centre 2, stands at and, alongside HSBC Tower (with which it was built in tandem), is the joint 4th-tallest building in the United Kingdom (behind The Shard, One Canada Square and Heron Tower). Designed by César Pelli & Associates, construction of the 45-storey tower - undertaken by Canary Wharf Contractors - began in 1998 and was completed in 2001, with Citigroup leasing the building from the outset. The building was bought by RBS in 2004 along with 5 Canada Square (leased to Bank of America) for $1.12 billion. Subsequently, on 2 July 2007, CGC2 was individually sold to a joint venture between Quinlan Private and PropInvest for £1 billion (US$2 billion). Citigroup pay £46.5 million a year in rent for the tower, generating a yield of 4.6% to the owners. The east facing side of 25 Canada Square up to level 40 is configured for use by tenants.
Document 15: Prime minister: Walpole always denied that he was "prime minister", and throughout the 18th century parliamentarians and legal scholars continued to deny that any such position was known to the Constitution. George II and George III made strenuous efforts to reclaim the personal power of the monarch, but the increasing complexity and expense of government meant that a minister who could command the loyalty of the Commons was increasingly necessary. The long tenure of the wartime prime minister William Pitt the Younger (1783–1801), combined with the mental illness of George III, consolidated the power of the post. The title was first referred to on government documents during the administration of Benjamin Disraeli but did not appear in the formal British Order of precedence until 1905.
ground_truth: first decade of the twentieth century
sub_queries: What team uses 25 North Colonnade? Answer: Financial Conduct Authority
Financial Conduct Authority >> country Answer: UK
When was prime minister first mentioned in a government document in the UK ? Answer: first decade of the twentieth century