Question: Reginald Fletcher was minister of Civil Aviation under what British Labour politician who served as prime minister of the United Kingdom from 1945 to when?

full_context: Document 1: Clement Attlee: Clement Richard Attlee, 1st Earl Attlee, {'1': ", '2': ", '3': ", '4': "} (3 January 1883 – 8 October 1967) was a British Labour politician who served as Prime Minister of the United Kingdom from 1945 to 1951 and Leader of the Labour Party from 1935 to 1955. In 1940, Attlee took Labour into the wartime coalition government and served under Winston Churchill, becoming the first person to hold the office of Deputy Prime Minister of the United Kingdom. He went on to lead the Labour Party to an unexpected landslide victory at the 1945 general election; forming the first Labour majority government, and a mandate to implement its postwar reforms. The 12.0% national swing from the Conservatives to Labour was unprecedented at that time and remains the largest ever achieved by any party at a general election in British electoral history. He was re-elected with a narrow majority at the 1950 general election. In the following year, Attlee called a snap general election, hoping to increase his parliamentary majority. However, he was narrowly defeated by the Conservatives under the leadership of Winston Churchill; despite winning the most votes of any political party in any general election in British political history until the Conservative Party's fourth consecutive victory in 1992. Attlee remains the longest-ever serving Leader of the Labour Party.
Document 2: Winston Churchill: Sir Winston Leonard Spencer-Churchill, {'1': ", '2': ", '3': ", '4': "} (30 November 187424 January 1965) was a British statesman, army officer, and writer. He served as Prime Minister of the United Kingdom from 1940 to 1945 and again from 1951 to 1955. As a Member of Parliament (MP), he represented five constituencies over the course of his career. As Prime Minister, Churchill led Britain to victory during World War II. He led the Conservative Party for fifteen years from 1940 to 1955.
Document 3: James Callaghan: Leonard James Callaghan, Baron Callaghan of Cardiff, {'1': ", '2': ", '3': ", '4': "} (27 March 1912 – 26 March 2005), often known as Jim Callaghan, was a British politician who served as Prime Minister of the United Kingdom from 1976 to 1979 and Leader of the Labour Party from 1976 to 1980. Callaghan is to date, the only British politician in history to have served in all four of the "Great Offices of State", having been Chancellor of the Exchequer from 1964–67, Home Secretary from 1967-70, and Foreign Secretary from 1974, until his appointment as Prime Minister in 1976. As Prime Minister, he had some successes, but is mainly remembered for the "Winter of Discontent" of 1978–79. During a very cold winter, his battle with trade unions led to massive strikes that seriously inconvenienced the public, leading to his defeat in the polls by Conservative leader Margaret Thatcher.
Document 4: Cyril Fletcher: Cyril Fletcher (25 June 1913 – 2 January 2005) was an English comedian, actor and businessman. His catchphrase was 'Pin back your lugholes'. He was best known for his "Odd Odes", which later formed a section of the television show "That's Life!". He first began performing the Odd Odes in 1937, long before they first appeared on television (though he did appear on pre-World War II television).
Document 5: Reginald Fletcher, 1st Baron Winster: Reginald Thomas Herbert Fletcher, 1st Baron Winster (27 March 1885 – 7 June 1961) was a British Liberal then Labour politician. He was Minister of Civil Aviation under Clement Attlee between 1945 and 1946 and Governor of Cyprus between 1946 and 1949.
Document 6: Menzies Campbell: Walter Menzies Campbell, Baron Campbell of Pittenweem, {'1': ", '2': ", '3': ", '4': "} ( ; born 22 May 1941), often known as Ming Campbell, is a British Liberal Democrat politician, advocate and former athlete. He was the Member of Parliament (MP) for North East Fife from 1987 to 2015 and was the Leader of the Liberal Democrats from 2 March 2006 until 15 October 2007.
Document 7: Anthony Eden: Robert Anthony Eden, 1st Earl of Avon, (12 June 1897 – 14 January 1977) was a British Conservative politician who served three periods as Foreign Secretary and then a relatively brief term as Prime Minister of the United Kingdom from 1955 to 1957.
Document 8: Tony Blair: Anthony Charles Lynton Blair (born 6 May 1953) is a British politician who served as Prime Minister of the United Kingdom from 2 May 1997 to 27 June 2007 and Leader of the Labour Party from 21 July 1994 to 24 June 2007. He previously served as Leader of the Opposition from 21 July 1994 to 2 May 1997. He is the most recent British Labour Party leader to have won a general election.
Document 9: Later life of Winston Churchill: The later life of Winston Churchill documents the life of the British statesman from the end of World War II and his second term as Prime Minister of the United Kingdom, until his subsequent death and funeral in 1965. After the end of the war Churchill had to step down as Prime Minister of the United Kingdom because the Conservative Party lost the 1945 election. For six years he was to serve as the Leader of the Opposition. During these years Churchill continued to influence world affairs; in 1946 he gave his Iron Curtain speech which spoke of the expansionist policies of the USSR and the creation of the Eastern Bloc; Churchill also argued strongly for British independence from the European Coal and Steel Community (which he saw as a Franco-German project as Britain still had an empire). In the General Election of 1951 Labour was defeated and Churchill became Prime Minister for a second time. Churchill continued to lead Britain but was to suffer increasingly from health problems. Aware that he was slowing down both physically and mentally he resigned from the Cabinet in 1955. However he continued to sit as an MP for Woodford until he retired from politics in 1964. Churchill died on 24 January 1965 and was granted the honour of a state funeral. He was buried in his family plot in St Martin's Church, Bladon near to where he was born at Blenheim Palace.
Document 10: Robert Menzies: Sir Robert Gordon Menzies, {'1': ", '2': ", '3': ", '4': "} (20 December 189415 May 1978), was the Prime Minister of Australia from 1939 to 1941 and again from 1949 to 1966. He is Australia's longest-serving prime minister, serving over 18 years in total.
Document 11: Hugh Dalton: Edward Hugh John Neale Dalton, Baron Dalton PC (16 August 1887 – 13 February 1962) was a British Labour Party economist and politician who served as Chancellor of the Exchequer from 1945 to 1947. He shaped Labour Party foreign-policy in the 1930s, opposed pacifism, promoted rearmament against the German threat, and strongly opposed the appeasement policy of Prime Minister Neville Chamberlain in 1938. He served in Churchill's wartime coalition cabinet. As Chancellor, he pushed his cheap money policy too hard, and mishandled the sterling crisis of 1947. Dalton's political position was already in jeopardy in 1947, when, he, seemingly inadvertently, revealed a sentence of the budget to a reporter minutes before delivering his budget speech. Prime Minister Clement Attlee accepted his resignation, but he later returned to the cabinet in relatively minor positions.
Document 12: Premiership of Tony Blair: The premiership of Tony Blair began on 2 May 1997 and ended on 27 June 2007. Whilst serving as Prime Minister of the United Kingdom, Blair concurrently served as the First Lord of the Treasury, the Minister for the Civil Service, the Leader of the Labour Party (until Gordon Brown was declared Labour leader on 24 June 2007), and a member of parliament for the constituency of Sedgefield in County Durham. He remains a Privy Counsellor having first been appointed in July 1994 when he became Leader of the Opposition. Tony Blair is the Labour Party's longest-serving Prime Minister, and having led the party to three consecutive general election victories, the only Labour prime minister to serve two full consecutive terms.
Document 13: List of Prime Ministers of the United Kingdom: The Prime Minister of the United Kingdom is the head of the Government of the United Kingdom, and chairs Cabinet meetings. There is no specific date when the office of Prime Minister first appeared, as the role was not created but rather evolved over a period of time. The term was used in the House of Commons in 1805 and it was certainly in parliamentary use by the 1880s, and in 1905 the post of Prime Minister was officially given recognition in the order of precedence. Modern historians generally consider Sir Robert Walpole, who led the government of Great Britain from 1721 to 1742, as the first Prime Minister. Walpole is also the longest-serving Prime Minister by this definition. However, Sir Henry Campbell-Bannerman was the first Prime Minister and Margaret Thatcher the longest-serving Prime Minister to have been officially referred to as such.
Document 14: Reginald Denny (actor): Reginald Denny (born Reginald Leigh Dugmore, 20 November 1891 – 16 June 1967) was an English stage, film and television actor as well as an aviator and UAV pioneer. He was once an amateur boxing champion of Great Britain.
Document 15: Ernest Bevin: Ernest Bevin (9 March 1881 – 14 April 1951) was a British statesman, trade union leader, and Labour politician. He co-founded and served as general secretary of the powerful Transport and General Workers' Union from 1922–40, and as Minister of Labour in the war-time coalition government. He succeeded in maximizing the British labour supply, for both the armed services and domestic industrial production, with a minimum of strikes and disruption. His most important role came as Foreign Secretary in the post-war Labour Government, 1945–51. He gained American financial support, strongly opposed Communism, and aided in the creation of NATO. Bevin's tenure also saw the end of the Mandate of Palestine and the creation of the State of Israel. His biographer, Alan Bullock, said that Bevin "stands as the last of the line of foreign secretaries in the tradition created by Castlereagh, Canning and Palmerston in the first half of the 19th century," and that due to the reduction in British power he has no successors.
ground_truth: 1951