Question:  A British Conservative politician who served three periods as what, that had  a substantially increased majority of 60 for the Conservative government against the Labour Party?

Context articles: Clement Attlee
Conservative Party (UK)
Anthony Eden
Robert Halfon
Helen Southworth
Wednesbury by-election, 1957
South Ayrshire
United Kingdom general election, 1955
Steve Brine
Nick Brown

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.
The Conservative Party, officially the Conservative and Unionist Party, is a centre-right political party in the United Kingdom.
 It is currently the governing party, having been so since the 2010 general election, where a coalition government with the Liberal Democrats was formed.
 In 2015, the Conservatives led by David Cameron won a surprise majority and formed the first Conservative majority government since 1992.
 However, the 2017 snap election on Thursday 8 June resulted in a hung parliament, and the Conservatives lost their parliamentary majority.
 They are reliant on the support of a Northern Irish political party, the Democratic Unionist Party (DUP), in order to command a majority in the House of Commons through a confidence-and-supply deal.
 The party leader, Theresa May, has served as both Leader of the Conservative Party and Prime Minister since 13 July 2016.
 It is the largest party in local government with 9,237 councillors.
 The Conservative Party is one of the two major contemporary political parties in the United Kingdom, the other being its modern rival, the Labour Party.
 The Conservative Party's platform involves support for free market capitalism, free enterprise, fiscal conservatism, a strong national defence, deregulation, and restrictions on trade unions.
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.
Robert Henry Halfon ( ) (born 22 March 1969) is a British Conservative Party politician who served as Minister of State for Education between 2016 and 2017, and as the Member of Parliament (MP) for Harlow since 2010.
 He was re-elected with an increased majority of 8,350 in 2015, and a reduced majority of 7,031 in 2017.
Helen Mary Southworth (born 13 November 1956) is a Labour Party politician in the United Kingdom.
 She is the former Member of Parliament (MP) for Warrington South, and was first elected at the 1997 general election.
 She retained the Warrington South seat at the 2001 and 2005 general elections, each time with a reduced majority.
 On 15 June 2009, she announced that she would be retiring at the next general election.
 The seat that she vacated was subsequently won for the Conservative Party by David Mowat.
 She was the only person to have won successive elections in the constituency until her successor, Conservative David Mowat, won the 2015 General Election with an increased majority.
The 1957 Wednesbury by-election was held on 28 February 1957 after the incumbent Labour MP, Stanley Evans, resigned from the House of Commons and the Labour Party after he had refused to vote against the Conservative government on the Suez Crisis.
 The Labour candidate, John Stonehouse, retained the seat with an increased majority.
South Ayrshire (Scots: "Sooth Ayrshire" ; Scottish Gaelic: "Siorrachd Inbhir Àir a Deas" , ] ) is one of thirty-two council areas of Scotland, covering the southern part of Ayrshire.
 It borders onto Dumfries and Galloway, East Ayrshire and North Ayrshire.
 Prior to 2017, the Conservative Party led a minority administration in South Ayrshire, with Bill McIntosh as Leader of the Council and Labour's Helen Moonie as Provost, working within a partnership agreement with the Labour Party, supported by both Independents.
 Following the election, Labour and the Scottish National Party announced an agreement to control the council, again supported by both independents, despite the fact that the Conservatives emerged as the largest party on the council with an increased majority, with the SNP's Douglas Campbell serving as Leader of the Council and Labour's Helen Moonie returning as Provost.
The 1955 United Kingdom general election was held on 26 May 1955, four years after the previous general election.
 It resulted in a substantially increased majority of 60 for the Conservative government under new leader and prime minister Sir Anthony Eden against the Labour Party, then in their twentieth year of leadership by Clement Attlee.
Stephen Charles Brine (born 28 January 1974) is a British Conservative Party politician and the Member of Parliament (MP) for Winchester.
 In the 2010 general election, he had a majority of 3,048 (5.4%) over the Liberal Democrat candidate Martin Tod.
 He was re-elected to the House of Commons in the 2015 general election with an increased majority of 16,914 (30.6%).
, and then again in the 2017 general election with a reduced majority of 9,999 (17.5%).
Nicholas Hugh Brown (born 13 June 1950) is a British Labour Party politician who has been the Member of Parliament (MP) for Newcastle upon Tyne East since 1983.
 He has served as Minister of Agriculture, Fisheries and Food, Minister of State for Work and Pensions and Deputy Chief Whip.
 He has also served three separate terms as the Labour Party's Chief Whip, from 1997 to 1998, 2008 to 2010, and from 2016 to the present.
 His terms as chief whip have spanned periods in both government and opposition.