The 1955 United Kingdom general election was held on Thursday 26 May 1955, four years after the previous general election in 1951. 
It was a snap election: after Winston Churchill retired in April 1955, Anthony Eden took over and immediately called the election in order to gain a mandate for his government.
It resulted in a majority of 60 seats for the government; the result remains the largest party share of the vote at a post-war general election. This was the first general election to be held during the reign of Elizabeth II. She had succeeded her father George VI the year after the previous election.
Results.
The election was fought on new boundaries, with five seats added to the 625 fought in 1951. At the same time, the Conservative Party had returned to power for the first time since World War II and increased its popularity by accepting the mixed economy and welfare state created by the previous Labour Party government. It also was lauded for its economic policy after ending rationing, improving foreign trade, and even outperforming Labour in the construction of public housing. The "giveaway budget" of Chancellor Rab Butler prior to the election also improved the popularity of the Conservative Party. On election day, the "Daily Mirror" had printed the front-page headline "Don't Let the Tories Cheat Our Children", urging its readers to elect Labour on the basis that it had "built a better Britain for us all".
The BBC later described the election as one of the "dullest" after World War II. The "Daily Express" wrote that the British people were more interested in Princess Margaret's romance with Peter Townsend. The Labour Party, then in its twentieth year of leadership under Clement Attlee, steadily lost ground owing to infighting between the left-wing (Bevanites) and the right-wing (Gaitskellites), resulting in an unclear election message. It pledged equal pay for women, renationalization of the steel industry and road haulage, comprehensive secondary education, and vague guarantees of greater industrial democracy and workers' control of nationalized industries as demanded by Bevanites but otherwise offered little new policy. It was the fifth and last general election fought by Labour leader Clement Attlee, who by this time was 72 years old. Eden had only become Leader of the Conservative Party a few weeks before the election, after the retirement of former Prime Minister Winston Churchill, but he had long been considered the heir apparent to the Conservative leadership. Eden called a dissolution of parliament and a new general election as soon as he took office in April 1955. The Conservatives were hoping to take advantage of the end of food rationing and the positive atmosphere created by the coronation of Queen Elizabeth II in 1953. Eden himself was telegenic (although not as great a public speaker as Churchill, who was now infirm and 80 years old) and gradual economic growth benefited the party greatly. Parliament was dissolved on 6 May.
The result showed very little change from 1951, with fewer than 25 seats changing hands and only a small swing from Labour to the Conservatives. The only real highlight of the night was in Northern Ireland, where Sinn Féin won two seats at a UK election for the first time since 1918 (before the secession of Southern Ireland). 
The Labour Party suffered at this time from deep internal divisions, yet for it this election was not the disaster it could have been.
Although little changed, this was a strong victory for the Conservatives, who won the largest share of seats for a single party at a post-war general election. It became the first party since the passage of the Reform Act 1867 to increase its parliamentary majority after a term in office.
The Liberal Party had yet another poor performance, only slightly improving their popular vote total from the previous election, and again winning just six seats. Five of their six seats did not have Conservative challengers, as per local-level agreements to avoid vote-splitting which likely would have thrown the seats to Labour; the only Liberal candidate to be victorious against both Conservative and Labour challengers was Orkney and Shetland MP Jo Grimond, who was first elected in 1950. The poor national showing was widely viewed as the death knell for the embattled leadership of Clement Davies, who resigned the following year and was replaced by Grimond.
Future Labour leader Michael Foot lost his seat of Plymouth Devonport at this election; he returned for Ebbw Vale at a 1960 by-election.
For the first time, television took a prominent role in the campaign; this is the earliest UK general election of which television coverage survives (the 1950 and 1951 election nights were broadcast on television live, but the footage was not recorded). Only three hours of the coverage, presented by Richard Dimbleby, was kept; this was rebroadcast on BBC Parliament on the fiftieth and sixtieth anniversaries of the date of the election.
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Transfers of seats.
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1 Sinn Féin winner overturned on petition for a criminal conviction. The second-placed Ulster Unionist candidate was also overturned by resolution of the House; eventually the 1956 by-election was held, which returned an Independent Unionist.
2 Sinn Féin winner overturned on petition for a criminal conviction. The second-placed candidate, an Ulster Unionist, was awarded the seat.
References.
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