Opinion polling for the next United Kingdom general election

Surveys conducted before the next United Kingdom general election that estimate voting intentions and related political attitudes. Their results are estimates, not predictions of the final vote.

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Opinion poll: A survey that estimates the views or intentions of a population from responses by a sample. Election-intention polls are one specialized use of opinion polling.
Voting intention: A survey respondent's stated preference for a party or candidate in an election. This is the central attitude measured by most pre-election polls.
Poll of polls: A summary that combines results from multiple opinion polls, often by averaging them. Aggregates smooth differences among individual polls without eliminating shared errors.
Opinion polling for the 2015 United Kingdom general election: Pre-election surveys that estimated party support before the 2015 UK general election. The polls substantially underestimated the Conservative lead in the final result.
Voter turnout: The proportion of eligible voters who cast a ballot in an election. Polls must estimate who will vote as well as how respondents say they will vote.
Sampling error: The uncertainty that arises because a survey measures a sample rather than an entire population. A poll's reported margin of error mainly captures variation from random sampling.
United Kingdom general election: A nationwide election in which voters choose Members of Parliament for the House of Commons. These polls estimate preferences for the election they precede.
Online panel: A group of people recruited to take surveys over the internet, repeatedly or periodically. Many UK voting-intention polls draw respondents from online panels.
Opinion polling for the 2017 United Kingdom general election: Pre-election surveys that estimated party support before the 2017 UK general election. The campaign's changing support made polling movement central to election coverage.
Late swing: A change in voter preference occurring near the end of an election campaign. Late shifts can make otherwise accurate earlier surveys poor guides to election day.