The Conservatives are set to win an overall majority of 86 in the general election, according to an exit poll for the BBC, ITV and Sky News.
The survey taken at UK polling stations suggests the Tories will get 368 MPs – 50 more than at the 2017 election – when all the results have been counted.
Labour would get 191, the Lib Dems 13, the Brexit Party none and the SNP 55.
The Green Party will still have one MP and Plaid Cymru will lose one seat for a total of three, the survey suggests.
The first general election results are due before midnight (UK time), with the final total expected to be known by Friday lunchtime.
In the exit poll, voters are asked to fill in a mock ballot paper as they leave the polling station indicating how they have just voted.
The exit poll was conducted by Ipsos Mori at 144 polling stations, with 22,790 interviews.
Exit polls have proved to be very accurate in recent years. In 2017 it correctly predicted a hung Parliament, with no overall winner, and in 2015 it predicted the Conservatives would be the largest party.