The Conservatives have won the general election and Boris Johnson will enjoy a commanding House of Commons majority, the broadcasters' exit poll suggests.
The poll - conducted by Ipsos MORI on behalf of Sky News, the BBC and ITV News - forecasts the Tories will win 368 seats, with Labour on 191 seats, the SNP on 55 seats and the Liberal Democrats on 13 seats.
To form a majority government in the Commons, a party needs to win more than 325 seats.
The exit poll suggests Labour are set for a hugely disappointing night, with the party forecast to secure their lowest number of seats for decades.
At the last election in June 2017, Labour leader Jeremy Corbyn saw his party win 262 seats.
The exit poll numbers would give Prime Minister Boris Johnson a Commons majority of 86, vindicating his decision to push for a winter election.
It also puts the UK on course to leave the EU on 31 January, after Mr Johnson fought the election campaign on his promise to "get Brexit done".
In terms of seats, the exit poll suggests the Conservatives are on course for their best result since the 1987 election.
By contrast, Labour are set for their lowest number of seats since 1935.
Labour's shadow international trade secretary Barry Gardiner described the exit poll as a "devastating blow".
"It certainly doesn't look good," he told Sky News.
"In one sense, we always knew this election was going to be focused on Brexit and that is the strategy the Conservatives played.
"It's a deeply depressing prediction."
Conservative Party chairman James Cleverly said: "I've always felt polls should be taken with a degree of caution.
"Maths is maths and if - a big if - the numbers play out as per that exit poll that is numerically a big majority.
"We want to see if it plays out."
In Scotland, the SNP are set to return to near complete dominance, with the exit poll suggesting they will win 55 out of the country's 59 constituencies and getting close to the 56 seats they won in 2015.
SNP leader and Scottish First Minister Nicola Sturgeon posted on Twitter: "Exit poll suggests good night for @theSNP - but it is just an exit poll and there are many marginals, so let's just wait and see.
"What it indicates UK wide though is grim."
Under the exit poll numbers, the Lib Dems are on course to add one seat to the 12 they won at the last election in 2017.
The Brexit Party appear to have failed to make a breakthrough at Westminster, with the exit poll suggesting they won't win a seat.
Plaid Cymru are forecast to have won three seats, with all other parties and independents winning 19.
The team behind the exit poll said: "The Conservatives are expected to advance most strongly and Labour fall back most in areas that voted most strongly for Leave, many of them more working-class seats."
The exit poll results are based on 22,790 interviews as people exited 144 polling stations across Great Britain.
Sky News' election analysts Michael Thrasher and Will Jennings said the exit poll shows the Tories are set to secure a "clear mandate for Boris Johnson and his Brexit deal".
They added: "Labour's vote has fallen everywhere but the decline is less in London and parts of southern England.
"The party's heartlands have moved away from the former industrial and manufacturing towns of the country to the major cities.
"Labour's overall loss of 71 seats will make Corbyn one of the least successful of all Labour leaders."
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