Boris Johnson's Conservative Party was set for a large majority in parliament after winning seats in traditional Labour heartlands as Labour leader Jeremy Corbyn said he would not contest the next election.
Results showed Johnson's strategy had successfully breached Labour's so-called "Red Wall" of seats across the Brexit-supporting areas of the Midlands and northern England where he cast his political foes as the out-of-touch enemies of Brexit.
Corbyn said he would quit as Labour leader after a "process of reflection".
Labour would get 191, the Liberal Democrats 13, the Brexit Party none and the SNP 55.
A win for Johnson's party means Britain will likely officially leave the European Union at the end of January and move on to the next stage of negotiations.
Earlier Johnson, re-elected by the Uxbridge electorate in London, said he did not want to "tempt fate", but it did look as though the Conservatives would win a majority.
She added: "We will not hang around obviously".
"That means getting Brexit done, having legislation and a Queen's speech so that we can actually start to introduce legislation and bills in Parliament".
General Election 2019 how the United Kingdom voted after 602 0f 650 seats.
However, though a poor result on the scale suggested by the exit poll could prompt Mr Corbyn to quit, the "Corbynism" philosophy blasted by Ms Hodge would likely remain following a four-year restructure of the party favouring his left-wing direction. And so I think there are very mixed messages coming out of Labour.
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"If it is anywhere near this it will be extremely disappointing for the party overall and for our movement", he said.
Labour leader Jeremy Corbyn poses outside the polling station at Pakeman Primary School, Holloway.
Results poured in early Friday showing a substantial shift in support to the Conservatives from Labour.
Tory Ian Levy edged out Labour to seize the seat with a majority of just 712, and thanked "Boris" in his victory speech.
"For @UKLabour leadership to blame Brexit for the result is mendacious nonsense".
Before the victory was official, Mr Johnson said it had proved to be a historic election.
Labour MP Margaret Hodge, a long-time rival of Mr Corbyn who used to lead Islington Council, blasted the poll as demonstrating the "failure of Corbyn and Corbynism". It means he would be in a position to get phase one of Brexit done by the end of January, said John Bercow, the former Speaker of the House.
Labour's fear campaign about the National Health Service has blown up in its face, with leader Jeremy Corbyn's unpopularity a key factor in the result.
Turnout was expected to be the highest at a general election in years after Brexit excited passion among voters on both sides of the debate.
"Leaving the European Union as one United Kingdom, taking back control of our laws, borders, money, our trade, immigration system, delivering on the democratic mandate of the people", he said, reprising the refrains of his successful Brexit referendum campaign of 2016. "We have put public ownership, a green industrial revolution, an end to austerity centre stage and introduced new ideas, such as plans for free broadband and free personal care". "We knew he was worse than useless at all the qualities you need to lead a political party". So the likelihood has to be that the pollsters have got it right again in 2019.