UK Prime Minister Boris Johnson won a resounding election victory on Friday that will allow him to take Britain out of the European Union in matter of weeks.

For Johnson, whose 20-week tenure in power has been marked by chaotic scenes in parliament and stark division on the streets over Britain’s tortuous departure from the European Union, victory in Thursday’s contest was vindication.

Educated at the country’s most elite school and recognisable by his bombastic style, the 55-year-old must not only deliver Brexit but also convince Britons that the contentious divorce, which would lead to lengthy trade talks, is worth it.

A landslide Conservative win marks the ultimate failure of opponents of Britain’s departure from the European Union who plotted to thwart a 2016 referendum vote through legislative combat in parliament and prompted some of the biggest protests in recent British history.

Johnson won an outright majority in the 650-seat parliament after an exit poll showed the Conservatives on course to win a landslide 368 seats — the biggest Conservative national election win since Margaret Thatcher’s 1987 triumph.

“I think this will turn out to be a historic election that gives us now, in this new government, the chance to respect the democratic will of the British people,” Johnson said after winning his seat of Uxbridge.

He said the Conservatives appeared to have won “a powerful new mandate to get Brexit done”.

US President Donald Trump congratulated Johnson on his election victory, saying their two countries were now free to strike a "massive" new trade deal.

"Congratulations to Boris Johnson on his great WIN!," Trump tweeted.

"Britain and the United States will now be free to strike a massive new Trade Deal after BREXIT. This deal has the potential to be far bigger and more lucrative than any deal that could be made with the E.U. Celebrate Boris!"

Labour were forecast to win 203 seats, the worst result for the party since 1935, after offering voters a second referendum and the most radical socialist government in generations. Labour leader Jeremy Corbyn said he would step down.

With results from across Britain indicating the exit poll was accurate, Johnson’s bet on a snap election has paid off, meaning he will swiftly ratify the Brexit deal he struck with the EU so that the United Kingdom can leave on January 31 — 10 months later than initially planned.

But nearly half a century after joining what has become the world’s largest trading bloc, Johnson faces the daunting challenge of striking new international trade deals, preserving London’s position as a top global financial capital and keeping the United Kingdom together.

Sterling soared and was on course for one of its biggest one-day gains in the past two decades. The pound hit a 19-month high of $1.3516 versus the dollar and its strongest levels against the euro since shortly after the 2016 Brexit referendum.

As of 0510 GMT, Johnson’s Conservatives had made a net gain of 41 seats.

Brexit far from over

After nearly four years of Brexit debate that has riven the United Kingdom, deadlocked parliament and shocked allies, a majority will allow Johnson to lead the United Kingdom out of the club it first joined in 1973.

But Brexit is far from over.

He faces the daunting task of negotiating a trade agreement with the EU, possibly in just 11 months, while also negotiating another trade deal with US President Donald Trump.

The outcome of the negotiations will shape the future of Britain’s economy. After Jan 31, Britain will enter a transition period during which it will negotiate a new relationship with the remaining 27 EU states.

This can run until the end of December 2022 under the current rules, but the Conservatives made an election promise not to extend the transition period beyond the end of 2020.

A big majority may give him the political security to extend the trade talks beyond 2020 because he could overrule the Brexit hardliner European Research Group (ERG) faction in the party.

“The bigger the Tory majority of course the less influence over this the ERG and Eurosceptics will have,” said Brexit party leader Nigel Farage. “It will be called Brexit but it won’t really be.”

Labour defeat

Johnson called the first Christmas election since 1923 to break what he said was the paralysis of Britain’s political system after more than three years of crisis over Brexit.

The face of the victorious “Leave” campaign in the 2016 referendum, Johnson fought the election under the slogan of “Get Brexit Done”, promising to end the deadlock and spend more on health, education and the police.

He was helped early in the election by Farage’s Brexit Party which stood down hundreds of candidates to prevent the pro-Brexit vote from being split. Early results showed the Brexit Party had poached a significant number of voters from Labour.

While Brexit framed the election, the slow-motion exit from the EU has variously fatigued, enthused and enraged voters while eroding loyalties to the two major parties.

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.

The Conservatives took Sedgefield, once held by former Prime Minister Tony Blair, Labour’s most successful leader.

A defeated Labour now faces a civil war between the socialists who control it and more moderate factions which will demand power.

“This is obviously a very disappointing night for the Labour Party with the result that we’ve got,” Corbyn said after being re-elected in his own north London electoral seat. He said he would not lead the party in any future elections.

Weary Labour candidates said his leadership had played a major role in the defeat.

Ruth Smeeth, who said she also expected to lose her seat in Stoke-on-Trent, laid the blame firmly at Corbyn’s door.

“He should have gone many, many, many months ago,” she said.

The Liberal Democrats were forecast to win 13 seats, the exit poll said. Jo Swinson, Liberal Democrat party leader, lost her seat to the Scottish National Party.

The Brexit Party were not predicted to win any.

The Scottish National Party, which strongly opposes Brexit, would win 55 of the 59 seats in Scotland, the poll said, setting the scene for it to demand a second independence vote, after secession was rejected by 55% to 45% in 2014.

Scotland’s first minister, Nicola Sturgeon, said Johnson did not have a mandate to take Scotland out of the EU.

“We don’t want Brexit,” Sturgeon said. “Boris Johnson may have a mandate to take England out of the European Union, he emphatically does not have a mandate to take Scotland out of the European Union.”