The pound surged to its highest level since May 2018 as an exit poll indicated Boris Johnson’s Conservative Party will secure a strong majority in the U.K. election, raising hopes of an end to the Brexit deadlock.

Sterling jumped as much as 2.7 per cent to US$1.3514, on course for the biggest single-session advance since Jan 2017. It also rallied by 2 per cent to 82.90 pence per euro, the strongest since 2016 and the aftermath of the EU referendum. The gains came as the survey undertaken by the BBC and other broadcasters said the party was on course to win 368 seats in the House of Commons, a majority of 86. That compares with the 28 seat majority projected by the YouGov opinion poll published earlier this week.

The sizable majority would allow Johnson to push his Brexit deal through Parliament by the end of January and move on to trade talks with the European Union, without having to rely on the votes of the pro-Brexit caucus known as the European Research Group.

“The numbers that people expected were 330 maybe 350 so to see 368 on the screen is incredible,” said Jordan Rochester, a currency strategist at Nomura International Plc in London, speaking to Bloomberg Television. “The pound’s at US$1.34, I think it can go to US$1.3450, US$1.35. Unless the exit poll is wrong, it can stay there.”

He said he just messaged his clients and told them “to go home folks, pop open a bottle of wine, get a night’s sleep.”

While exit polls don’t guarantee the final result, they have generally been reliable and one such survey in 2017 accurately predicted that then Prime Minister Theresa May would lose her majority in the last U.K. vote. Investors prefer the prospect of a Conservative majority government which can push through a Brexit accord and move on to the next phase of talks, with Johnson promising all of his lawmakers will back his deal.

“Johnson’s win means he can push through Brexit and into the next phase -- to me this signals that the worst of Europe’s malaise is behind us,” said Jack McIntyre, a portfolio manager at Brandywine Global Investment Management in Philadelphia. “The results take away a key risk in markets and while there’s still issues with U.S.-China trade, this U.K. election is one of the big ones. Long sterling is our biggest currency position outright.” The firm has a target of $1.50.

Though a Conservative majority is seen as the most market-friendly outcome, not everyone expects it to lead to a sustained sterling rally. Johnson pledged to “get Brexit done” by the end of January during the campaign, but in practice the deadline will signal the start of trade talks which could prove even more complicated than the process of negotiating Britain’s exit from the bloc.

“A strong majority means the withdrawal bill gets through in January and it also means the Prime Minister is less reliant on the ERG in trade negotiations next year,” said Jeremy Stretch, head of Group-of-10 currency strategy at Canadian Imperial Bank of Commerce. “I would still be wary of chasing the pound higher at these levels though.”

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Pulling All-Nighter

Traders are preparing for a long day. Some of HSBC Holding Plc’s currency sales and trading team in London will work overnight, while Barclays Plc plans additional staffing in New York, London and Singapore, according to spokespeople at the banks.

Investors have turned to the options market to hedge their positions. Bets that the pound will fall in the next week have surged to the highest level since the aftermath of the 2016 Brexit referendum.

“There is plenty of scope for a surprise,” said Jeremy Stretch, head of Group-of-10 currency strategy at Canadian Imperial Bank of Commerce, citing the unknowns of the turnout, tactical voting and poor weather in the U.K.’s first December election since 1923. Stretch will return to the office to work through the night.

Mark Dowding, a portfolio manager at BlueBay Asset Management in London, will be having a Christmas party with his team Thursday evening. He expects them all to be huddled around a television when the exit poll is released at 10 p.m., the so-called “witching hour” for currency markets between the end of New York’s day and the start of Asian trading.

“We will be waiting until morning before deciding on any trades,” he said. “We are skeptical there will be sufficient liquidity to trade much on overnight news.”

--With assistance from Eddie van der Walt