People cast their vote in the General Election at a polling station in the Rotunda Boxing Gym in Liverpool, England, Thursday, June 8, 2017. While the UKIP had done well in many Conservative strongholds in 2015, recent local elections had shown support for the party had collapsed as the Conservatives became the party of Brexit voters.
Brexit led to Cameron's resignation previous year and May's selection by the Tories as their leader.
It remains to be seen whether Labour's poll resurgence equates to more votes on the day.
Two deadly attacks transformed the campaign, pushing terrorism and security to the top of the agenda.
Eight people were killed near London Bridge when three men drove a van into pedestrians then stabbed revelers in an area filled with bars and restaurants.
But regardless, Corbyn's strong campaign has only swelled admiration for him among party members and supporters.
There are 75 constituencies in the North West, which as of the 2015 general election was dominated by Labour with 50 MPs, Conservatives with 22, Liberal Democrats with two, and one Independent.
Overall turnout in 2015 was 66.4 per cent, up from 2010.
Polls opened at 7:00am and will close at 10:00pm.
Outside of the European Central Bank rate decision the Euro may retreat on Friday following the release of the Germany's latest Trade Balance figures, with some analysts forecasting the trade surplus is likely to have tumbled in April, possibly indicating a weaker second quarter for the German economy.
The odds seem to be in favour of May holding on to her job as the British Prime Minister who called for snap polls 52 days ago.More news: Epic Games' Fortnite is Coming to Xbox One in July
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Polls are open from 7 a.m. until 10 p.m. (0600GMT to 2100GMT) on Thursday, and results should be known in the early hours of Friday.
In her final message to voters, May appealed directly to the undecided, urging them to support her in negotiating the best deal for Britain as it leaves the European Union.
"Never before has there been a clearer choice between the parties. a choice quite simply between hope and fear", he said.
A flurry of opinion polls published on Wednesday put the Conservative lead in a range of 1 to 12 percentage points, with most suggesting that May would increase her majority in parliament.
Right now, the Conservatives hold 330 of Parliament's 650 seats, meaning they have a slim majority of just five seats.
This forecast is echoed in the almost 100 million pounds expected to be bet on the outcome of the polls.
Even many of those voters acknowledged, though, that sitting Labour MP Richard Burden was a popular and hard-working constituency representative and had a strong chance of retaining his seat.
The Conservatives, who polled at 39 per cent, came out marginally ahead of Labour, who received 35 per cent of the vote. Many U.S. readers will remember the surprise after the Brexit vote, as many polls had failed to correctly gauge the momentum of the anti-EU movement.
All the major parties wrapped up their campaigning yesterday with a last-ditch effort to swing undecided voters.
But the Conservative government's record on cutting funding for health and education have also featured strongly in the campaign, to the benefit of Labour. We need to secure our economy for the future, we need to ensure we are getting more jobs, better-paid jobs, more opportunities for young people in this country.
"I just hope Corbyn don't get in because he will cause trouble for the country", she said.