Now, with the May government facing yet another test of democracy, what will the results imply? With the gap between May and Labour leader Jeremy Corbyn reducing fast, analysts are deeply interested to see how things would unfold for May and her Brexit roadmap.
The rampage followed a suicide bombing that killed 22 adults and children at a pop concert in Manchester two weeks ago and an attack in March when five people died after a auto was driven into pedestrians on London's Westminster Bridge.
Britons are about to vote in an election that was supposed to be dominated by Brexit.
The U.K. election has turned a lot more unpredictable in recent weeks, increasing the risk of a pound plunge if the market's worst-case scenario unfolds in Thursday's vote, according to analysts. Ask people what kind of country, what kind of world, what kind of society they want to live in.
The last week of campaigning has been held in the shadow of an attack by three Islamist militants who on Saturday drove a van into pedestrians on London Bridge before attacking revelers in bars and restaurants with knives, killing at least seven people and injuring dozens. All these events have led to a situation where voters face very clear and distinct electoral choices: A pro-cuts, pro-Brexit, Conservative Party; an anti-cuts, pro-Brexit, left-wing Labour Party; or the anti-Brexit Liberal Democrats.
Corbyn said Thursday's vote offered a clear choice between "another five years of a Tory government, underfunding of services all across the United Kingdom. or a Labour government that invests for all, all across Britain".
The move was condemned by the opposition parties, with Lib Dem leader Tim Farron accusing her of "simply posturing", having been prepared to offer up the police for "cut after cut" when she was home secretary.
Mrs May's message focuses on Brexit - the reason she gave for calling Thursday's election 50 days ago - saying money previously spent on European Union projects will deliver "huge benefits" across the UK.
Corbyn, 68, began the campaign lowly rated as a leader and potential prime minister by many voters - and even by some of his own party candidates. Party was particularly important for those planning to vote Labour, 72% put it top compared to 56% of those planning to vote Conservative.
"There needs to be a strong injection of social awareness and a real willingness to deal with social problems", said Lawrence Dodd, who was holding a banner depicting Corbyn and John Lennon. She amended that with a larger but also incorrect figure.
A quarter of respondents who said they were not sure what their vote would be at the start of the campaign are now behind Labour, 23%, compared to 4% who have chose to vote Conservative, although 68% still have not made up their minds.
Opponents accused May of undermining the rights of citizens for political gain.
UKIP, which played a key role in Britain's vote to leave the European Union past year, got almost 13 percent of the vote in the last election in 2015 but now languishes at about 4 percent in the polls. But while May's warning could have backfired at other times, it is certainly not the case now. I do not see the urgency or the need for an independence referendum. But Sturgeon's plan did not prove to be true as the Scots did not pursue it, thanks to the uncertainties caused by Brexit. Her answer - too much government - came to influence Britain for decades.