The results come as Jeremy Corbyn's party continues to fight allegations of systemic anti-Semitism within its membership, evidenced by a string of controversies that have dogged Labour since the last election.
Mrs May, who backed Remain in the referendum, will say she believes Brexit provides an opportunity to make the UK more global and outward-looking - a Britain alive with possibilities, more confident in itself, more united and more secure, a country our children and grandchildren are proud to call home.
"The first rule of leadership is to show up", declared Caroline Lucas, who leads the Green Party, during the heated debate, attacking Ms.
Despite having repeatedly said that she meant to follow the UK's Fixed Term Parliament that would have seen the next general election held in 2020, May had called a snap poll in order to win a strong mandate for negotiations over Britain's exit from the European Union (EU).
May had announced early on that she did not intend to attend any of the televised debates and would be focussing on door-to-door campaigning.
At a campaign rally in southwest England, May denied she was running scared.
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Of Prime Minister Theresa May she added: "I don't really trust her, I don't like her manners".
"I've always been Labour, my family's always been Labour", the 32-year-old told AFP, adding of May: "Good luck to her, but I don't think it's going to happen here".
But Mr Corbyn has insisted he would "make sure there's a deal" with the European Union were he to win.
The latest YouGov poll showed that the Conservatives are just 3 percentage points ahead of Labour.
"People have complained about him being a bit scruffy so he's smartened up a bit, but he's never going to be a media person, he's never going to conform to what the media wants him to be - which is another thing I really like him for". They won just eight seats and their share of the vote collapsed to eight percent.
But it follows a trend.
"Basildon used to be a Labour stronghold but it seems to have gone the other way".
Curtice, a professor of politics at the University of Strathclyde, said there are still many unknowns - especially whether young voters, who have shifted to Labour in large numbers, will actually turn out to vote on June 8. "That issue is not in doubt", he said. Her promise to be tough in the negotiations with the European Union drew cheers from the audience of mostly local Conservative activists installed on temporary chairs in a warehouse. "We are fighting to win this election".