"Labour will give our NHS the resources it needs to deliver the best possible care for patients, and end the Conservatives' attacks on our hardworking health workers, who care for us all". The Liberal Democrats were on 6% and Ukip on 3%.
Two days from a national election, Britain's ruling Conservatives and opposition Labor Party battled to defend their records on security after a terrorist attack that killed seven people in London upended the campaign.
Brexit, which had been expected to dominate the campaign, has played a surprisingly small role.
Three in 10 of respondents who said they were not sure what their vote would be at the start of the campaign are now behind Labour, 27 per cent, compared to four per cent who have chose to vote Conservative, although 59 per cent still have not made up their minds. Neither party has provided many details of how this will be accomplished. "Not the Few"; the few, Corbyn repeatedly pointed out, were the rich and the very rich, for whom the Conservative government had reduced taxes, ignoring the plight of the masses of poor.
Asked if he would put together a coalition if there was a hung parliament, Mr Corbyn said that he is fighting to win the election outright.
May has also promised to crack down on extremism if she wins - even if that means watering down human rights legislation.
The PM claimed a successful Brexit negotiation would provide opportunities for "more jobs, more homes, better roads and railways, and world-class digital connectivity wherever you live".
Two deadly attacks transformed the campaign, pushing terrorism and security to the top of the agenda.
Following attacks in Manchester and London that killed 29 people, voters are anxiously aware of the threat the country faces from worldwide terrorism, and demanding to know why authorities failed to apprehend suspects whose extremist leanings were well-known. When it resumed, May was facing questions about her record as Britain's interior minister between 2010 and 2016 - years in which police budgets were cut and the number of officers fell by nearly 20,000.
Meanwhile, British police hunting for a Frenchman missing since Saturday's attack on London Bridge said they had found a body in the River Thames, potentially taking the death toll to eight. And Conservatives had a massive 20-point lead in the polls against Labour.
"If you look at the polls when the election started, he was 25 percent behind Theresa May, there are now polls showing it at one percent", said Socialist Party member Dan Crawter, 24.
Although the Conservatives seem to be leading in the run-up to the elections, many are preparing for the unexpected as the British electoral system is based on the principle of first past the post, which can exaggerate parliamentary majorities where the majority vote in a constituency gets the win.