EXPRESS An Opinium poll has given Leave a one per cent lead with just hours until the EU referendum

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The bombshell survey, by respected pollsters TNS, shows Brexit has surged ahead by 49 per cent to 42 per cent once people's likelihood to vote is taken into account. It will send shockwaves through Downing Street tonight, which has shown increasing signs of nerves over how the referendum will pan out amid fierce criticism of David Cameron's Project Fear campaign. Analysts at the firm surveyed 2,320 adults across the UK online between June 16-22. Their baseline results reveal a two per cent lead for the Leave campaign, with support for Brexit at 43 per cent compared to 41 per cent for Remain.

However, experts say that once the result is adjusted to take into account respondents' stated likelihood to vote the Brexit camp's lead grows to a cavernous seven points. Luke Taylor, Head of Social and Political Attitudes at TNS UK said: “With many members of the public still undecided or not planning to vote there is uncertainty around the outcome of the referendum. “Our latest poll suggests that Leave is in a stronger position than Remain but it should be noted that in the Scottish Independence Referendum and the 1995 Quebec Independence Referendum there was a late swing to the status quo and it is possible that the same will happen here. “Clearly, with a race as close as this, the turnout level among different demographic groups will be critical in determining the result."

REUTERS The poll result will come as a huge blow to David Cameron

AFP Boris Johnson has been on the campaign trail today drumming up support for Brexit

45 per cent said they would vote to Leave the EU with 44 per cent wanting to Remain in the 28-country bloc

The bombshell survey was released just hours after a separate poll by Opinium revealed a one per cent lead for the Leave campaign. In the analysts' final survey before polling stations open at 7am tomorrow, 45 per cent said they would vote to Leave the EU with 44 per cent wanting to Remain in the 28-country bloc. Nine per cent of those asked said they still did not know how to vote, suggesting as yet undecided Britons will be key to Friday morning’s result. Two per cent did not want to declare which way they will vote. The pollsters said the narrow margin between Leave and Remain means the EU referendum is a “statistical dead heat” with both side within the margin of error of the other. More than 3,000 British adults were quizzed online between Monday and today.

Meanwhile two polls, published late tonight gave the Remain camp a lead going into tomorrow's historic vote. A survey for YouGov recorded 51 per cent support for Remain and 49 per cent for Leave whilst a poll by ComRes, which falls well outside the standard margin of error of plus or minus three points, shows Remain on 54 per cent and Leave on 46 per cent. Both sides of the EU referendum debate have been out campaigning today in a last-ditch effort to persuade voters before they enter polling booths tomorrow.David Cameron teamed up with former prime minister John Major and ex-Labour deputy leader Harriet Harman to urge Britons to Remain in the EU. Labour leader Jeremy Corbyn held a final rally with London mayor Sadiq Khan, Welsh First Minister Carwyn Jones and the party’s Scottish leader Kezia Dugdale. Leading the fight for Brexit both Boris Johnson and Michael Gove were out campaigning for Vote Leave, while Ukip leader Nigel Farage delivered a final impassioned speech in London. Yesterday, a YouGov poll showed a majority of voters want Britain to quit the EU.

12 reasons why you should vote IN or OUT of EU Tue, May 10, 2016 We take a look through 12 reasons you should vote IN or OUT of the EU as Britain decides on June 23rd 2016. Play slideshow Getty 1 of 13 12 reasons why you should vote IN or OUT of EU