Ed Miliband 's insistence that 'hell yes ' he is tough enough to be Prime Minister has secured Labour a bounce in the polls . The first full survey since Mr Miliband and David Cameron faced a TV grilling shows Labour has opened up a four-point lead over the Conservatives . But the party 's election strategy was in peril tonight after a senior campaign chief admitted that under Labour plans , borrowing would rise . The new YouGov survey has Labour on 36 per cent with the Tories trailing on 32 per cent . The four-point lead puts Labour on course to win 314 seats , with the Conservatives on 251 . 34 per cent of voters still think Mr Cameron would make the best PM , compared to 19 per cent for Mr Miliband , 9 per cent for Ukip leader Nigel Farage and 5 per cent for Lib Dem Nick Clegg . Recent polls have put the Tories and Labour within one or two points of each other . But the new YouGov survey has Labour on 36 per cent with the Tories trailing on 32 per cent . The four-point lead puts Labour on course to win 314 seats , with the Conservatives on 251 . But today Labour was accused of 'letting the cat out of the bag ' on plans to increase state borrowing . Election campaign vice-chairwoman Lucy Powell said the party 'may use some investment borrowing ' . Labour has promised only to eliminate the current deficit on day-to-day spending by the end of the next Parliament , leaving open the option of borrowing money to invest in capital projects . The Institute for Fiscal Studies says Labour 's plans allowed them to maintain an overall deficit as high as £30 billion by 2020 - at a time when the Tories aim to be running a surplus of £7 billion . ' Ms Powell later insisted she did not recognise the £30 billion figure , telling the BBC 's Sunday Politics : 'We are going to balance the books for current expenditure by the end of the Parliament . We may use some investment borrowing for much-needed investment but not for day-to-day spending . 'Those figures are other people 's figures . It depends on what the books are like . ' Conservative Treasury minister Priti Patel said : 'The cat 's out of the bag - Labour have finally had it dragged out of them that they 'd borrow more if Ed Miliband gets into Downing Street . ' In Thursday 's TV ocntest , Mr Miliband was called a 'North London geek ' who would be torn to shreds by Russian President Vladimir Putin . Jeremy Paxman appears to scratch his head mid-way through interviewing Prime Minister David Cameron . Mr Cameron is due to visit Buckingham Palace tomorrow to inform the Queen of the official start of the general election campaign . Mr Miliband faced the roughest ride during the Sky News/Channel TV battle , the first of the election campaign . The Labour leader was challenged by the studio audience about why he was so 'gloomy ' and told his brother David would have done a better job . During a bruising interview with Jeremy Paxman he was called a 'North London geek ' who would be torn to shreds by Russian President Vladimir Putin , and admitted Labour mistakes on spending , immigration and not tackling inequality . But he hit back at Paxman 's claim that Labour can not win a majority , insisting : 'You 're important Jeremy but not that important . It 's the British people who decide . ' And challenged about his ability to take difficult decisions , Mr Miliband shot back : But am I tough enough ? Hell yes , I 'm tough enough . ' The 'hell yes ' slogan has bee seized on by the Labour party , which has had it printed on t-shirts for sale to raise money for campaign coffers . A snap poll by ICM after Thursday 's contest showed Mr Cameron was the victor , with 54 per cent saying he was the winner to 46 per cent who backed Mr Miliband . But a YouGov survey for the Sunday Times showed 49 per cent thought the Labour leader came across the best as against 34 per cent for the Prime Minister . However , 34 per cent of voters still think Mr Cameron would make the best PM , compared to 19 per cent for Mr Miliband , 9 per cent for Ukip leader Nigel Farage and 5 per cent for Lib Dem Nick Clegg . Mr Miliband launched Labour 's election campaign on Friday claiming the race to Number 10 was 'neck and neck ' . Labour has also made gains in an Opinium poll for The Observer . The Tories dropped two points to 34 per cent in a week , with Labour unchanged on 33 per cent . The poll showed Ukip down one point on 13 per cent , while the Liberal Democrats were up one on 8 per cent . The Greens were also up one on 7 per cent .
New YouGov opinion poll puts Labour on 36 % and Tories on 32 % . Also suggests Labour leader came out on top in the first TV contest . David Cameron branded a 'North London geek ' who could not stand up to Putin . Miliband to visit the Queen on Monday to officially start campaign .