An Ipsos MORI survey for the'Evening Standard'newspaper shows those in favour of leaving the EU have now grabbed 53 per cent of the vote-share and those wanting to remain at 47 per cent. This gives Leave a 10 per cent lead compared to the previous poll, with Remain down 10 per cent.
Another phone-based survey carried out by Survation and IG found the Leave camp had extended its lead to 45 per cent with remain falling to 42 per cent.
The latest surveys resonate with the opinion polls in the past week by ORB, ICM, and YouGov, which also show the Vote Leave campaign gaining ground over Remain.
Supplementary questions in the polls indicate that key economic arguments made by Vote Leave are connecting with voters.
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"The Leave campaign is getting their messages across, especially on the key public concern on immigration. But the Remain camp is finding it much harder to convince people that their core economic messages, both on the risks of Brexit and the benefits of staying, is going to have a personal impact on their lives," said Gideon Skinner, Ipsos MORI head of political research.
A William Hill spokesperson said: "We are taking a higher percentage of individual bets for 'Leave' than ever before, and a significantly lower percentage of the overall stake money is for 'Remain' than for nearly two months."
Meanwhile, the clash between the two camps continued to intensify as senior Conservative party leaders accused the Bank of England and the UK Treasury of "peddling phoney forecasts" to scare people into voting to stay in the EU.
Cameron said: "It is deeply concerning that the Leave campaign is criticising the independent Bank of England. We should listen to experts when they warn us of the dangers to our economy of leaving the European Union."
Former UK chancellors Lord Lamont and Lord Lawson and Conservative party leaders Iain Duncan Smith and Lord Howard wrote countered in a letter to the 'Daily Telegraph': "There has been startling dishonesty in the economic debate, with a woeful failure on the part of the Bank of England, the Treasury and other official sources to present a fair and balanced analysis.