Bookmaker William Hill says that a Leave vote in the June 23 EU referendum will take over from Remain as the favourite by the weekend,
if not earlier - aligning with recent voter polls.
William Hill's Leave odds are now 11/8, but it says that by the weekend the odds could well be even shorter, suggesting a Brexit is likely to happen.
Graham Sharpe, media relations director for William Hill, said the company was having to shorten Leave odds daily, and that the betting was only going in one direction:
"We were forced to shorten our Brexit odds yet again overnight," he said "and having once been long-odds outsiders the odds have now come all the way down. The momentum is such that it seems inevitable Brexit will be favourite by the weekend if this trend continues."