Christopher Furlong / Getty Images 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."

Here are the Brexit odds from all major betting companies right now:

Ladbrokes — 5/4

— 5/4 Coral — 5/4

— 5/4 William Hill — 11/8

— 11/8 Skybet — 11/8

— 11/8 Paddy Power — 11/8

— 11/8 Betfair — 7/5

Sharpe added that if betting translated into voting, Brexit would win by a landslide.

"About 72% of all the bets we have taken since we first opened our book have been for Brexit," he said, "and if that were to be translated to voting patterns it would be all over."

Rival Ladbrokes have also slashed Brexit odds in line with the Leave surge:

"The political environment in the past couple of days has seen a huge shift of bets towards the Leave campaign," Matthew Shaddick, head of political betting at Ladbrokes, said. "The odds are now at their shortest since we opened the book and it is being driven by English and Welsh bettors."

Online and telephone polls on Monday showed a surge in the Leave side, suggesting 53% would vote for a Brexit. The Sun — the UK's most read newspaper — also came out for a Brexit this morning. It has never called wrongly called a General Election.