LONDON - Pollster Ipsos MORI says a survey conducted on Wednesday and Thursday suggests the "remain" side will win Britain's EU referendum by a margin of 54 percent to 46 percent.

Earlier Thursday, the firm released a poll conducted Wednesday that indicated a 52-48 victory for "remain." That phone poll of 1,592 people had a margin of error of plus or minus three percentage points.

The firm's chief executive, Ben Page, said continued polling on Thursday - referendum day - suggested a bigger swing to "remain" that gave the 54-46 result.

Britons were voting on whether or not to leave the 28-nation European Union.