Supporters of Scottish independence from Britain have taken their first opinion poll lead since the referendum campaign began, indicating a real possibility that they might win, according to a YouGov survey for the Sunday Times newspaper.

With less than two weeks to go before the Sept 18 vote, the poll gave the "Yes" camp 51 percent support compared to the "No" camp's 49 percent, overturning a 22-point lead for the unionist campaign in just a month, the Sunday Times said.

YouGov said that the results excluded those who would not vote and those who did not plan to vote or did not know how they would vote. With those groups included, secessionists would be on 47 percent and those championing the United Kingdom would be on 45 percent, it added.