Of those surveyed, 56 percent said they would probably or definitely vote for Britain to split from the EU, as anti-EU sentiment sweeps all three main political parties in the country, The Observer reported Saturday.
About 68 percent of Conservative voters said they would leave the EU and 44 percent of Labor voters and 39 percent of Liberal Democrats agreed.
Voters ages 18-34 were the only age group in which a majority backed the EU, with 44 percent preferring to maintain membership and 25 percent wanting out.
The poll comes as Prime Minister David Cameron prepares for a Brussels summit, scheduled to begin Thursday, to negotiate a deal on the EU budget. Cameron initially said he wanted a freeze on EU spending, but pressure in Britain is leading him to ask for a reduction in spending, a position no other EU country will likely support, The Observer reported.
The number of people surveyed and the margin of error were not reported.