If an election were held now, 25 percent of Britons said they would vote Labour, the joint lowest score in ICM polling history for the Guardian, the paper said.
The Conservatives were on 41 percent, unchanged from a similar poll in July.
The poll is more bad news for Brown who has suffered a bruising few months over an expenses scandal embroiling lawmakers from all parties and as Britain struggles to recover from the worst recession in decades.
A recent row over the Conservatives' commitment to funding the National Health Service has failed to dent its lead in the polls, the newspaper said.
ICM interviewed 1,004 British adults by telephone between 21-23 August.
A poll in this week's Independent on Sunday newspaper put the Conservatives on 41 percent, some 17 percent ahead of Labour on 24 percent.
A general election must be held by June 2010 at the latest with Labour, in power since May 1997, widely tipped to lose.
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The Conservatives were on 41 percent, unchanged from a similar poll in July.
The poll is more bad news for Brown who has suffered a bruising few months over an expenses scandal embroiling lawmakers from all parties and as Britain struggles to recover from the worst recession in decades.
A recent row over the Conservatives' commitment to funding the National Health Service has failed to dent its lead in the polls, the newspaper said.
ICM interviewed 1,004 British adults by telephone between 21-23 August.
A poll in this week's Independent on Sunday newspaper put the Conservatives on 41 percent, some 17 percent ahead of Labour on 24 percent.
A general election must be held by June 2010 at the latest with Labour, in power since May 1997, widely tipped to lose.
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