LONDON (Reuters) - Britain's left-wing opposition Labour Party on Wednesday scored its lowest YouGov poll rating since it was voted out of power in 2010, a setback to its morale before an election in which it is hoping to unseat Prime Minister David Cameron's Conservatives.
With less than four months until Britons vote in a national election on May 7, most polls show Labour either slightly ahead of, or neck-and-neck with Cameron's right-leaning Conservatives.
But YouGov's poll of 1,570 adults, carried out on Jan. 19-20 and published on Wednesday, showed 32 percent of voters planned to back the Conservatives, compared to 30 percent for Labour.
That was a drop of two percentage points for Labour from YouGov's last poll earlier this month, which had both parties on 32 percent. It marked Labour's lowest score in a YouGov poll since the last election in 2010.
The Green Party, which has received a publicity boost because of a row between the main parties over whether it should be included in pre-election TV debates, got its highest ever score in a YouGov poll, with 10 percent of the vote. Pollsters have suggested it is taking some of its votes from Labour.
(Reporting by Kylie MacLellan; Editing by Andrew Osborn)