The general election on June 8 may not be a walkover for Theresa May if the latest opinion poll is the start of a trend.
The YouGov poll for The Times puts the Tories down three points from last week at 45%, while Labour is up four points at 29%.
The Lib Dems were on 10%, down two points, while support for Ukip rose by the same margin to 7%.
YouGov interviewed 1,590 UK adults on Tuesday and Wednesday this week for the survey.
After Foreign Secretary Boris Johnson called Jeremy Corbyn a 'mugmump', the Labour leader said: "We are eight days into the election campaign and the Tories have reduced to personal name-calling. I've never been involved in that and never will be.
"We're in this election because we have a serious debate to be held on all the issues facing this country."
Earlier, in an exclusive interview with HuffPost UK, Labour's John Healey explained how his party would solve Britain's toxic housing crisis.