A YouGov poll taken after the Chequers meeting put Jeremy Corbyn’s party on 39 per cent, level with the Tories AFP/GETTY IMAGES

The Conservative Party has lost its lead over Labour for the first time since April and Boris Johnson has dropped down the rankings of who Tory activists regard as good leadership material.

In a poll taken after the Chequers meeting but mostly before David Davis resigned, YouGov put the Tories on 39 per cent, Labour on 39 per cent and the Liberal Democrats on 9 per cent. YouGov interviewed 1,669 adults on Sunday and Monday. Only 18 per cent thought the government was doing well at negotiating Brexit and 66 per cent thought it was doing badly.

Fourteen per cent thought that the Chequers plan was good for Britain, 33 per cent bad and 53 per cent did not know. Twenty-seven per cent said that…