Boost for Cameron as Tory lead rises to seven points

Tory lead rises three points in wake of British Airways strike.

The Conservatives have increased their lead over Labour, according to a new poll which suggests the British Airways strike may have damaged the government.

The latest YouGov survey for the Sunday Times put the Tories up two points to 38 per cent, with Labour down one point to 31 per cent and the Liberal Democrats down one to 19 per cent. If repeated at a general election on a uniform swing, the latest figures would leave David Cameron 30 seats short of a majority in a hung parliament.

The poll also asked voters whether they approve or disapprove of the three main party leaders. Gordon Brown's approval rating has fallen to -28, down from -24 a fortnight ago, while David Cameron's has risen to +10, up from +4. In a boost for the Liberal Democrats, Nick Clegg's approval rating is at +20, up from +4 two weeks ago.

Meanwhile, a new ICM poll for the News of the World, conducted earlier than the YouGov survey, showed the Conservatives' lead falling to 6 points. The Tories are on 38 per cent, down from 40 per cent a week ago, with Labour up one point to 32 per cent and the Liberal Democrats down one to 19 per cent. If repeated at a general election, the figures would produce a hung parliament with the Tories 39 seats short of a majority.