With only two days to go, the opinion polls are predicting that Labour, despite enjoying a comfortable lead, cannot be certain of another landslide victory.

A MORI survey for today's FT suggests that although the Tories have suffered a large drop in support, some 36 per cent of the electorate could change their minds over how to vote before polling begins.

The poll showed the Tory share of the vote dropping to 29 per cent among those absolutely certain to vote, a five-point fall from a week earlier.

This is the lowest share of the vote MORI has registered for the Tories since October last year.

The survey puts Labour on 39 per cent with the Liberal Democrats on 22 per cent.

A "senior party figure" tells the FT that the Tories face major change if they lose again: "The 2005 campaign is the last gasp of the one-more-heave brigade.

"The language has been too narrow. It has reinforced our support but failed to broaden it. The whole composition of this campaign has been weak."

Meanwhile, a "detailed" ICM poll of key marginals indicates that Labour is right to be worried about its standing in the key battleground seats.

ICM's  data shows that Labour's vote share in 108 key seats where it faces a strong Tory challenge is down from 47 per cent in 2001 to 41 per cent.

The Tories have maintained their share of the vote at around 36 per cent.

ICM's findings suggest that Tony Blair's majority could be cut to below 80. 

The poll also reveals that the Lib Dems have failed to make progress in their 48 key marginal seats, where their share of the vote has fallen from 36 per cent in 2001 to only 32 per cent now.

The Populus tracker poll in the Times has Labour down one point to 41 per cent, the Tories unchanged on 29 points and the Lib Dems stable on 21 per cent.