The latest opinion poll by Survation conducted today after the Leaders' Question time appearances is the closest yet, putting the gap between the Tories and Labour at 1% - 40% to 39%. This compares to the previous week's Survation poll which put the gap at 43-37%.  A swing of 5% in one week.

Of course we have to be careful about being selective in our choice of polls. A ComRes/Independent/Mirror poll conducted before the Leaders' TV appearances puts the  Tory lead at 12% - the same as their survey the previous week.

The overall trend of polling is unmistakeable, however, and the only question is whether it continues right until polling day - and whether polling day comes too soon for Labour to have a chance of taking the lead.

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