Info on UK polling report here. The increase in the Labour vote in two of the polls is basically the same as the Tory and Lib Dem decreases combined. Now it might be that we won votes off both parties. But isn't it more likely that we've won them off the Lib Dems. Or in other words, the decreased Lib Dem vote may well be inflated by tactical voting Tories. If that's the case, and the missing Tory vote has gone largely to the Lib Dems then that suggests a big fall in the LD vote.
Clearly all a bit meaningless till the real result comes in tho.