ICM show a boost for the Lib Dems

ICM's latest poll for the Guardian has topline figures, with changes from their previous poll a week or so ago, of CON 38%(-1), LAB 29%(-2), LDEM 23%(+4). The poll was conducted on the 30th and 31st March.

There is a significant increase in Liberal Democrat support - the Guardian speculate that this could be because of publicity the Chancellor's debate which is feasible, though I will add my normal caveat about being wary of any movement in a single poll until the trend is picked up elsewhere. According to Julian Glover's report here, the Lib Dem increase is largely down to a big increase in likelihood to vote amongst Lib Dem supporters, which would at least explain why YouGov haven't detected a similar movement in their polls this week.