Just to warn everyone, there's a IPSOS-MORI poll for the Evening Standard out tomorrow which the twittersphere is claiming is a "corker". It will have the Tories up at something ridiculous like 38 or 39 as Ben Page from IPSOS-MORI is already proclaiming on twitter that swingback has happened.
Apparently they have form for producing mental polls before elections. In 1987 they produced the infamous maggie wobble poll. It happens quite regularly.