ICM poll of the (former) cabinet's seats
The News of the World meanwhile has an ICM poll carried out in the constituencies of the cabinet (or at least, the constituencies of the cabinet prior to the reshuffle). The News of the World says it covered 18 constituencies represented by 18 "main cabinet ministers", so I'm not quite sure who they've decided was not a "main" Cabinet minister (especially since the article implies that Tessa Jowell, who wasn't then an official member of the cabinet, was included).
The article refers to a 12% swing from Labour to Conservative across these constituencies, but also says the Conservative vote has risen by 20 points and Labour's has fallen 17 points, which would equate to a 18.5% swing. We'll have to wait for the actual newspaper, or ICM's tables, to get a better idea. Either way, it suggests a larger swing in the cabinet's seats than ICM's recent national polls have been showing in the country as a whole.