When YouGov produced its dramatic poll on the eve of the Commons vote on Syria showing that support for air strikes had slumped, the fieldwork was impressively bang up to date. So it's rather frustrating that the follow-up poll is based on fieldwork that is several days out of date, and that partly preceded both the vote itself and Hilary Benn's "better than sex" intervention. However, for what it's worth, as of Wednesday and Thursday the scepticism about military action had reached record levels.
Approve or disapprove of air strikes? (Britain-wide)
Approve 44% (-4)
Disapprove 36% (+5)
Among the Scottish subsample, there was a similar swing in opinion, but as support for air strikes had been lower in the first place, that proved sufficient to push 'Disapprove' into a clear lead -
Approve or disapprove of air strikes? (Scottish subsample)
Approve 39% (-5)
Disapprove 45% (+4)
We were all slightly dubious about the political composition of the Scottish subsample in the previous poll, because it looked like there were a little too many Tory voters and far too many UKIP voters. That probably would have led to opposition to military action being underestimated. No voting intention question was asked in the new poll, so there's no way of knowing whether that problem has repeated itself.
In the case of the Iraq conflict in 2003, public opinion suddenly swung in favour of war in the immediate run-up to the Commons vote, and that support (temporarily) became overwhelming once British military action was actually underway. The first part of that pattern has been clearly broken by this poll, but we'll need polls with later fieldwork to discover whether the second part of the pattern has been broken as well.