I'm still in foreign climes, so I haven't been staying on top of the Scottish subsamples from Britain-wide polls. But here's a round-up of the subsamples that have been published since my last update...
ICM: SNP 38%, Labour 27%, Conservatives 23%, Liberal Democrats 6%, Greens 5%, UKIP 2%
YouGov: SNP 36%, Labour 32%, Conservatives 22%, Liberal Democrats 8%, Greens 1%, UKIP 1%
Opinium: SNP 40%, Conservatives 31%, Labour 20%, Greens 6%, UKIP 2%, Liberal Democrats 1%
Ipsos-Mori: SNP 48%, Conservatives 23%, Labour 19%, Liberal Democrats 7%, Greens 1%
Survation: SNP 41%, Labour 23%, Conservatives 23%, Liberal Democrats 12%, UKIP 1%
There are two omissions from that list. I can't find the datasets from the BMG poll, and there was another poll from Survation where there doesn't seem to be any Scottish figures in the datasets. If anyone can fill in those gaps, please let me know.
As far as the five listed above are concerned, obviously there's no consistency on how far the SNP are ahead, or which party is in second place. But it's really striking that the SNP are ahead right across the board, just as they were in the last batch of subsamples. We seem to be getting back to the point where it will be quite unexpected to see a subsample with the SNP behind Labour or the Tories, whereas during the summer it was a fairly frequent sight. This lends some support to my theory that the full-scale Scottish poll from Panelbase (showing an enormous SNP lead) took us by surprise not because the subsamples during the summer had misled us, but because the political weather has since changed, and the SNP have recovered from their post-election mini-wobble. That reality now appears to be showing up in the subsamples, just as it did in that sensational full-scale poll.
The snag with my theory remains the same as before. If the SNP are back to having a substantial lead over Labour, and indeed a bigger one than they had at the local elections in May and the general election in June, why did Labour do so well in the Fortissat and Cardonald by-elections earlier this month? I still can't really offer an answer to that question.