Sub-polls of 100 to 140 Scots are, of course, not reliable on their own but when several say the same thing, they start to add up to evidence of what is happening.
There have been one or two sub-polls suggesting a Labour recovery in Scotland but these have been outliers.
Most recently Deltapoll and YouGov on 24-28 and 29-30 November, with almost identical results, suggest no resurgence for Sarwar’s branch..
Deltapoll has UK Labour at 48%, Scottish Labour at 21% Cons at 14% and SNP at 45%.
YouGov has UK Labour at 48%, Scottish Labour at 22%, Cons at 14% and SNP at 45%.
9 earlier sub-polls tell a similar story with only 2 suggesting a bigger Scottish Labour vote and 2 even putting the SNP up in the mid-50s!