YouGov have also released the detailed figures from their weekend poll. The Scottish breakdown paints just a slightly different picture from Populus -
Labour 40% (+1)
SNP 25% (-2)
Conservatives 17% (-4)
Liberal Democrats 13% (+3)
Others 5% (+1)
The figures in brackets are the percentage change from the last comparable YouGov poll. I had to ignore the one carried out for Channel 4, because for some reason it didn't specify how much of the 'others' vote in Scotland was for the SNP.
Usual disclaimer - the margins of error for these sub-samples are typically enormous (anything from 7-12%), and even that assumes that the figures were properly weighted, which is often not the case.