Yes 43% (+2)
No 45% (+1)
UPDATE : When I first put this post up, I thought I'd only have a few minutes to wait before more details appeared on the Herald website (the last few BMG polls have all been commissioned by the Herald), revealing what the numbers with Don't Knows excluded are, whether there are Westminster voting intention numbers, etc, etc. Instead all we've got to prove the poll even exists is a single tweet from the Britain Elects account - which admittedly is normally reliable. It looks like we'll have to wait until the morning for clarity.
As with Survation and Panelbase last night, what's most important about this poll is what it doesn't show. A few weeks ago, there were YouGov and Panelbase polls published close together which both reported that Yes had slipped below the 45% achieved in the 2014 referendum, thus giving the impression that something had genuinely changed. But if that was really the case, you'd have expected yesterday's Survation poll to show Yes slipping below the 47% figure that has been so typical in recent months. You'd certainly have expected BMG to show a drop - and perhaps quite a sharp one - from the heady heights of 48% or 49% recorded in the firm's last two polls. That hasn't happened.
Of the three polls we've seen this weekend, only Panelbase can arguably be reconciled with the "slippage for Yes" narrative. Although the 45% Yes vote in that poll represents a 1% increase, it remains slightly below the recent norm. But even that can potentially be explained away by the rare exclusion of 16 and 17 year olds from the sample.
In short, there is no longer much hard evidence that Yes have suffered any drift at all. The minimal evidence that does exist is pretty much confined to YouGov polls, and it's possible there's a firm-specific explanation for that.
UPDATE II : Having applied a magnifying glass to a screenshot of the Herald front page, I've finally been able to work out what the BMG figures are with Don't Knows excluded...
Should Scotland be an independent country? (BMG)
Yes 49% (+1)
No 51% (-1)
So with Don't Knows included, the Yes vote is up 2%, and with Don't Knows excluded, it's up 1%. Let me just gently observe that this renders the Herald's choice of headline ("Independence support fails to rise") more than a touch bizarre!
* * *
No 53.2% (-0.4)