I don't think there's been enough positivity spun on IF's comments above. High to the West - Trough over or to the East. This doesn't sound like a West based - NAO at all!
Two other things to decipher:
1) A very firm NO to Bluearmy suggesting a west based - NAO
2) The date of the 28th (The met don't see a snowfest on the 24th,25th,26th or 27th.......) They have however for a while seen a signal for a deeper more prolonged cold spell from the 28th upto +360 hours. Any snow before this date was always a bonus squeezed about by unexpected amplification before then. This is something Tamara has been banging on and on about. It's the post Christmas into first week of January where the colder charts will come from