Thinking about it, and being a total IMBY, as spectacular as these charts are I'd much prefer a straight northerly as opposed to an easterly. I realise that snow can come from any direction once the cold is embedded but unless the Atlantic is active (which it isn't) and repeatedly pushing fronts into the cold block, we run a real risk of Wales being dry but bitterly cold. The reason the model thread has exploded is because it's dominated by people who would be plastered by a rerun of January 1987. Yes, there's a slight amount of jealousy talking here.
There are always exceptions of course. A strong easterly can push snow right across the country like in 1991, and cold, sunny weather is much more preferable to overcast skies and 11C.