Better 850s at 144 from UKMO and ECM, -8 across a large part of the country and more direct winds from the north. T168 could be interesting, setting up for an eastly perhaps!
EDIT: looking again not quite -8 uppers at 144, more like -6/7
168 is even colder but look like high pressure will be over us come 192, let's see
EDIT part 2: I've seen enough, by 216 it's trying to reload the cold from the east/ North east, few adjustments and it could get there. I think this could still lead to an epic cold spell. Interesting times ahead