Snowman.
Quite, and i still don't think its perfection (its good) for bringing cold to uk, i must admit i've come to the conclusion you need a far and wide split with a ridge from Canada to Scandinavia with poleward flux to override everything and guarantee a belter, although didn't 2013 deliver with a wave 1 initial setup? if anyone's got the geop. height charts from 6th -13th Jan 2013 for 10-30mb, i'd like to see them please.