That's just the SE bias in the model thread. The UK's best shot at one more significant cold spell would be a Greenland High, as shown by the ECM lately, and that usually favours the North and East, as it did in January and November 2010. If the GFS came off however the SE would be favoured for deep cold, but they wouldn't be getting much snow.
Lets keep our fingers crossed that the ECM is right, and the GFS is showing hints that it is trying to bring in a Greenland High at times during the latter stages of the run.