There is no clear picture how the current polar disturbance is going to pan out and the effect of it - certainly some disruption but so far looks like the jet stream is in the wrong place to really let in the cold for the UK even if it did pan out like the SSW event in early 2018. Looks like some potential for colder than usual, but not especially so, weather from it over parts of Canada and to a more limited extent North America but very uncertain as to the outcome for the UK.
So far any significant impact from it has been sitting at the end of the model runs and every couple of days it has shifted on a couple more days so we are effectively not getting any closer to it LOL.