Yes exactly, so unlikely to be cold enough for snow away from high ground. We need sub 520 to get non-marginal snow to lower areas and even with those synoptics we still can't seem to get it cold enough now.

a few members still give some hope for the south for Xmas day, we need that troughing to develop.  But overall it shows again how the power of the northern jet in the modern era buggers things up.  30 years ago I'm sure the high would have set up a few hundred miles further north. 

I think he meant where he lives. Exposed to the north sea.  But even here compared to what we are used to it will be a shock to the system once you lose the humidity, it feel colder than the uppers suggest

That is inaccurate and simplistic.  You have to take into account several factors, as has been explained often enough.  The temperature in the lowest layer of the atmosphere, the nature and intensity of the precipitation.

Low 520s are more than adequate even for relatively low-lying areas.