I couldn't analyse anything about what happens after +192 because it's just really weird... 216 is something I've not seen before at all!
Mind you, at d10 we have -8c uppers touching E Scotland with shortwaves and heavy snow across Scotland and N England- but regardless, it'd be best (for the UK) to summarise the EC as this:
-cool and windy today and tomorrow, some wintry shrs on high ground (mostly above 500m)
-turning milder by Monday, up until around the 23rd; with cloudy and warmer conditions likely to prevail
-turning colder by Wednesday, especially in Scotland and the northern areas, with wintry shrs from first the NW, turning to the N by Christmas Day itself, perhaps some snow shrs moving to lower levels at times, but mostly dry and sunny
-by Boxing Day, it turns milder again from the W; and on the 27th a transient blowtorch SWly comes into play with high pressure nearby
for the love of sanity I couldn't go further as NE England goes from +5c 850s at 216 to -7c 850s at 240; but I think it's definitely all to play for, and it's fair to say the ECM op will again be a milder outlier between D7 and D9... for me the points of interest are too varied to pinpoint an exact problem- shortwaves, Euro heights, Icelandic lows, Greenlandic heights etc... but I'm very wary of the 12z ECM, and that's not just because it doesn't set in the deeper potent cold that other models suggest... but the evolution after Christmas is just weird