ok, quick summary of the forecast as things stand:
Tonight snow showers, some heavy in a line roughly Thames estuary to worthing. Also East Yorkshire down through, norfolk and extending inland
Tuesday - by morning heavy snow around thames estuary, norfolk, and then a big swathe including north wales, across the north of England and into Scotland, especially in the east, but also in central parts. Gently fizzling out I think as we go through the day.
Just as today, other places may well see snow showers too.
Wednesday: main risk areas tend to be through the midlands upwards.
Thursday at some yet to be determined time in the afternoon/evening or night a pulse of heavy snow moves up from the SW. It seems that this may stay quite well west. (I seem to be losing my snow :( )
Friday - it really depends on what happens on Thursday! Frankly I'm getting less confident rather than more confident on this, so I'll come back tomorrow on this one.