Models are still not really in agreement for the more tricky areas. It will be a 'look out of the window' job for many.
If you live around the NE, East Anglia, East Midlands,central midlands, Bedfordshire (and surrounding counties) Snow is pretty much guaranteed and a lot of it in places.
For those in Hampshire - dodgy territory :( Seems to be the dividing line with snow at first but then perhaps turning to rain - the further north you are, the better.
Coastal counties west of Hampshire - pretty much a bust. Further north western counties may see snow before rain sets in.
SE close to the coast - dodgy territory too just dont know which way it will go. Away from the sea, I'd err more on the snow side.
Timing - early afternoon for those away from CS/SE England. Early evening for them.