That low moving up the Irish Sea Friday early Saturday could be an interesting one. Looking at 850 hPa temperatures would misleadingly not signal much chance of snow, but the deep saturated sub-zero vertical profiles in the Arpege and WRF models hint at snow down to low levels away from the eastern coastal counties. The very strong temperature gradient from east to west means that the snowline will be high in the east (east-facing upper slopes there look like geting a pasting), but further west it will come down very quickly, meaning much of the midlands and north could see a lot of snow falling come Saturday morning.
The GFS is not as cold, however, so it remains to be seen exactly how it will pan out. The exact track of the low centre will have a huge bearing on whether this busts or not, but at the moment I would lean more towards snow than not.