Well I've had to make a new account due to forgetting all my details!
Anyway 12z ECM very intreresting as it give us a decent amount of snow on Friday but the big worry is that we are also on the edge of quite a dangerous section of freezing rain overnight Thursday-Friday.
Most models also do bringup quite a widespread area of light snow during Thursday, the GFS is just about the only model that does not at it puts the LP too far west for it intially. Main risk zone for Thursday is for the west of the area, hence why the amber extends into Hampshire/Surrey and W.Sussex. Not to say there won't be snow east of there, but probably less.
After maybe some freezing rain we move into a band of snow. Some disagreements on timings though strong agreements about the strength and motion of the front so unless something different happens, I'd expect some decent falls of snow on Friday morning into the afternoon,though amounts are still uncertain depending on the northward extent of the front.