Martin Rowley wrote in news:mAG4r.92446
:

The upper trough is being extended / sharpened as the cold air digs in
to our west, so this surface feature is going to develop a bit more and
slow down - quite a brisk northerly flow developing on its western flank
too ....

My sister is down in Berkhamsted (Herts) today and reports some quite heavy
snow there. I believe that part of the world is relatively high altitude.

Richard