The more general term I think is bay effect or ocean effect, but I think even when its ocean people still call it lake effect. I'm not quite sure what I have said wrong, frontal systems that deliever snow rarely cover a significant proportion of the country, and when they do its most often on the twilight of a cold spell. Wheras snow showers imported off the north sea can cover nearly all of the country, infact in 1987 I believe basically everywhere got snow on a couple of days apart from the extreme NW of scotland. 

It's still called "lake effect" snow here in the UK, FWIW - it's a recognised term for it.

(I was first aware of the term being used regarding the UK in the 80s following some media reports about 87, which was a classic example of a couple of feet of "lake effect" snow here, but by the 90s its use was widespread on the likes of usw.)

GFS Ens Paint a very Cold picture this morning, 

http://www.meteociel.fr/cartes_obs/gens_display.php?ext=1&x=306&y=141&ville=Londres

Under average temperatures right to the the end.

As usual for some reason,  the 00z operational is not the best run, but the ensemble mean tells the story - and it is a cold one. 

Yes, down here it's a balancing act between low pressure racing in from the NW and a long enough delay to allow colder air to become entrenched over the South.  

It would be  a wasted opportunity were it to be rain down here.

Reasonable agreement in assessment of 00z UKMO and other output for the scope of Mon-Tues evolution but still only broad-brush detail possible. Without describing all the detail, we expect essentially a risk of (perhaps significant) snow Wales/Midlands northwards. Marked uncertainty how long the cold weather lasts before a return to around average temperatures.

In the south I'm seeing this:

In the Midlands:

In the north: