A comment Dave in Essex made got me thinking...Do easterly winds off
of the North Sea sometimes produce snowshowers in the east of England
in places such as Essex and Norwich?

What conditions must exist for this to occur and how much snow
typically falls?

Northwesterly, westerly and southwestly winds during the winter will
cause heavy lake-effect snow to the lee of the Great Lakes in Canada
and the USA. This is a common occurrence in December and January, and
can localized blizzard conditions.

I presume that the dynamics producing snow along the east coast of
England are similar.

Bob