Waghorn wrote:

as at 21Z looks more like an instant occlusion than anything

Beat me to it ! I was about to post a similar thing based on what I'd
seen earlier today. Quite interesting, but if I'd looked at the 2300
image in isolation, I'd have said it was a cloud head. There's almost a
feature in advance (to the north) of the cold air development that
looks cloud-head esque.

Will be interesting to see if any low of note forms overnight. I'll
tempt fate here and now by saying it'll be a damp squib. Any inland
70mph gusts are now my fault !

Richard