Forbidden Planet (not Forbidden Planet International) with shops in Birmingham, Bristol, Cambridge, Coventry, Croydon, Liverpool, London, Newcastle Upon Tyne, Southampton.
And then Orbital Comics in London.
There's also Big Bang Comics in Dublin as well.
That's it for the British Isles – and Europe as a whole.
Given that Local Comic Shop Day is gearing up to be a speculator bonanza, with extremely limited print runs of titles, a sense of exclusivity, stores restricted to sell the comics at a set price, and books being flipped for well above cost price on eBay, participating stores can expect long lines, But in the UK, they could be even longer than elsewhere.
Advice being given for anyone chancing their arm is to go for the Wolverine or the Black Mask Mystery Box. But generally, grab what you can.
I may pop along to the London stores to watch the madness.