My guess- London is one crater. The Thames will have flooded anything left standing and it's heavily irradiated.

Snowdonia(northern Wales) won't be as bad due to not much in there apart from mountains which would effectively block quite a lot of radiation, most of that is also farms do survivors wouldn't have as much of a hard time, perhaps better than USA?
Don't really know about Scotland, never been.

Ireland, I pretty much agree with the general opinion of Speculation of Ireland thread.

Yorkshire(north England(where I am)Manchester and Leeds both are big manufacturers for the military and most likely got hit, again-penning hills could block some radiation but mainly destroyed(to be fair, most of the area is one [censored] hole anyways) so no changes really

Opinions?

It was nuked to hell along with the rest of the world. It would have gone through decades of war with the Middle East and Europe, as well as Scotland and Ireland and I guess Whales before the Great War.

The Thames flooding everything after the bombs is very possible. "Heavily Irradiated" I don't agree with, unless London has a bunch of nuclear power plants and nuclear waste depots.

Pretty much nothing but ruins and desolation.
A bit like Glasgow after a Celtic v Rangers match(I kid, I kid)