Now would be an apposite time to mention this 1965 film, made by the BBC. It was one of their first drama-documentaries, and depicted a nuclear attack on the UK, when a small (one megaton) bomb exploded over Rochester in Kent.
The film was deemed too scary to broadcast at the time, and so it was shelved until, at least, I think, the early 80s. You can now watch it on YouTube and elsewhere.
For all those people egging on NATO from the comfort of their armchairs and laptops, I'd suggest a good look at this film. Even a 'minor' attack on the UK would entirely devastate the country, not just from the immediate blast and fallout, but from the mass panic that would ensue and the likely and immediate collapse ot the economy as well as law and order in general.
We are not, as a people, equipped to deal with this. We get anxious when the internet goes down or there are queues for petrol. Even if you escaped any direct attack by living in the mountains of Wales or Scotland, the collapse of civilised society as we know it is not something any of us want to contemplate.