[arethuza]

Fortunately I don't think things would be quite as bad as at the worst times of the Cold War where there were estimates of ~1000Mt landing on the UK.

If you've seen Threads its worth remembering that the planning exercise it was based on was criticised for being too optimistic:

https://en.wikipedia.org/wiki/Square_Leg

For anyone who has seen Threads to think that what it depicts is optimistic is quite something.