Just spotted this as being due to publish in Autumn this year:
Life after Nuclear War. Britain's secret plans to survive World War Three
https://www.helion.co.uk/military-histo ... 6218ffdb6c
Obviously, I can't actually recommend it, since it's not published yet, but it might be useful as a resource for working out what less-devastated areas look like, what still works, etc.
So one to look out for, maybe.