Accordingly, the world of TTD has changed and now the village of Hill is the Drummer-heimat (yes, he changes his past, just like the Party). Sadly, Hill is too small even to merit a single nuclear warhead, although both Berkeley and Oldbury-on-Severn both count, probably.
The closest serious target then, apart from the two nuclear power stations (alright, alright - only one, and even it isn't sorted yet), is Thornbury.
Wikipedia defines Thornbury thus:
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which seems about right.