Being a bit picky here but RAF Fairford has never been a permanent BUFF base ie. there has never been an operational B-52 Wing or Squadron permanently allocated to it. Not sure what the correct term is - Forward Operating Base or Location - but we do see BUFFs here when there is a conflict in the Balkans or the Middle East for example.
Was going to say that the only SAC
bombers that have been based in the UK were the B-47 Stratojets however they were on rotation from the US as well, just on a much longer term basis.
U-Tapao in Thailand was another temporary operating location.
There was a Kincheloe AFB in Michigan, perhaps that was renamed?
Technically Edwards might count as they have had the NB
-52B for many years, only just been replaced.