SR 71 at Farnborough
JEM60,
The SR 71 did indeed appear at Farnborough, but to the best of my recall, it didn't land there.
I saw it and it was the WOW! of the day. It crossed the Atlantic in about 1 hr 15 minutes and commenced its let down somewhere over Cornwall in the extreme West of England!
Presumably, after its appearance, it will have proceeded on to some US air base that would have had the necessary security and support facilities.
Regards,
BP.