I spoke to the MOD security guy today about a visit to Eastriggs and he said to write in. If possible I'll arrange for a small group visit, if anyone else is interested. We would need to be security-cleared. This was the case with the Porton Down visit a few years ago, and probably also RAF Alconbury.
Quite an interesting site - it has its own narrow-gauge railway hence is apparently sometimes visited by other anorakists. Fingers crossed, it might just work .... PM me if you'd like to go on the Hopefuls list.
Rob