@vilbi quick question
if it's so secret how come you just posted about it
There is a similar museum just outside East London, it gets more publicity from the (London centric) BBC although the collections there aren't as authentic as the Scottish one
A brown background is UK roadsign code for a historical attraction, active MOD installation sign has red border and if not officially named might be signposted "Works Access Only" (its *not* a good idea to explore there unless authorised, at very least there are barriers and sometimes security patrols)
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