TA,
Cheers, makes sense.
Stevin,
How the *'@£ did you manage to find
that one?! I've been trying for two years!
Does it say whether Prae Brae was an explosives store or just a lab, by any chance? Either way, a dispersed location would make sense.
I'm guessing that its records for the wartime period would have been declassified by the 1980s too.