I came into this thread hoping to offer what advice I am permitted to provide. Unfortunately, there are children here who either have no useful input into the thread and give out rubbish information or who just want to argue.
I have had it impressed on me what information I can and cannot give out under threat of arrest. Yes thats not "oh I might lose my job" Yes it IS that serious. Its not a question of fill in a training book and not ever read it, we are talking serious time spent dictating what you can and cannot disclose/do/look at.
I feel so happy for the poster who feels its fine to talk about his families involvement with defence etc, good one. You have now made them either a target for foreign intelligence or at the least a target for losing their jobs. Bravo.