Interesting thread, but I haven't got time to read it all at the moment.
Two thoughts; has anybody ever noticed how many people. Do try to pretend they are Scottish or Irish ? I think it's flattering .( In our family we say : many were called, few were chosen!) I'll tell you what though, true Scots ( like me ) have got an accent that leaves no doubt as to where you are from.
I would find it interesting to see which other "folkies" were being watched. I know that Hamish Imlach was under surveillance, yet amongst the folkies he was almost a Tory !
Is there any way of finding out, I wonder ? My interest is personal; we grew up firmly believing that our dad ( a folk singer ) was being watched, and the phone was tapped. He was great, though ! If I was in MI5 I would have watched him too !