I remember Marie Slocombe in her last years at the Beeb - Sound Archives at that time was just around the corner from where I worked - and a lovely lady she was. The basement was a treasure trove of recordings which some BBC staff, if they asked nicely and without too much talk about it, could borrow and listen to at home. I found a clutch of old Goon Shows which, at that time were not yet publicly available for purchase. There was also a "top secret" tape of part of an interview with Harold Wilson which was cut from broadcast. He threatened to sue the BBC if the contents were leaked. They were not leaked to the press as I recall, but there were certainly copies of the tape doing the rounds! It was innocuous by today's standards - questions to Wilson as to what he intended to do with money accruing from his future memoirs - but he certainly got the hump.