Michael Bettaney's entry on Wikipedia is a bit brief. From memory, yes I am that old, he was relatively young when he was prosecuted. Late thirties/early forties at most. So he may not even be collecting his pension yet. There are bigger fishes to fry I think than him on the death list. If you are interested in British Espionage,
http://en.wikipedia.org/wiki/Christopher_Andrew
This guys work is a good starting point.