Recent replies are getting closer to what I was originally after.
From what I heard they said they had an engine failure....not so sure it was a case of 'choosing' to shut it down - at least from what I could make out.
FAO Ironbutt, while you're most recent reply on here was a good one, the one prior saying this is a discussion about Mayday vs Pan is actually not what I initially asked what so ever when creating the thread. It was in fact something you started by your first reply to this thread, which was completely off topic on first reply.