In reply to VictorM:
Radio edits have been around for a long time, due to, as you say, length of tunes, or swearing etc. That's not what I'm talking about. As an example the guy who stood in for the sadly departed Annie Mac on Radio 1 on Friday, played an 'edit' he'd made for the show, of one of his own tunes. It wasn't shortened, it was a different version, ie a remix.