To be honest, the bemused reaction of Stephin Merritt while being told that a snatch of 6Music had blasted out on Radio 4 probably sums up the event - it's one of those things that happens from time to time. Like the time the newsreader had a "migraine" and abandoned the 7pm bulletin a couple of sentences in between A Bit Of Fry And Laurie and The Archers.
Still, the official explanation of what happened is worth a closer look:
Diana Speed, the Radio 4 announcer on duty at the time of the takeover, apologised on-air for the interruption and has passed me this official account from her log of events:
R4 Network lost for 2'23" when 6MUSIC was transmitted on our six platforms on the Network Switcher. This was due to a mistake in monitoring when the Control Room did the switch for 6MUSIC from Western House to Manchester at 1900 and instead placed 6MUSIC on our output.I was unaware of loss of network because we monitor desk output in Con and that was going out as normal. Apology was made at the end of the programme.
Except... 6Music didn't crash Radio 4 at 7pm - which would have seen the pips and start of the news replaced with the 6Music running order and Marc Riley pretending to be somebody else. But the recording of the crash shows that both programmes were under way. Curious.