Surprised it has not happened before. It is quite easy to line up on the taxiway. It invites you by its more prominent visual cues. Much brighter than the runway. Also not conventional as it is further from the terminal than the main runway. Before you all start bleating about the ILS it is turned off from time to time.
Maybe a little mention on the charts would help to educate folk. My guess that will be the outcome.
Wonder if the nice people in MAN atc record all the mistaken taxying that goes on at that airport......or will 'something' have to happen.....