Right, this is what happened, for those who were unable to get all the details at the time.
This "fan" called Mark Johnson was writing a book "An Ideal For Living" about the band, and had begun to piss the band off severely with his questioning, particularly about Ian and his demise. He received an advance on the book, and bought this brand new scooter SMG643Y out of the advance. He turned up at the Tolworth gig on the scooter, and thus became the subject of one of the band's better japes. The roadies winched the scooter up on the tailgate of their lorry, and Rob got this student union bod from the venue to get up on stage and make the announcement that "if anyone owns scooter SMG643Y, please move it, it's causing an obstruction". Needless to say, our man Johnson legged it outside to find his scooter several feet off the ground !
The book eventually surfaced in the summer of 84, and while it is full of inaccuracies, strange Turmelesque text from Paul Morley and far too many personal opinions from the writer to make it all that good, it is still a valuable resource. I rather like the organisation around the live timetable rather than the narrative style of other books. It's a pity it didn't go past December 83, as it completely misses the best parts. It's also fairly typical of the book that it completely undersells Blue Monday and the impact it had even then on popular music culture.