It is often the case that newcomers manage to find the oldest of many threads on a song, to which they then post information which is available in all the other threads on the subject. Other people, perhaps not noticing the dates that betray the antiquity of the revived thread, then continue the process. This song in particular has been discussed here at great length (see the long list of links above), and with the best will in the world I don't know that it would be terribly productive to go over it all yet again. The myths repeated by earlier contributors have been dealt with elsewhere.

Perhaps Ewan has the right idea; we might devote this thread, since it has been brought back from the dead into a world that has moved on without it, to modern parodies, of which there are probably a fair few.