Why didn't I find in in a search? It was obviously there - maybe I'm not doing it right. I last heard it sung in the 1980's by one Martin Fowles, in the Romford area, but I am sure he sung 30 years, not 13 in the last line? Sounds better to me. I did ask DB about the song when I saw him at a club about 4 years ago, and he told me a student had written it, but couldn't give me the words on the spot.Anyway, thanks to all