I have a copy of the original single and the song is clearly credited to Coren/Andrews/Cooper. Pic here: http://www.discogs.com/viewimages?release=1548155

GEMA also credits all three. Just type amazin man in the search box here:

http://mgonline.gema.de/werke/

Hope those are DOCUMENTED and OFFICIAL enough for gargoyle.

(even if I am 5 years late on this discussion)