Yes Malcolm and others who have kindly submitted their extensive World (ly) knowledge on this specific song and their opinions as to the origins (all much appreciated)

As I said it is the inclusion of the ling dong (ring dong) kiro me chorus which is the subject of the query CC2 in DT

Looks as Malcom says, whoever put this to the basic (existing?) song looks as though never noted down where it came from and whether it had an existing similar chorus which was corrupted, or just pinched from another song!

Anybody know any better?

Ray