999 or 666?

Elvis is the 999th UK number 1 single (he also became the 1000th - how boring!).
I wonder what the 666th was - I want it to be Billy Idol...
...but after a bit of research unfortunately I discovered it was Jason Donovan with Any Dream Will Do.

Have found a pop trivia treasure trove (cough) though...
http://www.everyhit.com/1000numberones