Dear Velocity Girl.
I DID check your earlier solution and, believe it or not, I wanted to hold out for a little while longer to see if any more lazy buggers could be bothered getting off their asses and posting a few attempts before I announced the winning answer.
Well, seeing as that probably isn't going to happen now, I have to salute you ONCE AGAIN for getting it
correct. Bloody hell - are you a walking encyclopedia or something - I set three major teasers and each time, it's you who gets the correct answer. This is getting spooky - are you sure you're not a psychic mind-reader or something?
So what you're saying is - each one of the named artists had a huge-selling number one album (well, Pulp's "This Is Hardcore" wasn't exactly mega, but still made the top) only to follow it with a stiff that only made number 6 before promptly vanishing off the face of the earth. Add to that MOTORHEAD'S "No Sleep 'Til Hammersmith" - a number one LP in 1981, this was followed by 1982's "Iron Fist" which only made number 6 and then dropped out of the charts after two months.
Well done you fucking swot!!

How the hell do you do it VG Huh??!! 
(by the way, I haven't forgotten about the Factory single I was going to get to you as the prize for the first teaser I set everybody - we'll have to arrange a way of sorting this out before too long, yeah??
You'll have to arrange somewhere for me to send it, after all this Xmas malarkey is over....)