So we're in the process of buying our first house, although its STC at the moment so not definite as yet!
The lounge (which is quite large about 19ft x 11ft) is wall to wall artex. With those large photo wall daydo (sp) frame thingys. We are assuming that it can be skimmed over? Also the artex doesn't stop there it's in the hall & runs up the stairs. Proper artex fetish. So a lot of re- skimming over it to have done. And it goes without saying that the ceiling in the lounge is artex!
Thankfully the bedrooms escaped it!