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is it ok to fit new plasterboard over old board and plaster?
No best answer has yet been selected by demo 7. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Might work okay, but why not do it the right way? Strip off the old board and do the job from scratch, then you know it's done properly, and more likely to last too.
It's hardly difficult to strip the old stuff off, and okay it's a bit messy, but it's no big deal. You'll end up with a much better finish, in my opinion.