Thanks Taxpert, I misread the guidelines to mean that it was exempt only if you were buying a new PPR, but it seems that you're correct. However, it appears that the last 12 months of ownership is also exempt -- not great news in this case!
The reason I'm asking is that I still have the apartment I lived in prior to this one, and I have to sell it shortly. I know you can only have one PPR... I wonder if the same logic applies though (i.e. would I be exempt from the 5 years or so that I lived in the apartment too, for what it's worth?)
Anyway, thanks for your help, at least I have enough to get on with for my current Form 11.