Thanks again @michaelk, I assumed that as VW is a 3D programme all the info should have been contained in one file. The file name (P 02) matches with the drawing number for the Ground floor layout, so I'm guessing that the originator has sent a file for the paperspace (as we'd call it in AC) referencing the model as you described. I've gone back to the clieant asking them to source the other files showing the remaining floors. We shall see what happens, still not sure why the originator isn't able to do the conversion though, that's really very confusing!
Thanks again for your help with this. Very kind indeed.
J