Ah, got it! (I did say it's been a few years since I trod forum boards ;o))
So the image shows a model (by Alan Fraser @ FormFonts) imported into my Cad program and rendered (quickly!).
The left image is the direct dwg import from SU, the middle and right models show the tinkering with settings from the fbx conversion. As you can see there is some smoothing occuring in the transfer, but not enough to make the model look any good!
Anyone else have any suggestions?
A