Ok, thanks for your help Jenial. I just figured out what it was, for some reason I had set CATIA into "Small Scale" mode, which doesn't appear to be compatible with Drafting. I have now reset into "Normal Scale" and all appears well.
So in summary completely my fault [upsidedown]
I'm having an odd issue with CATIA. The "view" icons of the drafting bench are deactivated. I'm not sure if I did this myself by changing something in the settings by accident.
Any pointers on how to resolve this would be greatly appreciated!