hborre thankyou so much!
I had been looking in the render settings from the top menu bar and couldn't find what I was looking for. I had no idea of the different options on the render tab.
I still find it harder absorbing e-instruction manuals etc than hard copy ones, otherwise I might have known that.

Daz Studio 4.8 and 4.9beta, Blender 2.78, Sketchup, Poser Pro 2014 Game Dev SR5 on Windows 8 Pro x64. Poser Display Units are inches