@Brulti, many thanks - I agree with you now that I have seen the release notes and read them as carefully as you did.
I interpret that it is a no-option setting if:
So in summary, if you choose the setting ' outer before inner walls', you get the outside perimeter printed before the hole. If however you choose the standard (?) inner walls then outer walls, this feature doesn't apply.
Much clearer, hopefully this thread will help others too.
Thanks again for your aid.
Simon