Arthur replied
@FWD2016, I agree, child theme's are the way to go even if, as I did, you do not anticipate making any changes. In this case, I need to add email software integration to track e-commerce, and there will be other situations too.
Still, the customiser import/export works nicely so it's not the end of the world if you did as I did!
All back to normal with the new child theme so I can do that integration now.
Cheers