@stephenb you are spot on and that has fixed the issue ! Thanks for persevering and helping clarify the issue. Much appreciated 
As you say, how it was working before is the big mystery and another one of those beautiful troubleshooting things that make our lives more painful/interesting 
Also, I agree on the certs thing. It is one of those techs that is integral to so much, but most of us only have the time to understand it enough to use it and move on.