Thanks. I knew about the registry edit, but was apprehensive about telling my son to do that sort f thing, and as he lives 250 miles away it's not something I can do on-site or wish to do remotely.
He has a tablet that Skype's ok so he's happy with that. I was also interested for some people I help and myself.
I'll post on the Windows 10 Forum and see what response I get.
Happily running Windows 10 Pro on both desktop and laptop
We have more and more laws, and less and less enforcement