Chuffed and flushed with success I tried the new websites and yes typing http://two.drifters-co.uk into Chrome automatically presents the home page as secure HTTPS. All the sub-domains work too.

The article that lead me to SSL informed me that Opera had a built-in VPN. So I tend to use Opera for much of my browsing now. I tried http://two-drifters.co.uk in Opera and, shock, horror Opera deemed it insecure

Opera checks HTTPS pages to ensure that no internal links are HTTP. Of course, my home page had all my sub-domain links as HTTP relying on the server to redirect to HTTPS. I changed these but still the site was deemed insecure. A little further investigation of the source and there are a couple of links to Cloudflare and Google Fonts that also need changing to HTTPS (because I'm sure Cloudflare and Google will support it) and, at last ...

Opera is Happy.