The certificate when going to https site is Vigor Draytek. What device is that? Examine yourself the certificate shown (in browser, click the icon in left of address bar). If I ignore the security warning and continue, I end up in Vigor Draytek login page.
Good morning Talenam, Well spotted. Indeed, it was my router not allowing SSL to get through. Although I had changed the router port so it would not collide, it was not working. Having spoken to Draytek this morning about a glitch in their firmware that had been fixed by a firmware update. Anyway, the short story is it's now working. I will give you the heads up on how the DNS was eventually fixed so you will have a record if anyone elts get a similar issue. Once again, many thanks to you all.