Hi,
macOS updates do not seem to be working on Virgin Media.
If you try and update via system preferences you will see this:

If you try and do it from the command line you will see this:

I have confirmed the same issue with 3 other Virgin Media users in my city, and also confirmed with 2 other users on different ISPs that they are not having this issue.
Apparently, error -1012 is related to SSL problems and suggests a man in the middle attack. Has Virgin's anti-piracy filter gone rogue and started blocking Apple updates or something?
How can I escalate this issue?