I just registered so I could make this exact post, but figured maybe it is a national issue and not just me so will chime in here...
I'm experiencing the same issue where multiple URLs and applications will not load over the Virgin Media connection - everything from Tidal to Netflix, and even this community pages URL won't open. If I turn on my work VPN (using the same Virgin Media internet connection) then I can browse everything fine.
If I ping the URLs without the VPN they just timeout. However, other random pages like my Gmail and other random pages I find while Googling can work fine (or not! it seems random).
This issue affects any device connected to the Virgin Media connection.
I was previously using a raspberryPi as a piHole while I have now disconnected. I tried switching to both OpenDNS and GoogleDNS and getting the same issue.