Same issue here -- been happening since Dec 21st early in the afternoon. Constant packet loss, ping spikes and disconnects, and all Virgin do is take you through the standard troubleshooting with no interest in actually helping. Even the forum moderators acknowledge it's an issue, but the service status still says that all is OK.
The upgrade was completely free and no extra monthly charges will incur, but that isn't the issue. The underlying issue still stands, and I still am being kicked off my games. Literally unplayable when 15 minutes (game time) into a game, I get DCed. So stupid.
A follow up is in order.
FYI: United fan living in London, ready for the onslaught. 😉