To get an official line from the Spy:
A major outage is affecting video on demand and broadband internet services on Virgin Media's network.
The first reports were posted to the DS forums yesterday evening just before 10pm. The reports were posted from users located in both the ex-NTL and Telewest parts of the Virgin Media network, and indicated that broadband internet and some digital TV components, such as video on demand, were completely inoperable. Some forum members reported only short outages, while others indicated services began to return around 2am; however, across large parts of the former Telewest network, both broadband internet and video on demand continued to be unavailable this morning.
An update on Virgin Media's status page said: "Some customers Nationally may currently be experiencing a loss all Digital & Broadband services. Our engineers are aware of the issue and are working to restore normal service as quickly as possible. Virgin Media apologise for any inconvenience caused."
Digital Spy Report