XBOX LIVE Service
Users may experience difficulties with the following services:
A subset of Virgin Media ISP users will have intermittent issues connecting to Xbox LIVE.
9/25/2012 4:29:24 AM PDT:
If you're having issues connecting to Xbox LIVE and are using the Virgin Media ISP, thank you for being patient and sticking with us while we work out the problem. Rest assured we are still working hard alongside Virgin Media to fix it as quickly as we can. We will continue to update you as new information becomes available.
Its been down all morning

Oh well time to do some work I suppose.