Just a word of warning - looks like 29th December has thrown up some transmission errors and some PVRs are being sent the wrong date and time. I'm on Crystal Palace, and when watching any of the HD channels, my PVR thinks the date is Satruday 3rd March. Switching to an SD channel changes back to 29th December. This is therefore a transmitter issue, so will depend where you live if you are getting the issue.
What this means is, if your PVR was left on an HD channel, it will currently think it's Satruday 3rd March, and therefore won't record anything you've got set between now and then - simple fix is to change to an SD channel and it should then work okay (though my Digital Stream seems a bit confused at the moment by it all).
This has been confirmed on another forum as affecting at least a couple of PVRs in this area, so it's not an issue with the Digital Stream, so could theoretically affect any PVR which takes its date and time from the transmissions signal (probably most if not all of them do this). Not sure if it affects Virgin / Sky, but doubt it as I suspect they have their own system for date / time updates.
Am trying to figure out who to complain to so it gets fixed, but thought I'd make a post here to let people know.