Pixellated pictures usually mean you have a signal fault. Reboot your box for starters, if that fails then check for area faults on 0800 5610061.
If still no joy, the chances are the fault is only affecting you (or perhaps your immediate neighbours, who also haven't reported it) - call Virgin on 150 (from a VM phone) or 0345 4541111 (from any other phone) and report it.
You are likely to either need an engineer visit or replacement box.
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Hi Japitts. Thanks for the response. I think it'll be a visit, like last time. It seems to be when engineers have been changing or clearing up the local DP boxes. Oddly when I called 150 the auto system asked for my mobile to send a link and then dropped the call. Bit odd. Will try again.