Pixellation & picture breakup means you have a fault that's causing poor TV signal. If this is a known issue, it should be listed on the status line 0800 5610061. If nothing's reported....
If you can identify any specific channels (including SD/HD) that are affected, this may help narrow down the fault - but the end result will be that you need to call Virgin to report your fault.
150 from a VM landline, or 0345 4541111 from any other phone, and follow the options for "I have a fault with my TV service"
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