@japitts Yes I am having problems with the picture quality however I don't need a new thread starting as I was only commenting on the other post to advise that it is not just a problem with their display.
DanMck commented that he was having the same issue so it's not a single user with issues. You have also commented on a couple of other posts by other people with the same issue but on different channels (BBC4 HD, BT Sports).
This is from Channel 5HD but the issue is the same on some other channels and is more evident on HD channels. The issue has only started for me today.
The other user you've referenced would ideally have started their own thread rather than adding to someone else's, the video you've helpfully posted has all the hallmarks of a pixellation fault.
Pixellation issues such as this are - in the vast majority of cases - caused by signal issues on your individual equipment or installation. If one single reboot doesn't rectify this, then you have a fault that will need further investigation by VM.
Edit: You've mentioned this is happening on "some other channels" - can you be more specific? There may be some commonality without your realising. Digital TV channels are broadcast in clusters which don't always match their EPG positions, and a fault affecting one will usually affect all the channels on that multiplex.
I've posted similar advice on many threads because the same advice applies to each. Poor signal on digital TV tends to cause pixellation issues, and this often occurs downstream of the street cab on your individual equipment or cabling.
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Most channels have now gone back to normal. I am still getting some break up on BT Sport but no where near as much as before. Sometimes a extremely very infrequent break up on other channels (once or twice a day)
Channels that were previously effected were BBC1HD/BBC1, Dave HD/SD, SyFy HD, Sky History HD, Sky One HD/SD E4 HD/SD and Channel 5 HD/SD. When it was effecting both HD and SD versions of a channel, the SD version had a lesser amount of picture break up. There may have been other channels that were effected but I didn't have time to check them all and stuck to ones that I tend to watch..
Virgin have been doing some work on the network in my area recently (Teesside area) and a local FreeView transmitter has suffered fire damage recently but I wouldn't expect that to affect non FreeView channels.