The channels you've quoted are spread across several broadcast multiplexes (or clusters) - there's a couple that share a common frequency, but not many. BBC News HD shares with 4-Seven HD which is perhaps worth a quick check, also Channel 5 HD shares with Sky Sports NFL HD & Sky Sports F1 HD. (None of which you've mentioned)
It might sound basic, but have you tried rebooting your box? Do you have any issues with viewing OnDemand programmes ok? BBC iPlayer is app-based but any other channel is a good test.
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I have tried rebooting three times over the last seven days but the pixilation reappears quickly.
Thanks for mentioning the broadcast multiplexes. It appears my problem is not confined to channels that share a common frequency, as you say. I do not think my package gives me Sky Sports NFL HD or F1 HD, just SS News HD and SS Mix HD the rest are standard quality, so I cannot try those.
On Demand I rarely use and it is slow but it does work. I have just tried it and got an excellent picture.
I'm happy to try any diagnostic, just let me know.
That makes sense. Thanks for the diagnostics Japitts.
I have rung 150 and did not get to speak to a person. I was automatically promised a diagnostic link via text to my mobile phone. I had a similar promise yesterday. Neither have arrived. Not sure what to make of this. Is there a number with real people on the other end I wonder?