We had same message. Wouldn't let OH do it as I had set recorder for evening programmes and doing that wipes out recordings. So we were going to do it tomorrow. May have to rethink it now.
The freeview HD channels have been a bag of nails recently here (East Midlands) - I think they must be doing transmitter work as well as burgering around with channel numbering. Glad I've got Sky as a fallback for BBC channels.
I'm not pushing the 'retune' button on my TV until the current ones actually stop working ....
Retuned & got BBC channels, maybe coz I omitted my post code. But no RT news! I enjoyed global weather & news. Are we becoming a dictorship with censored news?