There has been a rise in the number of enquiries about certain aerial transmitters causing viewing issues. Across the UK there are numerous pockets of engineering work that involve actual transmitting antenna changes and actual transmitter equipment replacement. The result is either weak signal – that affects viewers outside of the primary service area giving break-up or pixellation – or transmitters are turned off and all viewers served by the transmitter suffer totally blank screens. The CAI recommend that new installations you complete from hereon, come with a warning that engineering work is likely to interrupt viewing and the customers may experience blank screens for an undisclosed time until work is complete.
Transmitter works can be checked online through DigitalUK and BBC - https://cai.org.uk/index.php/contact/engineering-checker.