I don't have a TV set, yesterday during renovations my office desk with 2 computer screens had been moved to the living room and was at the front window of my home - on screensaver mode no doubt when I left. Meanwhile A TV licence inspector left a card that he/she had called. On the card it said TV set observed? How do I prove to them that it was in fact two computers screens on the desk?
I've drafted a letter of that nature and with a photo of the two computer screens - just the concidence we had moved the screens into the living room bay window as we were putting on new plasterboard! I guess he saw the bright colours and assumed the HP monitor was a TV.