There was a knock on the door the other night. (we don't have a door bell). The man said that this property did not have a TV licence. In fact not since soon after we left to live on our boat!
I was however able to show him my licence having only just had the address changed. I have had it ever since we left. We originally changed the address to our boat name but that was rejected. Then we used our postal address.
It would seem that only one of our tenants had bothered to have a licence while staying at our property.