They've been doing this for years
As a child (in the 80's) I lived with my grandad
We didn't have a tv-until i was 12 ish and he finally got one (and bought a licence at the same time)
Every bloody friday,they'd show up,demand to be let in,poke about and leave while agreeing we didn't have a tv (its one of my earliest memories)
Rinse and repeat the following friday-and the one after etc
I think I mentioned this to my father (innocently-i was about 8/9 and this was 'normal') and he hit the roof
He wrote a letter,and I have no idea what was said but they never came back
Looking back it was disgusting-they hounded a frail old man and a young child-they certainly made out they had every right to come in and look around and grandad allowed it as we had nothing to hide
It's disgusting that they are still at it!
Pure scare tactics-id ignore them and not answer if they do knock