Of course they have identification and, no doubt, would allow one to check their credentials.
We got rid of the telly 15 years, or more ago. License fee was about to go up four quid to £104, IIRC.
Guys turned up one day asking to check for a TV. Wife was loading things into the car and they were blockling the drive. She said go ahead and be quick or move the vehicle as she was in a hurry. They said ‘you look honest enough’ and left without entering the house. We’ve not missed it in that time – plenty of other things to do, than watch carp and repeats on the box!
Saved thousands by now – license, TVs and recorders, running costs and unwasted time in front of a useless piece of furniture blocking up space in the room.
They used to be able to check if a telly was in use when CRTs were in use as they always radiated rf that could be direction-finded. Not so with LCD sets or the even more modern sets. They can, however, now check where anything is imported to internet addresses.
We’ve had regular reminders, to send back, to confirm we do not watch programs. No SAE, so I just post it back in the same envelope with no stamp – the PO have to deliver those replies (eventually).🙂