Please do not write below the line

"Please do not park next to our nondescript White Van" would suite just as much.

They don't use non-descript vans. They want you to know who they are. Now, whether the vans can actually detect anything is a different matter. Some believe they are just a visual deterrent, and don't actually do anything beyond looking scary.

That is my understanding. They certainly had a demonstration device that could deduct a local oscillator, but it is suggested it was just PR.

There is some kind of 'detector' mentioned online that can apparently look at a window and see the light of a TV flickering on the glass! Judges buy this bs and issue warrants to search.

The point is they have as much to gain from encouraging people to believe they actively use "TV scanners" and you can't know when they are about with their vans as saying nothing.

Cynically it gets your auntie talking, brings TV license to front of mind.

It's doubtful they ever actually did such a thing.