In the UK, you need a license to watch TV. The proceeds from the license fee fund the state broadcasting company, the BBC. In order to enforce this, the government sends out TV license inspectors, who go into unlicensed properties to check whether there's a TV present. Of course you don't actually have to let them in; they have no legal power! They are real. I had one visit once. He came in and asked what my TV was. I (truthfully) told him we watched Netflix and Youtube on it, and didn't own a TV box. He left.

They also have TV detector vans, which drive around and detect which houses have television sets.

From Wikipedia

On The Existence—or Non-Existence—of TV Detector Vans

On the one hand TV detector vans don't exist. Wikipedia calls them an "urban legend". It goes on to say that no detector van has ever enforced a TV license fee. This appears to be true. The BBC has never registered a patent on the operating principles of a TV detector van. The principle of detecting a broadcast receiver is itself pretty fraught. How do you detect whether something is absorbing a signal?

On the other hand [...]

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First published:
February 17th, 2026

Source:
https://www.lesswrong.com/posts/ez3qEFgXpu6MifgnY/tv-detector-vans

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Narrated by TYPE III AUDIO.

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“TV Detector Vans” by J Bostock

LessWrong (30+ Karma)