Yep, they actually have no power to search your premises (obv). They are, literally, just some guys herded off the street by a dodgy company that get paid a commission to squeeze money out/scare people.

Nonetheless, I have heard of them: forcing entry into people's homes, claiming to have powers of search, claiming to have power to issue fines, claiming to work on behalf of the police and that they can request arrest...it is kind of incredible.

Britain is a very odd place (I say this as a Brit).