And this brings us back to the point that the public should work around this by putting a community driven database out there to share the real numbers on our properties.
I am sure somebody in the market for a new flat to lease or buy would be willing to spend a few dollars (US) for an app that gives them some numbers without viewing the property and getting out the yardstick. But best would be free of course.
Waiting for the government is no use, so I don't understand why nobody with the right connections comes up with that. Don't tell me everybody is playing the same game, it only takes one guy with access to the right data to get started. And with the right support (media, social networks, etc) it would take of very quick IMHO.