Via Laban Tall, comes this Daily Mail article which tells us that the government is buying access to the Rightmove homes database from its American owners. At a stroke this gives them access to floorplans and details of property improvements for the majority of houses sold in the last ten years. This of course gives them information which will enable them to "reassess" (ie increase) council tax. Tax implications aside, the real objection is obviously that it's big brother writ large.
The good news is that Rightmove is selling access to the database, rather than the database itself. This means that practical steps can be taken to put pressure on Rightmove.
So get the word out. Don't use any estate agent that is signed up to Rightmove. There's a handy search facility on their website so you know who to avoid.
Of course, this doesn't stop the government from using the information it has access to already. All we can do there is kick the buggers out of power. I propose that polite society starts shunning Labour supporters too. If you support Labour, you support big brother. Your choice. Deal with the consequences.