Having received a load of spam I called one of the companies and found out where the details had come from. Not only had the companies paid TwentyCi for leads the information was totally incorrect. Apparently someone I've never heard of and has never (as far as I'm aware) lived at my address, is selling my house and moving in the near future..nope, load of rubbish. If you're looking for a trustworthy source of marketing data, these guys clearly aren't the place to find it