I finally decided on which smart heating controls to go for a few weeks ago, and opted for the Tado, as it is able to re-use a lot of our existing wiring and is also able to control multiple zones at the same time. The tado sales people were very helpful in confirming that my existing boiler was compatible, and that it could be a direct replacement for my existing controls (with a money back guarantee). However, since placing the order nearly 3 weeks ago, I've heard nothing - it has even been over a week since I sent a support ticket in asking for an update, with no reply. I get the occasional e-mail saying that ticket volume is high and to be patient. I searched online to see how long others have been waiting, and there are people who placed an order in November that still don't have them! Bit of a shame, as it looked like it would have been a perfect fit. There are older versions available to buy online from Screwfix/Amazon etc... but none of the latest versions are in stock. A victim of their own success I wonder?