Registered just to post that this is fantastic, I'm only doing research at the moment, but this is exactly what I want to do, so thanks for sharing.
A question for the people who've purchased the radiator valves, which ones did you get? I see on the Conrad electronics page there are 3 (http://www.conrad-electronic.co.uk/ce/en/overview/0812043/MAX-Wireless-Heating-Control)
As far as I can see, the 2 non-plus versions offer the same functionality, but are physically different, while the plus version offers something more? What's the differnce between all of these?