From what I've found these guys are the cheapest for Evohome, I kick myself now as the chap I know could have got me staff discount.
https://theevohomeshop.co.uk/
https://theevohomeshop.co.uk/
My advice, based on experience, is fit a dummy stat and put the real one where no member of the fairer sex can find it.
Might as well wee in the wind as try and explain the concept of a thermostat to my wife. All my friends have the same trouble. Might as well fit a big on/off switch
That was the same with us, until we got the tado kit (don't recommend), and now the Hive (do recommend).We don't even have a thermostat, just thermostatic valves on the radiators.