Just a quick heads up on a few devices that seem to be working with my WT system.
However, this is cheaper and may work too, I have bought one but it will not be here until next month so I’ll update you when it comes. Looks the same as the above to me.
A Radiator Thermostat
Its suppose to be the same as this from Danfoss but cheaper
Devolo Home Control Humidity Sensor 9663 https://www.amazon.co.uk/dp/B01BNGGPDU/ref=cm_sw_r_apan_glt_fabc_D84H7WY85F2NEQXKQJJC?_encoding=UTF8&psc=1