DIY Smart Home from Scratch

Electric UFH Thermostat - For warming the tiles in bathrooms and drying the floor only, to be controlled with a dedicated smart thermostat with floor temperature sensor. - Moes White ZigBee Smart Thermostat Programmable Temperature Controller For Electric Floor Heating (BHT-002-GBLZBW)

Based on Tuya thermostat with floor water heating actuators It doesn't look like the Moes device works with Hubitat.

This thread HE compatible thermostat for uk offers some good, if somewhat more costly, alternatives. The best option looks to be the Heatmiser NeoStat-e. This definitely supports a floor probe and there is a community integration [Release] Heatmiser Neostat / Neoplug Integration from @cjcharles, though it does introduce yet another hub. The kit and additional thermostat from here are cheaper than most: https://www.vpsunderfloorheating.co.uk/heatmiser-bundles-kits/.

The Salus Quantum units might be cheaper all in as they don't need a hub but it is not clear from the documentation that they are suitable for electric underfloor heating with a floor probe. To be followed up.

Edit:
NeoStat-e with the NeoHub look like the way forward. Interestingly it looks like the ProWarm ProTouch IQ series is a rebrand of the HeatMiser Neo series which could help if we go with ProWarm mats.

The Salus Quantum SQ610RF is Zigbee but does not directly support electric UFH, requiring their Zigbee 16A relay (SR600) and integration through their UGE600 hub. I have asked about standards etc. but their docs are very focussed on using their own hub, app and rules engine, which I have no interest in, and they probably are using a proprietary Zigbee implementation. I'll update when I get a response.