Hi this is the room thermometer, "Hive Active Heating Thermostat Without Professional Installation - Works with Amazon Alexa" and also you can find the local radiator controller that can be linked with Alexa as well.

You don't want UFH and radiators coming on at the same time, radiators are a quicker response time so if your radiators come on for an hour they will heat the room, if UFH comes on for an hour you would probably not notice the difference, so they need to be timed differently

Yes there are many types like the “hive” As mentioned.
The hive requires a hub many Of them do, please check if it’s compatible for your set up before purchasing search on google for “smart heating” will give you a few options and prices.

For as to combine them with the floor heating yes two of the same thermostats will work, you’d need one for every room really if you want to isolate the control with this setup. (Receiver and stat)

These thermostats are basically “on and off” switches potentially can wire them to a socket and plug in a floor fan.

另一种选择是WiFi地板采暖的刺激。If you have a amazon echo plus it has a built in thermostat sensor and you could just set it to trigger on and off with the ambient room temp. Also can just manually switch it on, normally the under floor heating has pre set temp too so if you just want to switch it on and off this option will be the easiest. You just swap out the fuse spur with a WiFi spur.

I can’t put links on here but have a look on google.

Thanks.

Yes I’ve fitted them before great bit of kit

Hi there,
Yes both nest and hive have these functions. On Alexa and Google can add 3rd party smart thermostats to voice commands :-)