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Not as pricey as Honeywell but you can get a Siemens wireless kit for £60 or so which seem to be reliable. Twenty minutes work for a sparky or ten for a heating engineer.
Had a few issues with Siemens. Massive time delay on switch on for auto setting. Stick with Honeywell or look at Drayton
 
it is low, and needs a top up but its working at the moment!
Press bottom left button and it will tell you water pressure in bar. You might already know but I thought I would tell you anyway. Those gauges are a good guide to filling without power on but not very accurate.
 
so there are 3 things in the pics and its the 3rd one:
1) The receiver - which is connected to the boiler and has light on (part of Binding the Y6630D Wireless Room Thermostat - Honeywell UK Heating Controls)

2) the wireless thermostats- which has the cover lifted off in the first pic. this also came with the link above, y6630D, but is broken.

So i get how those 2 work, if they worked!

3) then i have this, which need to be wired into mains somewhere it sounds, cant take a battery. if the wireless one above in (2) is working would i even need 3? seems a pain to find somewhere to wire in that has electric in wall anyway?
https://www.NoLinkingToThis/p/honeywell-t6360b-1036-room-thermostat/26159

3 is not needed it was probaly wired to where the receiver is now, you need to decide whether to get a new RF stat or see if you can get the old one to bind with its base station, the base station/receiver needs to be secured to the wall. you could replace like for like, or go for a wireless prgammable room thermostat https://theevohomeshop.co.uk/honeyw...programmable-room-thermostat-cmt921a1042.html
 

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