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Looks like you can replace it with a bog standard thermostat like this
https://www.screwfix.com/p/drayton-rts1-1-channel-wired-room-thermostat/85263or programmable like this
https://www.screwfix.com/p/horstmann-channel-wired-room-thermostat/12157If you want smart then a Netatmo one can be battery powered to work with that kind of setup.
You'd need to check what wires are underneath but most of these things are just a temp sensor and a circuit that turns on / off when the sensor is above / below the set thing.
That means that you should be able to easily swap it out for something metric or smart of whatever.
Post a pic with the cover off.