Reading about the energy meter it would seem like your gas meter and electric meter you can't touch it. It is the property of the energy provider.
I see no reason why Hive can't control a motorised valve, and so the heating, however how you would install a motorised valve is not so clear, maybe you can turn off an isolator or freeze the supply, but simply don't know.
If you have TRV heads on the radiators, then I would think that would be easiest and best method to control heating.
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