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aggi-
Is there a timer on the boiler then? I'm guessing it must be (unless there's none at all), if the thermostat has no switched live (or is it live - I've no idea)
The usual "smart" setup would be a programmer wired into the boiler, which connects wirelessly (or wired) to a thermostat and to some sort of hub / bridge (connected to your router / switch)
NotThamesWater
Do you have a controller / programmer wired in to your boiler?