Is the thermostat actually working would be my first question. Get a thermometer and compare them. Turn the thermostat down and see if it clicks the heating/boiler off.
Yeah this - my thermostat really flatters me because the comfortable temperature is 17. That’s a calibration issue rather than me being a Scrooge.
@NickCJ started
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Is the thermostat actually working would be my first question. Get a thermometer and compare them. Turn the thermostat down and see if it clicks the heating/boiler off.