I am using a Google Nest and schedules and self-learning have been removed. There seemed to be an issue when the Thermostat was connected to WIFI in that the temp would stay at 16C. Disconnecting the thermostat from the network allowed the temp to get to around 19C, still not enough though.Did Worcester visit? Did they do a heat loss calculation? Do you operate the heating on a timed ON/OFF schedule? Does your disability mean you are house bound?
I am pretty much house bound and the boiler is in the loft along with the Google Hat Link which I think should be located downstairs if I need to get to it.