A second one is to make sure all the radiators get hot and if they seem a lot cooler at the top where air settles then they need bleeding. Air locked radiators generate less or sometimes no heat at all but the boiler will still heat the water cycling the radiator.
Be careful as well of the position of the thermostat, we can move ours and use an app to control it so we put it in the lounge as that's where we are 99% of the time. If you can't do this then bare in mind if the thermostat is somewhere like a hall (which is draftier and colder) then the heating might stay on even though you're warm enough in your lounge.
The last one, don't leave your thermostat set to manual to maintain a temperature, use timers! The amount of people I know who just leave it on all the time set to a target temperature. It's not an issue at this time of year as it'll click off because temperatures are warmer but in the winter your heating will likely be constantly on, even when you're not in.