Our previous boiler didn't have a thermostat, it was just on or off. Most of the time I would just override the timers and if we were all sat in one room we would be
. New boiler has a thermostat on a stand, although I'm still in the habit of having it on manual and flicking it on when needed.
I saw an illustration some time ago showing a home through the ages. In the 50's everyone was in the living room around the fire, progress to current day everyone in different rooms on devices. It's going to be a massive rewind if everyone's huddled in one room again for warmth. We do all seem to congregate in the living room even if we're doing different things devices/reading/tv. I liked to think we enjoyed each others company but maybe subconsciously it's because it's the warmest room
(south facing, big bay).
No excuse not to have a thermostat elsewhere in the house now, it used to be something that needed dedicated wiring out to the hall or up to a bedroom or something so if you didn't have that wiring in place you were a bit stuck.
But now the link between boiler and thermostat can be wireless, there is one "receiver" component that you wire in right underneath the boiler (generally two wires for power and two wires to signal to the boiler to come on, and that wiring is absolutely standard across every boiler and has been for years and years) so is the work of minutes for an electrician to install. Then the second part is the thermostat which runs on batteries, can be mounted on the wall if you want or carried around between rooms if you want, this talks to the receiver wirelessly, and so the boiler comes on off depending on the temperature wherever that wireless thermostat is, i.e. where you spend most of your time.
Doesn't have to be expensive Hive (although I do recommend it!) - your basic wireless thermostat like the above is around £60 from screwfix and probably half that from the plumbers' merchants. Smart thermostats like Hive and Nest and other makes cost more but do the same as the above but add an internet connection to it, which makes it possible to control it from an app, so you can have clever scheduling, or turn it on just before you get home, or off it you went out and forgot.
By being able to make the boiler only come on according to the temperature in the rooms you actually use most, you will recover that £60 for the wireless thermostat and an hour of an electrician's time to fit it, in no time at all.
TRVs on all but one of the radiators also a must, so that you have some control over the temperature in each room rather than just on or off for the whole house, but that is additional cost to buy and fit. Individually they are cheap as chips like the wireless thermostats but a bit more involved to fit if you don't have them on the radiators already,
is economy 7. 
