Pedant Friday, never as popular as Black Friday...
Looking at the BIG picture around heating always helps (wood for the trees to maintain the fuel pun), it's all to do with losses.
In fact just this morning someone in a top floor corner flat at my development with huge windows was moaning about having to have their heating on virtually flat out for very little effective return. We had a chat about secondary glazing, roof insulation, future building regs in light of Grenfell affecting any leaseholder modifications they might want to try etc.
I'm in a different situation, first floor, commercial shop unit underneath with lots of lovely heaters on all day (8.30am until about 6pm), neighbors on both sides and above, windows front and back only.
So I have my fixed wall heaters set very low, they occasionally come on during the day (unless it's baltic outside obviously), and it gets a bit chilly early evening as I lose the benefit of the shop units heat below and the general air temperature drops.
So the plan is to have the oil filled radiator switch on about an hour before I get back (which varies greatly), on a thermostat setting slightly above that of the fixed heaters, leaving it in whatever room I deem the priority each morning. I can then manually adjust the wall heaters thermostats on an individual room basis as needed when I get home.
I want to try and minimise any safety/regs/insurance issues with having a free standing heat source on when I'm not there, which was partly why I chose a portable oil filled radiator in the first place (I've had it about twenty years). Everybody happy now?