BUBBLE WRAP!
My thermostat is in the hall and would stay on longer than it needs to be as it's colder out there.
I set a 20-minute timer on my phone and manually turn the thermostat up and down. Once there's heat in the radiators in the rooms we use I can turn it off. It goes back on as the room gets cooler again.
I also close the upstairs radiator valves when I come down in the morning. and have another timer on my phone to remind me to go upstairs and turn them up 1.5 hours before bed.
I'm warm in the morning so don't put the heating on until sunset when I can feel the house getting cold. I also close curtains and blinds before it gets dark and open them when it gets light.
This has cut the time my boiler runs for but not my bills due to the rising prices.
If you're WFH and don't want the heating on or the faff of electric throws everywhere, try wearing bubble wrap.
Yes, BUBBLE WRAP but not next to your skin or you'll sweat. I look like the Michelin Man with all my layers but have Raynaud's so my hands and feet are always cold (even in summer).
I first heard about using bubble wrap as a body warmer when I used to ride motorbikes. It kept me warm and kept the wind out.
My partner thinks my money-saving antics are a bit mental but it makes me feel better knowing I'm at least trying. Keeps my step count up, too.