We pay £85 for gas and electricity for a two-bed house with 2 adults in it. We need new windows, so it's not cheap to keep it warm. Heating and hot water are both by gas (combi boiler). I'm part-time, so am home 2 all day on 2 weekdays and by 3 every afternoon and I can't bear being cold.
I'm a bit obsessive about wasting energy and get really cross with DP for boiling a kettleful of water to make a cup of coffee. We have a double oven and the big one only gets used when I cook a roast. We don't have a tumble dryer. I hang washing from the picture rails upstairs, it dries quite quickly. I never put the machine on unless there is a full load.
In the last year or two we've had to replace the fridge, freezer and diswasher, and have gone for ones that are A++ enery rated.
Do you use a prepayment (card or key) meter? I've had clients move in to properties where the previous tenant had energy arrears that were being collected through the meter, so that every week they lost £5 or more of the money they put on, because they were paying the previous occupier's arrears. Worth checking that that's not happening.
Although prepayment energy isn't the rip-off it used to be, it does limit how much you can save as a lot of the cheapest energy suppliers don't do prepayment accounts. If you can switch to a credit meter and pay by DD, you can shop around for the best deals and spread the cost of what you use over a full year. That way, you're not shelling out shedloads in the winter.
Check your house for draughts (walk round the house with a lit candle, the flame will show you where the draughts are). Just putting a draught excluder strip round the back door made a big difference in our house. Thermal blinds are a cheap way of reducing heat loss through windows, especially if you put them down when it starts to get dark.
New builds are often surprisingly inefficiently insulated (a whole estate of new HA houses in my area has been found not to meet the prescribed standards and the builders are having to do a lot of work to put it right) and this explains why
www.theguardian.com/money/2019/feb/02/new-build-homes-why-some-owners-are-left-feeling-the-cold .