I don't think it is going to be eating or heating. But I think it is going to make people stop and think a bit more.
Use summer to build up the extra credit on gas and electric rather thank taking advantage of the cheaper summer bills. People are going to have to be a bit more savvy about energy use around the home.... Do you really need two showers a day? Do you really need a shower each day? Do we really need those vanity lights on around the house?
As for vehicle fuel it's really going to motivate people to change their car use and amount of travel they do. The age of cheap travel is drawing to a close.
An example is my partner has just put our eldest in swimming lessons, with a really good club. But the pool they use at 9am on a Sunday is in the sticks about 12 miles from home with no easy public transport. Perfectly adequate swimming lessons are available less than a mile from home but partner wanted him to go to this. At the moment it's fine we can afford it. I think fuel would have to get to £2.30 a litre for us to even think about an ev and that was at last springs elec prices.
Families running two cars, especially on awful value PCPs will come under scrutiny. We've always had two cars, but recently dropped to one initially as a temp measure after one wasnt worth repairing. We didn't think we'd make it work, but we do, it just means if the one at home wants to go out when the other is out getting the bus. It's a faff, but younger used to it. It's a mindset change.
The local town shops Aldi, Morrisons etc are about a three quarter of a mile walk away. Our neighbours used to scoff at us walking (I maintain its quicker) but now I've noticed they've started to walk too.
My biggest tip... Do a monthly shop (12 a year), then a weekly top up shop at no more than £20. The week before the big shop you eat essentially what's left in the fridge. Meaning little or no waste. We as a family of 4 have spend around £80-100 on the big shop, then £20 on a top up.
The biggest monthly bill we have is council tax (mortgage excluded - but it's catching that up)
Don't get me started on that, but it's gone up from a total bill of about 80% of a months take home pay to about 110% in 9years. Currently £190. Essentially one of us works from 1st Jan to valentine's Day just to pay the council.
Energy is about £70.