Soldato
You'd need smart meters to enforce it though, or people will just lie about units.
Some houses can't get smart meters, I read some people in flats struggle to get them as not always allowed.
It's a good solution if it's properly scoped, and I'd support the idea of it, but in practice it has a lot of challenges.
It needs a load of variables to be "fair".
I bet most of the people who think a fixed amount at x price (cheap) and the rest are more are relatively low usage and highly correlated to single people
I also suspect most are probably young/middle age, and healthy males.
IE the group who historically have low usage, don't feel the cold as much, and wont have kids or partners nagging at being cold, or expensive bills from medical equipment etc
Tbh I haven't come across a single person lately not complaining about bills (I suspect there is a group still oblivious and hence quiet) who isn't saying they are reviewing and cutting back.
So I don't see the need to try to get the higher users to be harder hit, they are already harder hit in £ terms.
The very rich aren't going to care in general, but in reality they are probably a tiny fraction of the overall consumption.