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There was a similar problem with narrow boats, where 35 sec gas oil used for both heating the boat and propelling the boat, so the boat owner had to sign to say what parentage when on each.If only your electricity meter could distinguish between household use and car charging.
I note there have been some changes, it seems a generator is now classed as a road vehicle, and you have to use DERV (stands for diesel engine road vehicle) in generators now. So not sure if the narrow boat thing has changed, but there is nothing to stop those with chargers at home from being charged more for their electric.
It seems there is a problem with London's black cabs, they are hybrids, idea was petrol could extend the range, but would run on electric, but the drivers do not use the electric, they are running on petrol instead, taxi's are busy at night, so even if the driver could charge at home, likely he would not be using off-peak, so it seems they can run for an extra hour using petrol, and on public charging stations it is cheaper to use petrol.
