Re: 50 miles???
"over 70% of the UK housing stock be used to charge an Electric Car. I'm removing those who live in terraces, HMO's, flats or apartment blocks."
So, you've started by removing 70% of the housing stock by removing those who live in terraces, HMO's, flats or apartment blocks, and then assert that 70% of the remainder can can used to charge an electric car. So, that's 20% of the total housing stock.