It's funny because I actually remember the unleaded/leaded transition and petrol stations were stocking it very early on. The equivalent simile here would be if unleaded was going to be made mandatory in a year and basically 3 petrol stations in the UK stocked it.

The govt are going to make these cars mandatory soon. London is the ideal place to do this due to infra + rich people with EVs (more than you might think, far from 'almost nobody'), yet I don't see any street that has charges along it.

My point is that it's not easy. Having to upgrade the grid and dig up tons of roads is simply not easy no matter how much people want it to be.

That wasn't the case in Germany. Unleaded fuel actually was available only in a handful of gas stations until shortly before the transition.