The REAL challenge is not where to place the chargers, it's where on Earth to get all the extra electricity generation needed, and baseload rather than fickle wind and solar.
As importantly, the current network cannot handle the extra load required.
As for all UK "strategic" planning in the recent decade or two, it's just pie in the sky because it's not a proper plan and it certainly won't be properly executed.
Far more logical would be to use LPG as a fuel, it's available already and existing cars can be easily and cheaply converted to it, we've had it for 3 decades. Then increasingly scale up hydrogen as a fuel, and both to be made available from the existing fueling infrastructure / locations.
Problem solved, and no digging up of Andean salt flats needed, nor kids digging in central African deep pits for rare earth metals to keep Elon's factories busy.