Contrary to your point, the article actually addresses that directly: "The RAC data shows that those charging from a slower home charger are paying just £17.87 for the same 188 miles of range."
> my Model Y in the west coast of the USA (an area much more heavily reliant on long road trips and thus fast charging) has received just 27% of its total energy from superchargers. I'd expect British cars to use them even less.
It's quite possible that British vehicle owners don't have as many garages (probably synonymous with the ability to easily and securely charge at home) as owners on the west coast of the U.S.
https://worldofsynonym.com/qa/what-percentage-of-uk-homes-ha...