I can't speak for the UK, but with my Model 3 2019 I was charging <10% to 30% @ 250kW (max the car supports) for a good 5+m in Switzerland and Italy already 4 years ago (both at Tesla Superchargers V3 and Ionity 350kW public chargers).

Of course the charger is not the only limiting factor, the grid also needs to support it. If you're in a small town with no big shops/industry, you're way less likely to have 1+MW cables installed, there was never a need for such peak capacity before.