Soldato
I presume you're just being deliberately obtuse, obviously my concern is currently their is no "fuel duty" on EV, this won't continue and their is nothing from the Government to say what the new regime would be
It's going to take a while to replace well over 30 million vehicles, I'm sure they'll think of something by the time it becomes important enough to matter, in the mean time they'll set a date in a few years, where that fuel duty freeze they've been putting off for over a decade is pushed up to help offset the losses, and as you said work it on a pay per mile system which seems much more fair.
Don't miss out paying less tax for once in your life!