DH had many existing EV orders cancelled yesterday by customers even though the charge is not due for several years citing the principle.
This is the problem, though. For most people, a car is an investment, and they need to think and plan ahead several years.
If it were, say, an announcement of a significant new tax on meals out at restaurants starting in 2028, and people reacted by cancelling the table they have booked for next Saturday, that would make no sense; but if you're planning on buying a new car now and maybe keeping it for 10 years, why on earth wouldn't you stop and re-consider whether you still want to go ahead if the majority of that time will now cost you considerably more?
Plus, now the principle is in place, who knows how much it could go up to in the near future? And you'll also have a less attractive prospect for buyers when you come to re-sell your car.