There’s two ways to look at the threshold.. fiscal drag, push more people into the bracket blah blah…
Or…
Pressure on manufacturers to reduce prices to stay below thresholds.. blah blah..
A similar thing happened a few years ago, I can’t recall the exact details, may have been the grant that only cars below a certain price qualified for, and guess what, Tesla dropped their price to get below it.
So in this case it’s arguably a good thing to put downward pressure on (list) prices, in other situations like income tax thresholds you might argue differently
My neighbour told me about is solar panels, the FIT was slashed and everyone went “nobody can afford them, it’s already a 7 year payback ”, and guess what, the panels overnight became cheaper and it was still a. roughly 7 year payback. Company car tax is another where the beneficiaries are the leasing companies as much as the employees. If you stuck up BIK the lease companies would magically find a way to bring the net price down to still make it attractive to the punters