I saw this story about it. More expensive EVs (over £37k), including Teslas, are not included so the rich will be paying full whack. What it may do is make some cars more affordable to regular folk. Some manufacturers are dropping prices to be included. There are other caveats about how carbon intensive the factories are, so there are lower tiers of subsidy. Details on models covered here.
EV prices have come more into line with oil-burners lately and can be much cheaper to run. It's obviously easier if you have a driveway so you can charge at home. We need alternatives like communal chargers with decent pricing so others can benefit. Someone near us has a groove in the pavement outside their terraced house so they can run a cable. The council is providing those I think. There are also some public chargers in the village.
We've had over 100 years of burning oil for cars and it is time for a change. I expect we import a lot of that oil, but we can make clean(er) electricity here. Companies and governments need to find ways to make it work for everyone.
RE: On the Pros and Cons of the UK's New Electric Vehicle Subsidy