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My hope is that the next government (whatever colour) may leave the current structure alone because, by then, cars like the band K IS200/300 will be 4 - 10 years old. As such they could be seen as owned by drivers who can't afford newer cars. To victimise them would be seen as unjust.
A bit off topic here and a bit of a rant too.
I think you might be a tad optimistic. Future Governments may well continue to unfairly target owners of cars with high emissions because they can. After all, they do now regardless of whether it is properly justified or not, backed by apparent, although completely spurious "Green" credentials. Even if the extra carbon footprint of manufacturing a new car compared with putting up with higher emissions on an existing one is disregarded; current graduated VED does not even remotely reflect a car's actual carbon output. As just one (maybe extreme) instance, my ISF pollutes at a mighty 270gm/km - but I bought it knowing I was going to do low mileage, a result of which is very much less carbon actually deposited in a year than for the averagely-used zero VED rated car - with £405 VED for the privilege. I am fully resigned to this and for it to keep disproportionately increasing "to protect our planet". The top end VED is really based purely on the idea that if you can still afford to buy or run a big-engined car; then you can afford higher VED - and if you buy new, you can afford the extra punitive new-sale tax imposed from 2008 on "polluting" cars. This doesn't "protect our planet"; it just makes it more expensive to live on it.
Can you see any Government giving up a source of extra income whether it is justly extracted or not? A fairer, simpler and cheaper to collect tax on fuel won't happen either - last time Government proposed this in the '70s; they cunningly suggested a rate that turned out to recover nearly three times as much as the Tax Disk, so the idea fizzled out when this was spotted, with an official excuse that the Tax Disk was needed to demonstrate an MOT (or lack of it). Most people could think of a way!
We have to remember though, that if unfair taxes were sorted out, fair taxes would increase to maintain the take