What the government never mentions is that the tax exemption was originally set at a rolling 25 years old
I seem to remember in discussions at the time that it was originally set as a _date_ with no intention of making it rolling. I recall quotes from the time about peoples MGs never going to be covered, with associated rending of garments, ripping of hair, and gnashing of teeth.
It seems equitable that vehicles should be charged for their consumption/mileage, and that is most easily done through a fuel tax (which is a bit hard to avoid) but that is considered regressive, affecting most those who can afford it least. Also, when did you last see a government give up a tax?
Neil