They could make a start by clamping down on the 'free' motability car scam.
If you are given a company car and as a result the whole family derives benefit from it, then you have to pay company car tax, submitted to HMRC on the P11D return.
But if you have a free motability car and the whole family again derives (most of) the benefit, then there is no tax to pay. And they tend to come with free parking blue badges as well.