No tax means invalid insurance, so if your taxless neighbour were to reverse into you when parking, presenting you with a £500+ repair bill, you would have to pay to have your car fixed out of your own pocket, and then go through the hassle of small claims court for the damage, and if they are a bunch of ****** they wont have any money, which means you wont get your money back.
Have a word with yourself.
See now if that was true, i'd agree, but no tax does not mean no insurance, it means, ummmmm no tax.