Is this actually illegal though? Or is it just clever exploitation of the rules? Tax avoidance is not the same as evasion.
For example, tax free savings accounts are often mentioned as "avoidance" in this context, to suggest that it's somehow nonsense to criminalise avoidance. But saving money is a reasonable thing lots of people might want to do anyway even if there was no tax advantage.
On the other hand, a scheme in which rich people pay somebody else to pointlessly buy and sell cars at a loss makes no sense - except that they then claimed a large tax discount as second hand car dealers...
One of the cleverest parts of the English scheme is that tax advisers, who sell such schemes to the rich for lots of money, are insulated from any penalty for doing so... As long as they tell the tax authorities how their scheme is supposed to work.