Chilli
I didn't say that the tax from AVGAS paid directly for the system, maybe you didn't read my post propoerly before replying
You need to think outside the scope, sorry I mean the box, for a minute.
It is the tax on AVGAS that helps the government to balance the books and leave AVTUR tax free, that helps the airlines pay the nav charges that pay for the system that the government franchises.
If airliners with big round pistons and turbines competed for business, a clever lawyer would challenge this status quo under the EU legislation that makes discriminatory state aid unlawful, but obviously that is not the case.
So GA users do pay something for the system. Whether it is precisely hypothecated or not is irrelevant,in the same way that National Insurance is collected, but not hypothecated to a pension fund.
Geddit now?