As it stands most graduates effectively pay a graduate tax for most of their working lives. Exceptions to this are those who do not earn enough, those who pay themselves minimum wage out of their own businesses and those whose parents are wealthy enough to pay fees up front as well as all living costs. A graduate tax would mean everyone who benefits from university education contributes, instead of those on middle incomes paying the most of all.
Yabu - it was better to increase tuition fees
Yanbu - a graduate tax would be a fairer way to fund university study