claire - if I understand you correctly basically you think of education purely as a personal luxury - presumably like going down the gym or something? and so don't feel that the state should fund it. But those such as myself who disagree with you would argue that increased educational levels in society benefit not only the educated individual but the wider society. An educated society is a civilised society - not everything we do can be quantified in cash terms - increasing the sum of human knwledge is a good in itself.
You have argued that if you extended the right to a free education beyond 19, where would it end - MAs Phds, etc etc? To put it the other way though, why end at 19 - if it is arbitrary in one direction it is just as arbitrary in another? Why fund education post 16? Or post 14? Why not send children out to work at 11? In other times and other countries any of these were thought quite normal and rational.
In most other Eurpean countries, and indeed in many parts of the UK, education is fully or almost fully funded to degree level - why should English students not be entitled to a free education when Scottish or Dutch ones are?
And why should your neighbour not fund someone else's degre - that way, when he chooses to study, he will be funded - and if he has already benefitted from a university ducation, he has already benefitted frm that funding himself so it is only fair to return the favour. Obviously, he may choose not to use the option - just as some people choose never to visit libraries or doctors or leisure centres - but we still fund them, as social goods. I may never visit Birmingham but am happy if my taxes go towards maintaining their roads and schools and hspitals.
Otherwise, logically, we end up with a system where we only fund things we personally use - tolls on every road, no NHS, no free education system at all...
In fact, we end up totally uncivilised, a kind of banana republic with no essential services.
Your idea of heaven, maybe (and George Osborne's)?
Not mine.