Firefly what about children that want an exceptional school? What do they get? How do they pay for it? What happens to those whose parents cannot or will not fund things for them?
We already have a system where those that want to be able to access excellent schooling can do so by paying - they're called Independent Schools. They're seen as highly divisive, and discouraging of social mobility, and unless your parents grandparents happen to be exceptionally wealthy, or completely penniless, 90% of children have no hope of ever accessing them.
I think a parent in £30k p.a. in many places would not be able to find an extra £500 p.a.- housing cost increases have outstripped salary increases for so long. £30k a year is less than £2000 a month net. Rents in my area (typical city, not London) are £750 for 2 bed. £900 for 3 bed. Doesn't leave much for everything else if you've more than one child.
Spice it's not a 'boost' as in 'oh we'd like to replace the laptops and paint the canteen'. This is to attempt to ameliorate the cuts to schools funding in most of the country, where schools are having to cut teaching staff. But I'm sure it will be fine if there are three classes of forty instead of four classes of thirty, the children will cope fine. 
Perhaps I should campaign to stop funding NHS treatments that I'll never personally get? A well-educated population is important for everyone, childless included. Everyone you work with, that serves you in shops, that maintains your roads, that diagnoses and treats you, that maintains National Security, etc was a child that was educated, 93% of them by the state, paid for by taxes.
It's in your own personal benefit if those people are literate and knowledgeable.