As ^ but if your income is over £20K+ and/or you have other realisable assets then you will in general be struggling. And also I would say that having to rely on a bursary at such a young age will probably lead you to years and years of uncertainty and stress - why do you need to go to a fee paying school? I'm afraid the reality is that there is a huge chunk of middle income families for whom it is an unrealistic option
We have two bursaries and our income is over 20k There are so many factors taken into consideration. Also the amount awarded varies depending on those factors too. I don't think many schools actually have a set threshold. You just apply and try.