That's a tricky situation, yes... If there was a school that you felt would be good for both your younger two (I assume you don't want to move your eldest at this point?) I wouldn't rule out having a frank talk with them - apparently, many schools (esp. primaries) have more bursary money than applications for it, so you might be surprised. But even finding a suitable school, never mind paying for it if applicable, tends to be hard enough... Otherwise, there is lots of experience here (albeit not much from the UK) both on working with schools to get them to provide what's needed and on enrichment, so keep talking; someone will have BTDT.
