Is there any music teacher out there who teaches at a state school? I do, and I agree with this article in the Sunday Times www.thesundaytimes.co.uk/sto/news/uk_news/Arts/article469980.ece. There is no way that your child will be able to study music, let alone make proper progress with what's on offer in terms of Music at state secondary schools. I am now teaching in Scotland and we have kids who graduate with a pass in Advanced Higher in Music who cannot even read music - they learnt their pieces by rote. So if you're serious about your kid's music education, better pay up for a private teacher.
I also taught in England, first in a school in Slough, and then in a grammar school in Aylesbury, and what they taught was very different. So in the end I suppose it comes down to the area you live in, As usual.