BTEC music or music a-level at a really good school, no fees in london?

I'm looking to move schools next year for sixth form. i play violin as my main instrument along with viola, cello and piano. music is my favorite subject which i have a pion for. i want to take music on as a career so want to go to uni doing music. where can i go that either does music BTEC or has a really good music status, somewhere in London, preferably Kent, and please, no fes! :) thank you!!