i*n this city, not a single comprehensive offers Music at A Level. So there's an answer: "the opportunity to study Music to A2".
The same applies, pretty much, for German.
Let's not even start on Latin and Greek.
Further maths is only available in a minority of comprehensive sixth forms*
well, in the comp I was working in yesterday, ( inner city London comp, deprived area) I am not sure in German is offered or not. But certainly German is offered at many Comps. This comp though offer music, Latin, Greek further maths mandarin, Russian etc
( never known a school that doesn't offer further maths)
My Dcs comp offers Music, German, Latin, Arabic, Mandarin, Russian, Further maths, among many other subjests.
Which city doesn't offer music in the state sector?
So no, I don't for one second believe the subjects offered at state school are a smaller range than those offered at private school.
It is also not uncommon at state school for reciprocal arrangements between six forms, allowing for students to have a time table that allows them to attend more than one school, so they have a wider range of subjects to choose from, or combination of subjects if there is a clash between two subjects they wish to take.
Furthermore, Most offer the IB as an alternative anyway.
So, Bolograph, you are absolutly wrong in your assumption on what opportunities the local comps offer. Completely wrong, and many private schools don't offer those subjects anyway.
But thank you at least for making a suggestion, no one else can, it seems