We can all aspire to get every school in the country to be like fab with millions of GCSE options and extra curricular activities but I suspect it will not actually be financial affordable. Bottom line is, it won't be cost effective.
Maybe instead of grammar schools we can have academic learning hubs, where there are centralised resources to provide extra GCSE options, specialist lectures, access to field experts, trips etc for every school to send their most capable children to spend part of their time at? I don't think the current comprehensive system serves the most academicly able children well, or else surely they will be more state school children in Oxbridge? I think a lot of able children are thriving despite of school and not because of school, and can achieve so much more if the opportunities are there. They should not losing out to the privileged private kids because at their local comp they get a so so education with no way out.