How many English Literature students know of the existence of Aphra Benn?
Are you kidding? She was studied intensively at my state school in the 1990s. The Rover was one of the works I did for GCSE!
How many people managed to get a pass in History exams without learning about the right for female suffrage?
This was studied too. Obviously.
How many people know nothing about the Irish immigrants who built the canals and railways all across the UK?
We had a whole unit on the canals at my middle school, and the fact that many people who worked on the canals were Irish was of course taught.
How many students learn about the Windrush generation and their contribution to post War Britain?
We didn't study any post WW2 history at my schools, but I can guarantee that this is taught anywhere where post-WW2 history is taught. Without exception.
How many of our Welsh, Irish or Scottish students learn anything about their nations' histories?
Have you actually seen what's taught in most Scottish schools? The history syllabus at most CfE schools tends to be so Scottish it routinely inspires complaints from parents who ask for a more balanced and global perspective.
Ireland is a completely different country, and of course the history curriculum there is focused on Ireland.
You seem to be having a strange argument inside your own brain with a fictional school curriculum that doesn't actually exist.