A lot of British politics makes more sense when you remember how bad median education was until the 1980s/1990s. The post-Joseph/Baker changes are a big part of the age/education story.
Bluntly, the modal young person today - esp in London - are not just more diverse than the modal member of older generations. They’re also genuinely much better educated. We’re going to see this again and again.
If people would like to read more on why the GCSE is a very good exam (despite the recent stupid reforms), I wrote about that here about 900 years ago http://www.bbc.co.uk/news/education-33025782
For the grumpy people in my mentions who believe young people are a disaster, you’ll *really* hate this: we’re all just dumber than our kids. https://en.wikipedia.org/wiki/Flynn_effect
And, finally for this evening: this is basically an artefact from the old world meeting the new. In 1995, the TES ran an editorial justifying saving a bad school in a way that would be unimaginable soon after. https://www.tes.com/news/murder-hackney-downs