1. Their school systems are the most elitist/unequal in Europe [0] (from this TED talk [1]). There are many things I love about the UK but I can never go back as the school I send my child to now for free would cost £4000-6000 per year of post-tax income in the UK.
2. Because of underpaying teachers (In comparison to Belgium the mid-level art teacher I know gets paid €100/hr) and burying teachers in red-tape there is a significant shortage of teachers. This has led to the ridiculous lottery system they now have for picking schools.
3. The Brexit is going to hit the number of European students hard. Outside of Oxford and Cambridge, most of the top 10 UK Universities are all in London with a huge contingent of European students.
So Universities are going to lose their European influx and the incoming generation of students are going to be poorer.
[0]: https://imgur.com/a/qqKDgMd
[1]: https://www.ted.com/talks/andreas_schleicher_use_data_to_bui...