I posted a nice chart at https://twitter.com/DuncanChapple/status/1416029728516067333/photo/1 from the new issue of People Management. London has around 1 in 7 UK residents and 1 in 6 UK vacancies, as well as 37% of the UK's foreign residents. Many non-UK people rule out schools outside the capital because they either think that all the jobs are in London, or because they prefer to be close to major concentrations of their own community. This is, as far as I can see, a huge arbitrage for people seeking managerial roles in engineering, healthcare, IT, manufacturing sales, the supply chain.
[Edited by Duncan on Jul 16, 2021]