The debate about the ultra-rich & NonDoms' reactions to tax rises is always shaped by what their advisors (and confidants) say they will do when they are confronted with having to pay a bit more tax.
But, what we seldom, if ever see is the data on how many actually have moved after a tax change.
So here's a report from a previous change to the tax regime for NonDoms that found very little actual relocation; in the end they'd prefer to pay the taxes (quietly) than move!
https://warwick.ac.uk/fac/soc/economics/research/centres/cage/manage/publications/wp630.2022.pdf