To your point not sure anyone really knows as there's no accurate sources of data, the ONS says it will take till 2027 to know any impact. As for what type of rich person is leaving (in terms of ones who productively invest in the UK and those whose wealth is non productive for the country) I think there's even less idea what's happening.
Indeed - and the people who produce this report, apparently take their data from a small, unrepresentative sample of people they "think" are millionaires, and look at where they put down as their main work location on LinkedIn.
They also seem either not to understand how samples work, or just don't care if it's accurate (which I suspect is the case*), as they're extrapolating a tiny sample to the whole population, despite the sample being unrepresentative. So, last year they predicted around 9000 net would leave, based on around 0.008% of "millionaires" in their sample changing their work location (about 50 people). Given that 9000 is 1.5% of their estimate of total millionaires, the margin of error would make the figure almost pointless, even if the sample was representative. Yet they admit that they do nothing at all to make it representative - making it not much more accurate than throwing a dart at a board.
It's essentially the good old advertisement dressed up as news. A few decades ago, newspapers would have people who understood this, and would have seen through it. Now we have people who just need to fill pages, and are happy to reprint whatever rubbish they get sent.
EDIT: *I've just listened to an interview with the "researchers", and I was wrong. He genuinely doesn't know how samples work.
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