It is highly unfortunate that media and successive governments have perpetuated this myth. There is no such thing as "non-dom" in UK tax, since April 2025.
I pull this one out quite a lot when people say ill-thought out things like the above quote (and the OP too!). It's from the West Wing, so v old now, but still relevant:
"Henry, last fall, every time your boss got on the stump and said, “It’s time for the rich to pay their fair share,” I hid under a couch and changed my name. I left Gage Whitney making $400,000 a year, which means I paid 27 times the national average in income tax. I paid my fair share, and the fair share of 26 other people. And I’m happy to, ’cause that’s the only way it’s gonna work. And it’s in my best interest that everybody be able to go to schools and drive on roads. But I don’t get 27 votes on Election Day. The fire department doesn’t come to my house 27 times faster and the water doesn’t come out of my faucet 27 times hotter. The top one percent of wage earners in this country pay for 22 percent of this country. Let’s not call them names while they’re doing it, is all I’m saying"
In the UK the top 1% of earners account for roughly 13% to 15% of all total taxable income in the UK, but they pay 28-30% of all tax, so pay twice their relative share - not just twice as much (they pay many, many more times) than the rest of the UK, but twice as much relative to their income.
Bashing the wealthy might be fun, and you may feel schadenfreude when they get taxed more, but if they leave in vast numbers, the UK is screwed. We are unable to fill the gap they would make without leaving many, many people seriously uncomfortable or worse. The Adam Smith Institute estimated that with a "medium number" of non-doms leaving the impact could be a cumulative loss of up to £32.4bn in lost growth by 2035 and the loss of 28,322 jobs by 2030. You can read the whole report here:
https://www.adamsmith.org/press-releases/abolition-of-non-dom-status-could-cost-up-to-111-billion-by-2035