Chris Rokos, founder of Rokos Capital Management, has changed his residence to Greece after paying £330 million in UK taxes last year, underscoring growing concern that Britain is losing wealthy and highly mobile taxpayers. Greece offers qualifying foreign residents a flat annual tax of €100,000 on overseas income, while Italy, Spain, Portugal, Cyprus, Malta, Switzerland, the UAE, Singapore and Hong Kong are also competing for international wealth and talent. Rokos is one of Britain’s most prominent taxpayers, but the shift extends beyond billionaires. Adam, a City finance worker who asked for his real name to be withheld, is moving to Dubai with his family, citing taxes, childcare costs, public services and transport. He said the move could reduce the time needed to repay his mortgage from 20 to 25 years to three to five years. His annual tax bill is about 35 times that of an average worker, while the top 10% of UK income taxpayers provide 58.4% of receipts. The departures follow Britain’s abolition of its non-domiciled tax regime and other changes affecting inheritances, businesses and wealthy residents. Advisers say many non-doms have left or are considering leaving, although provisional HMRC figures showed the non-domiciled population fell only 0.5% to 73,400 in the tax year ended April last year. City professionals and wealth managers warn that the loss of highly productive taxpayers could become a structural problem for public finances, with the full scale of the exodus expected to emerge in later official statistics.