Over in the UK, concerns have been raised over a new kind of brain drain as migration remains a consistent issue.

A total of 257,000 British nationals are now thought to have left the country last year, 180,000 more than the initial estimate of 77,000.

UK correspondent Enda Brady says rich-listers are among the high-profile Britons leaving, including steel magnate Lakshmi Mittal - who voiced displeasure with proposed tax changes.

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