'The true measure of a society can be found, not just in how it treats its most vulnerable, but in what it asks of its wealthiest members,' say Patriotic Millionaires Marlene Engelhorn and Stefanie Bremer.

This is a 'pivotal moment' in global wealth migration, says Henley & Partners as Britain 'leads the world in millionaire outflow'.

Ranked: Savills' new Dynamic Wealth Indices identify which international cities are doing best at attracting & developing wealth & investment.