Reminder

There is no money for infrastructure, free high education, more hospitals, housing, etc.

"Assuming the £13tn mountain of assets [hidden offshore wealth] earned an average 3% a year for its owners, and governments were able to tax that income at 30% [like in the US, Brazil, India, for example], it would generate a bumper £121bn in revenues – more than rich countries spend on aid to the developing world each year."

That is not a revolutionary solution, but one can see that it makes a significant difference.