Rich people in other countries demand they be required to pay higher taxes more often than you might think. So why doesn't Britain have a Warren Buffett or a Bill Gates, willing to pay a little bit more tax for everybody's benefit?
All such decisions are inherently political. Politicians can come up with a formula based on an objective set of numbers – but which numbers they choose, and what they do with them, will always be a matter of judgement.
The solution to London's housing crisis lies in building on the Home Counties, and we need a pressure group to make that happen. Anyone want to chuck the Campaign for the Promotion of Residential England a few quid?