Demand for residential properties in London far exceeds what the role of capital of the United Kingdom would explain.
London is the heart and "capital" of the Commonwealth of Nations, mostly former British Empire, which includes 54 member states and 2 billion people. An economic area of the size of Europe, but much more densely populated and with an explosive 9% GDP growth rate.
London is the center of the English based education system. English is the official language in 53 countries, and only counting these countries 1.4 billion people need to learn it becuase it is official, but not mother tongue.
For all unstable countries, politically and socially, for all the people in these countries who reach economic success, London represents the easiest step towards stability.
London is truly multiethnic: over 50% of its population is not white British and even more so in Central London. There are over 50 ethnic communities with more than 10,000 people and 300 spoken languages.
London is the economic capital of Europe and the economic and financial bridge that links Europe with the rest of the world.
London is the largest, and most prestigious, labour market in Europe where most top professionals want to spend at least part of their working life.

THE LONDON MARKET BENEFITS OF A CONTINUING SUPPLY/DEMAND UNBALANCE, WHICH HAS PUSHED PRICES FOR DECADES.
THIS UNIQUE GROWTH ENGINE CONTINUES POUNDING.