In chapter four of the ancient Chinese military treatise The Art of War, strategist Sun Tzu sets out his tactical approach: put yourself beyond the possibility of defeat by making no mistakes, and then wait for the enemy to provide the opportunity for your victory.

It appears Chinese banks believe that their moment to descend on London is fast approaching. Over the past two years, several have quietly built up their portfolios of prime office real estate, often close to the Bank of England building in the City of London.