Is North Korea Feeling the Heat from China?

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Does Beijing really have economic leverage over Pyongyang? And even if they do, are they willing to use it? Presenter Manuela Saragosa hears from one expert - Professor Stephen Noerper of Columbia University - who has his doubts. Also in the programme, how will Brexit affect the UK's all important financial services sector? Matthew Price reports from a nervous City of London on the banks, insurance companies and fund managers warily eyeing the door. (Picture: A North Korean factory billows smoke near the Yalu river on the Chinese border; Credit: Johannes Eisele/AFP/Getty Images)