Money talks: Brexit and the City

London is home to the world's biggest international financial centre. But Brexit threatens to cut the City off from its most important single foreign market. Tamzin Booth, The Economist's Britain business editor, investigates whether the City of London can survive Brexit and how other cities across Europe, like Frankfurt, are vying to win their rival's business. What is at stake on both sides of the Channel, and are there any winners in this battle?