The pound's flash crash may be a preview of Britain's financial markets as it mulls its Brexit strategy

REUTERS/Phil Noble At 7:07 last Friday in Hong Kong, the British pound suddenly plummeted: In the next two minutes it fell 6.1 percent, to $1.18, its lowest level since 1985. In the next half hour, it regained most of the loss, ending at $1.24 when the clock struck 7:39. A wild ride, you might say, but all’s well that ends well. And you would be wrong. There are two things to know about the pound’s out-of-nowhere “flash crash” at the end of last week. First, British financial markets are...