On the night of June 23, 2016, as the polls closed Britain's Sky News broadcast what sounded like a concession statement from Nigel Farage, the leader of the campaign to leave the EU, plus a YouGov exit poll indicating that the country had voted to remain; over an hour later, Farage reiterated his concession to the Press Association. The combination pushed up the pound on the world's foreign exchanges. A few hours later, when the true result was announced, the pound crashed - but in between a…