The British pound has fallen sharply over the past two weeks – and is now at record lows against the U.S. dollar, losing about 20 percent of its value since Britain’s vote to leave the European Union. Analysts say the realization that Britain could be headed for a so-called "hard Brexit" – likely to involve leaving the European Union’s Single Market – has triggered a major sell-off. But as Henry Ridgwell reports from London, the fall in value is a boon for foreign visitors.