This report is from this week's CNBC's UK Exchange newsletter. Like what you see? You can subscribe here. British diplomats have long prided themselves on the so-called "special relationship" with the United States. The phrase was coined by Winston Churchill, Britain's inspirational wartime leader, when in March 1946 he famously described how an "iron curtain" had descended across Europe. His speech was delivered at Westminster College in Fulton, Missouri, home state of the then-U.S. president