NEW YORK - JULY 21: British Prime Minister David Cameron signs the visitors book after meeting with UN Sec. General Ban Ki-moon in the UN headquarters on July 21, 2010 in New York City. Mr. Cameron will conclude his two-day visit to the U.S. by conducting meetings with New York City Mayor Bloomberg and UN Sec. General Ban Ki-moon in New York City. (Photo by Oli Scarff/Getty Images)
