LONDON, ENGLAND - DECEMBER 18: British Prime Minister David Cameron (R) greets Her Majesty Queen Elizabeth II as she arrives at Number 10 Downing Street to attend the Government's weekly Cabinet meeting on December 18, 2012 in London, England. The Queen's visit to the weekly Cabinet meeting as an observer is the first time a monarch has attended the meeting since Queen Victoria's reign. (Photo by Oli Scarff/Getty Images)
