WATFORD, ENGLAND - MARCH 31:  (EMBARGOED FOR PUBLICATION IN UK TABLOID NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME. MANDATORY CREDIT PHOTO BY DAVE M. BENETT/GETTY IMAGES REQUIRED)  Fans attends the Grand Opening of the Warner Bros. Studio Tour London: The Making of Harry Potter on March 31, 2012 in Watford, England.  (Photo by Dave M. Benett/Getty Images)