Harry Potter and Nielsen should have created a separate game-show list when "Who Wants to Be a Millionaire?" dominated the ratings. In 1998, Rowling sold the film rights of the first four "Harry Potter" books to Warner Bros. for a reported £1 million ($1,982,900). Rowling demanded the principal cast be kept strictly British, nonetheless allowing for the inclusion of Irish actors such as the late Richard Harris as Dumbledore, and for casting of French and Eastern European actors in "Harry Potter and the Goblet of Fire" where characters from the book are specified as such. After many directors including Steven Spielberg, Terry
Warner Bros. Studio Tour London – The Making of Harry Potter year 2000, Heyday Films leased the site for the "Harry Potter" films. Over the next ten years all of the "Harry Potter" films were made there, along with some other notable Warner Bros. productions, with the series eventually becoming the most successful film series in history. As the eighth and final Harry Potter film was nearing completion, in 2010, Warner Bros. announced their intention to purchase the studio as a permanent European base. By November, Warner Bros. completed its purchase of Leavesden Studios and announced plans to invest more than £100m into the site they had occupied for over ten