London —  Prince Harry was back in London on Monday, sitting in the U.K.'s highest court to take part in the third and final of his outstanding legal battles against Britain's tabloid newspapers .  Harry is among the high-profile claimants, along with Sir Elton John and actresses Elizabeth Hurley and Sadie Frost, who have accused the Associated Newspapers group of "unlawful information gathering." The 41-year-old royal, who lives in California, and his fellow celebrities claim the company,