Prince Harry is reportedly on edge about his upcoming spring trip to Britain due to a possible “serious security risk.” An anonymous source shared: “The prince is expected to return to the U.K. in May; however, Harry’s team wanted the exact date of the appearance to be kept confidential for safety reasons.” The source claimed that Harry has “anxiety” about the trip — which involves a 10th-anniversary celebration for the Invictus Games at St Paul’s Cathedral — due to “regretful” sensitive information he shared in his memoir, Spare. The Duke of Sussex wrote that he killed some 25 Taliban fighter…