Earl Charles Spencer is getting divorced. The 60-year-old broadcaster – who is the brother of the late Princess Diana – has split from his third wife Karen Gordon, the Countess of Spencer, after 14 years of marriage amid the strain of writing his harrowing memoir, ‘A Very Private School’, which recounts the physical and sexual abuse he was allegedly subjected to at boarding school. He told the Mail on Sunday newspaper: “It is immensely sad. “I just want to devote myself to all my children, and to my grandchildren, and I wish Karen every happiness in the future.” He also admitted the five years…