Manori Ravindran International EditorIn one week, Meghan Markle and Prince Harry’s nuclear CBS interview with Oprah Winfrey became a global television event that toppled incendiary presenter Piers Morgan from “Good Morning Britain” and now leaves a sizeable question mark over Sharon Osbourne’s future as a co-host at “The Talk.”But it’s the war of words being played out across the Atlantic that has prompted extensive pearl-clutching from British royal watchers puzzled by U.S.