Royal commentator Lady Colin Campbell has claimed that Prince Harry and Meghan Markle "are damaging to the commonwealth" after she released a book that "exposes" the duke and duchess.The book, which hit UK shelves on April 4, is described in its foreword as an "analysis of what happens when a vulnerable male" falls for an "ambitious doyenne".Speaking to GB News, Lady C said: "I thought that it was about time that somebody nailed those two to the…