Prince William and his late grandmother, Queen Elizabeth II, reportedly had a “fierce row” once regarding the safety concerns with the future king’s helicopter piloting. The unexpected royal clash was revealed in author Robert Jobson’s new book Catherine, the Princess of Wales: A Biography of the Future Queen. “An experienced pilot, William had upset the late Queen when he defied her request not to pilot his family the 115 miles from Kensington Palace to Anmer Hall, their home in Norfolk,” Jobson wrote. “The Queen, haunted by the 1967 crash that killed the Captain of the Queen’s Flight (althou…