By Jessica Gibb & Emma Wilson Prince Harry is “permanently in a state of paranoia over The Firm betraying him”, a royal expert has claimed. The Duke of Sussex launched a blistering attack on his estranged family in his explosive memoir Spare, which was released in January last year, and alleged his father’s second wife Camilla Parker Bowles leaked and planted information about him to the press in order to improve her standing in the Royal Family. Harry claimed Charles and Camilla, along with their “spin doctor”, leaked stories about the prince’s visit to a drug rehab centre in 2002 and threw H…