By Paul Donald The Queen is set to take a break in the sun after having to head up royal duties following her husband’s cancer diagnosis last month. Camilla, 76, is reportedly taking a break from official duties and jetting off on a private flight tomorrow for a sunshine break overseas, sources claim. Camilla was the last key royal standing last week — as even Prince Andrew returned to the spotlight for a gathering at Windsor. Royal expert Ingrid Seward last night said: “This will raise the question of who’s in charge at such a vital time and with so many key royals out of action.” The Queen’s…