Much like last summer, King Charles III reportedly only uses Balmoral Castle in Scotland for official entertaining and housing for guests and other visiting senior royals. His Majesty prefers to not sleep in the “drafty,” castle since he already has another lavish residence nearby. The King chooses to primarily stay at Birkhall, a manor house on Balmoral grounds he inherited from his grandmother, Queen Elizabeth the Queen Mother, upon her 2002 death. A source revealed the monarch, who is still battling cancer, stays at his years-long private home with Queen Camilla, where painting and gardenin…