Queen Camilla has given a rare insight into King Charles’s health ahead of Trooping the Colour. The Queen, 76, made a surprise appearance at the Queen’s Reading Room Festival on Saturday. During a chat with author Lee Child, Camilla shared an update on her husband King Charles’s health. Queen Camilla joked to Child that King Charles was “doing fine”, but that he “won’t slow down and won’t do what he’s told”. The author quipped back that the King sounded like a “typical husband”. The Queen looked elegant as she arrived for the event, which saw her mingle with several authors, in a sleek navy ju…