The Duchess of Cambridge was honored. On the eighth anniversary of his marriage to Prince William, his Queen Elizabeth II. received the highest royal rank, honorary title of the Great Lady of the Cross (Lady Great Cross) to the Council of the British Empire.
This title is always passed by the Queen in person. Kate probably recognized him for his work as a member of the royal family. When she officially becomes the Grand Lady, I will be named GCVO, as the Duchess of Cornwall, Camilla, Princess Anne, Countess of Wessex Sophia and Duchess of Gloucester Birgitte.
The Great Lady was founded in 1896 by Queen Victoria as an opportunity to reward members of the royal family for their individual work in the monarchy.