Peter, 47, has been an older brother figure to William, 43, and Harry, 40, since they were all young boys. The son of Princess Anne and the eldest grandchild of the late Queen Elizabeth announced his engagement to Sperling, an NHS nurse, on August 1; no details about their forthcoming wedding were made available at that time.

Prince Harry is said to have offered to share his diary with the Royal Family in a major move that would avoid any clashes of high-profile appearances - and a royal expert has claimed it shows that th