Although the details of the arrangements for Mountbatten–Windsor's funeral are unknown, royal experts believe a service would be held at St George's Chapel in Windsor Castle

Royal experts believe Mountbatten–Windsor's funeral would be similar to that of Princess Margaret, who died in 2002 aged 71 after a stroke and cardiac complications. A 400–strong congregation, including 30 royals, attended a private service in St George's Chapel. Flags were flown at half–mast at all royal residences throughout a six–day period of mourning. Ahead of the funeral, the princess's coffin was laid in Kensington Palace, where her family paid their respects. It was draped in Margaret's standard and a spray of white lilies and roses and was then taken to the Queen's Chapel at St James's Palace. The coffin was then driven to Windsor where police had to erect barriers for 3,000 people to watch the cortege enter the castle gates. In a break from royal tradition, which is unlikely to feature in Mountbatten–Windsor's plans, Princess Margaret was later cremated at Slough Crematorium. While not an official state or public occasion, the funeral was a major royal event that was accompanied by a costly policing and security operation. One delicate matter the former Duke may have to ponder in the coming years is who will act as pallbearers during his ceremony. Servicemen from regiments associated with members of the Royal Family normally have the honour of carrying their coffin. Eight sergeants from the Royal Highland Fusiliers, of which Princess Margaret was the colonel–in–chief, carried her coffin.