William says walk behind Queen's coffin stirred painful memories
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William, now titled the Prince of Wales, spoke to mourners leaving flowers at the monarch's private Sandringham estate in eastern England, accompanied by his wife Catherine.
Back in 1997, the brothers, then aged 15 ands 12, moved the world by walking behind their late mother Diana's coffin.
"It's one of those moments when you think to yourself: I've prepared myself for this, but I'm not that prepared," William told a group of women supporters, some of them holding flowers.
The royal family traditionally spend Christmas together at Sandringham, with Queen Elizabeth staying on into February.
Receptionist Jane Wells, 54, said she told William "how proud his mother would have been of him, and he said how hard it was yesterday because it brought back memories of his mother's funeral."
Caroline Barwick-Walters, 66, from Wales, said: "He told us how difficult it was yesterday, how it brought back memories of walking behind his mother's coffin."
King Charles III and members of the royal family will again follow the late monarch's coffin on foot before and after her funeral at London's Westminster Abbey on Monday.