“She organized when I came home from school to have Cindy Crawford, Christy Turlington and Naomi Campbell waiting at the top of the stairs. I was probably a 12- or 13-year-old boy who had posters of them on his wall,” William said. “I went bright red and didn’t know quite what to say. And sort of fumbled and I think pretty much fell down the stairs on the way up.”

William says he frequently tells his children — Prince George, 4, and Princess Charlotte, 2 — about Diana so she can be a presence in her grandchildren’s lives.

“She’d be a lovely grandmother. She’d absolutely love it, she’d love the children to bits,” he said.