“Uncle Charles [Spencer] was furious. But I wasn’t. I didn’t want Willy to undergo an ordeal like that without me.

“Had the roles been reversed, he’d never have wanted me—indeed, allowed me—to go it alone.”

Harry also spoke about his feelings during the macabre walk alongside their father King Charles, grandfather Prince Philip and their uncle Charles (Diana’s brother).

He explained: “I remember feeling numb.

“I remember clenching my fists. I remember keeping a fraction of Willy always in the corner of my vision and drawing loads of strength from that.

“Most of all I remember the sounds, the clinking bridles and clopping hooves of the six sweaty brown horses, the squeaking wheels of the gun carriage they were hauling.

“(A relic from the First World War, someone said, which seemed right, since Mummy, much as she loved peace, often seemed a soldier, whether she was warring against the paps or Pa.)”