So it appears (from the excerpts) in Harry's book, that he discusses his relationship with Caroline Flack.
"Very soon after they papped me and Flack, those photos set off a frenzy. Within hours a mob was camped outside Flack’s parents’ house, and all her friends’ houses, and her grandparents’ house,” Harry recalled in Spare."
I think I saw in a previous post where there was a heated discussion about referring to someone by their surname only. @Serenster gave one of her very rational explanations as to why it might be used and wasn't exactly the insult some people claimed it to be. I see now that her explanation was perfectly correct.