What does it take to be a royal nanny?

Prince George began his first royal tour in New Zealand this week, accompanied by both his parents and nanny Maria Teresa Turrion Borrallo. Originally from Spain, Borrallo trained at the prestigious British nanny school Norland College. Louise Heren, the co-author of Nanny in a Book, explains why Norland Nannies are favoured by royals and other upper-crust families.  ...