As we sit down for a chat with Niall Horan, he fits as much of a biscuit in his mouth as he can and eats it. We’re in a suite at a London hotel, and there are plates of them strategically placed everywhere. It’s shortbread. He peers at the remaining half and says it before we do. “Shortbread is a very Niall Horan biscuit to like, isn’t it? Plain. Buttery.” We proffer “sweet” and “understated” as more flattering alternatives.