“I’d say there are certain things about this film that are more British – the anarchy, and the specific Britishness of the school is highlighted in a way that hasn’t been previously filmed by a Mexican or American director, and there are nuances … that will be appealing the world over, but are very much British.”

Heyman told Empire “The fourth one is definitely the biggest of the films so far… we have two new schools; it is a mammoth film. We had to build a tank, for example, and Dan had to film underwater for six weeks.”

Meanwhile, the day is fast approaching when Hermione – let’s face it, has to end up snogging Ron. It’s not been written yet, but all the evidence on screen is pointing to it, and the public are practically demanding it. And what is Ms Watson’s take on this?

“I hadn’t actually heard that… I have to say eventually, I think it would be nice if Hermione and Ron ended up together, because they… it’s just got to happen really – that’s my feeling anyway. I don’t know what J.K. Rowling’s got in store for them,” she said, before adding “And that’s the book and the film, not real life!”