A film based around the world of competitive maths might not leap out at you at first, but director Morgan Matthews has covered this material before to great effect. X + Y, focusing the International Mathematical Olympiad, is his new film and we spoke with him and the Asa Butterfield about it. We spoke about:

– Making a feature film around a the documentary Morgan had previously made

– Sources of inspiration

– Researching such a difficult role

– Baggage from other projects

– What the International Mathematical Olympiad actually is

– Finding a natural end for the film

X+Y is out in cinemas now – and you can watch our interview with Rafe Spall and Sally Hawkins here, and read our review here.