BiFeO3 is a canonical multiferroic material. We know that local (nanoscale) order is crucial in explaining the behaviour of conventional ferroelectrics, and reciprocal space mapping to measure diffuse scattering from a single crystal is the best way of exploring local order. Yet no one has ever mapped the diffuse scattering from BFO, despite the vast number of studies undertaken. By studying the crystal structure of bismuth ferrite in unprecedented detail using SXD, we will better understand how its technologically useful properties arise and how to improve them. Neutrons are ideal because BFO is a magnetically ordered system and the behaviour of the oxygen atoms is crucial.