One of the major themes in solid-state physics is the realisation of exotic types of relativistic electrons which travel at speeds much slower than the speed of light. These electrons live in crystals with very specific structural properties. One such material is the Weyl semi-metal, which was discovered in 2015. Soon after, there were reports of a second type of Weyl semi-metal which forms through a very specific type of magnetic order. The compound EuCuAs is a candidate for this type of Weyl semi-metal. The presence of Weyl electrons in EuCuAs is indicated by ab-initio calculations of the electronic structure, but up to now there is no confirmation that the necessary type of magnetic order is present. We shall use the WISH diffractometer to investigate the magnetic structure of EuCuAs. We aim to establish conclusively whether or not EuCuAs is a Weyl semi-metal.