Pd-Fe compounds are of interest due to the unusual interplay between magnetic and mechanical properties that are observable. Examples include martensitic transformations in Fe-rich alloys, showing shape-memory effects, and more recently the pressure induced `Invar behaviour' of Pd-rich alloys. Pd3Fe is a ferromagnet at ambient conditions (Tc = 540K). Previous work has shown that a large cell-volume collapse occurs at 10GPa, with a loss of magnetic order. At this pressure the sample then displayed almost zero thermal expansion up to 550K. From subsequent simulations and inelastic studies, it is not clear whether the sample becomes magnetically spin-disordered or geometrically frustrated (non-collinear).This study proposes a 3 day single-crystal neutron diffraction study on WISH in order to characterise the magnetic structure of the sample in this high pressure phase.