Quantum spin liquids (QSL) are new and exotic states of matter that in 2 dimensions were proposed by Anderson to underpin the transition to unconventional superconductivity of the high-Tc cuprates. The S=1/2 kagome antiferromagnet (KAFM) is considered the most promising model system for the realisation of 2D QSLs, however experimental realisations are rare. Haydeeite, Cu3Mg(OD)6Cl2, provides a remarkably 2D model S=1/2 KAFM as any Cu/Mg antisite disorder occurs within a 2D triangular lattice. It displays clear characteristics of magnetic frustration: a magnetic transition at T_N=4K involves competing ferro- and antiferro-magnetic components which frustrate eachother. Recent inelastic neutron scattering data shows an antiferromagnetic spin wave below T_N in addition to short-range correlations. We propose to characterise this magnetic structure below T_N using the WISH diffractometer.