Au4V is an extremely unusual alloy. Neither Au nor V is generally found to carry a magnetic moment in the metallic state, yet the body-centred tetragonal (bct), structurally ordered, form of Au4V is ferromagnetic with a Curie temperature of ~45K. Although possessing many features characteristic of "weak itinerant electron faerromagnets", including a marked sensitivity to atomic environment, other features appear cosnsitent with a spin 1/2 local moment magnet. We propose to carry out a range of zero and longitudinal field MuSR measurements on both Au4V and its fcc atomically disordered, non magnetic, solid solution counterpart Au(100-x)Vx, to study the evolution of spin fluctuations as magnetic order is approached. Comparison of the MuSR spectra with predictions of SCR spin fluctuation theory will elucidate the precise nature of the V moment in this compound.