A relaxor ferroelectric exhibits a net polarisation only in an applied electric field due to the co-alignment of polar nanoregions. In La3Ni2SbO9 we found the magnetic equivalent to a relaxor ferroelectric in that La3Ni2SbO9 only shows long-range magnetic order when the ferrimagnetic nanoregions are co-aligned in an applied magnetic field. Now we have found two more compounds, La3Ni2NbO9 and La3Ni2TaO9, that could be relaxor ferromagnets. Both appear to contain ferrimagnetic clusters and show no long-range magnetic order in the absence of an applied magnetic field. We propose to collect powder neutron diffraction data on both compounds on WISH in applied fields of 0 kOe, 4 kOe, 20 kOe and 50 kOe at 5K to see if the clusters co-align to give rise to long-range magnetic order and thus confirm that La3Ni2NbO9 and La3Ni2TaO9 are also relaxor ferromagnets.