  We report on neutron scattering measurements on the vortex lattice of the
noncentrosymmetric superconductor BiPd. We observe the existence of the
intermediate mixed state, a region where Meissner and vortex lattice phases
coexist, which is a feature of low $\kappa$ Type-II superconductors. Following
this, we obtain an estimate of the value of $\kappa$ using the extended London
model, which confirms the expectation that $\kappa$ should be small. Finally,
we find that the temperature dependence of the vortex lattice form factor fits
well to a model designed to describe singlet-triplet mixing in
non-centrosymmetric superconductors, which may shed light on the question of
the gap structure in BiPd.
