  We report on our on-going study of the lower moments of iso-vector polarised
and unpolarised structure functions, $g_A$ and $\langle x\rangle_{u-d}$,
respectively, and the iso-vector scalar and tensor charge, for $N_f=2$
non-perturbatively improved clover fermions. With pion masses which go down to
about 150 MeV, we investigate finite volume effects and excited state
contributions.
