  The current $3.5\sigma$ discrepancy between experimental and Standard Model
determinations of the anomalous magnetic moment of the muon $a_\mu=(g-2)/2$ can
only be extended to the discovery $5\sigma$ regime through a reduction of both
experimental and theoretical uncertainties. On the theory side, this means a
determination of the hadronic vacuum polarisation (HVP) contribution to better
than 0.5%, a level of precision that demands the inclusion of QCD + QED effects
to properly understand how the behaviour of quarks are modified when their
electric charges are turned on. The QCDSF collaboration has generated an
ensemble of configurations with dynamical QCD and QED fields with the specific
aim of studying flavour breaking effects arising from differences in the quark
masses and charges in physical quantities. Here we study these effects in a
calculation of HVP around the SU(3) symmetric point. Furthermore, by performing
partially-quenched simulations we are able to cover a larger range of quark
masses and charges on these configurations and then fit the results to an SU(3)
flavour breaking expansion. Subsequently, this allows for an extrapolation to
the physical point.
