We report on the HPQCD calculation of the u/d hadronic vacuum polarisation (HVP) contribution
to the anomalous magnetic moment of the muon ($a_{\mu}$) from full lattice QCD.
This allows us to obtain a total leading order HVP contribution from $u$, $d$, $s$, $c$ and $b$ quarks.
Our value is $666(6)(12) \times 10^{-10}$ including systematic uncertainties from quark-line
disconnected pieces and QED and isospin effects.
Our result implies a discrepancy between the experimental determination of $a_{\mu}$ and
the Standard model of $3\sigma$.
We discuss prospects for improvements to this calculation underway with the MILC and Fermilab Lattice collaborations.