  We discuss the RBC & UKQCD collaboration's progress towards a
first-principles calculation of direct CP-violation in the Standard Model via K
->pi pi decays. In particular we focus upon the calculation of the I=0 channel
amplitude A_0, for which obtaining physical kinematics requires more
sophisticated techniques than those used for the I=2-channel decay. We discuss
our chosen techniques along with preliminary demonstrations of their
application to simpler lattice quantities, and finally discuss our progress in
generating the large-volume, physical-pion-mass ensembles that will be used to
perform the A_0 calculation.
