After having significant numbers of wasps around my place for the past few weeks I finally found where the nest was on Friday.
Underground behind the neighbours garage.
Wasn't expecting much from the KiwiCare No Wasp powder but followed the instructions and applied it on Saturday evening. Painless process even if it's slightly unnerving to walk that close to an active in ground nest being buzzed constantly. Puffed the powder in as instructed then left it overnight. Checked last night and there's nothing at all moving.
Highly impressed at just how effective it is. The hardest part was finding the nest in the first place.