Thank you for your response Jackie. I have a photo which shows the nest clearly but can’t work out how/where to upload it here. It’s about 17cm x 10cm and an inverted mushroom shape like the native paper wasp nest. We did an early morning ant and wasp killing powder application on the nest which does appear to have been effective.
Photo successfully uploaded - thank you. This article about Asian and Australian paper wasps living in New Zealand is somewhat reassuring as it seems the two can live together in harmony and the Asian wasp doesn’t seem to be more problematic for people than their Australian cousins. https://www.nzgeo.com/stories/paper-wasps-guests-or-pests/