Promptly and conscientiously
Am British passport holders and I live in New Zealand at the moment. Do I need a Vietnam visa?
Please be kindly informed that you will not need a visa for Vietnam if you are just staying in Vietnam for no more than 15 days and your arrival date does not fall within 30 days following exit date of your last stay in Vietnam with visa exemption.
Otherwise you will need a visa to Vietnam. And if it is the case, you may have two ways to obtain a visa as follows:
► See full guide here: Vietnam visa for British.
Hopefully this answer fits your question.
Should you need any further information, please feel free to let us know.