As I understand you can generate Voronoi polygons in QGIS (2.18.2) using the following approaches;
- Vector menu / Geometry tools /
- MMGIS plugin in
I also read here that you could use SAGA as well. I'm trying to create a shapefile of the UK postcode units using the Voronoi method as discussed here and wanted to understand what the difference was between the different algorithms given that I'll be running it across ~1.7 million points.