I wonder how much absolute error there is between the actual boundary and a Voronoi boundary. While I'm sure there's some massive IV postcode for which it would

I wonder how much absolute error there is between the actual boundary and a Voronoi boundary. While I'm sure there's some massive IV postcode for which it wouldn't work, if most postcodes are tiny, then the fact that you're off by under a kilometre isn't so bad for routing.