Have added our brand new road onto Waze using the map editor but since then someone seems to have labelled the address with the wrong postcode (looks like a simple typo). Causing delivery drivers no end of bother… can anyone let me know how to update it please? Thanks so much 
Post codes are provided by Google, not Waze, has someone put the postcode manually onto your road you created? Can you provide a permalink to the location and let us know the postcode?
Thanks
edit: Is it Byrne Avenue, Church Crookham / Allamand Close / Jubilee Drive etc?
It can take a while for Google to process new postcodes from Royal Mail leaving them unusable in Waze.
You can test this by searching for the postcode on Google Maps, and if it’s missing it will default to the whole of the area for the outward code - i.e. the first part of the code.
In Waze, it will just pick the centre of that area which is less than useful. It is possible to fix this by adding a place for the new code although it’s not clear what will happen when Google finally catches up.