Thanks for messaging me, I won't add any more post codes using NZ Post data. Have my previous edits been reverted, or do I have to do that manually?

The traces of these buildings is really accurate, and I was wondering if you might have any tricks/tips for mapping buildings that I could learn from?

Sort of, I used to 'download along way' in JOSM to download the city and then searched and selected everything with the address preset. And then set the city and country of the selected objects to NZ and Christchurch.

It is true that on a different edit when mapping buildings I did add those duplicate addresses. I might look into removing them with JOSM.

In this edit, I only changed anything with an addr:.* tag. I didn't add any addresses. Feel free to remove the duplicates if you want to.

Using two ways with a oneway tag is only advised when there is physical separation between each direction. This parking lot should probably only have just one way for each direction not two ways and not use the oneway tag.
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Published using OSMCha: https://osmcha.org/changesets/115493078

Deleting the bus stops is probably a bad idea as info that was added manually like where there is shelter o a bench will be deleted as well. Merging the GTFS data with the current bus stops is probably a better idea. This could be done via comparing the ref number and merging stops with the same number.

Thanks for your feedback I have removed the spread sidewalks as suggested.