Major update, we have now moved to using OpenStreetMap.org as the data source for postbox and post office location information. Copyright info in main description.

There is a whole new interface to the app that allows you to request data updates from OpenStreetMap within 16km of the centre of the map, you can now use toggles in the top menu to allow you to filter to only see postboxes, post offices or both. There is new clustering functionality in the map interface so that you can better see the information on the map, and a new circular radius overlay that helps you see clearly the area that you are currently viewing postbox data within, since we cannot place all 400,000+ data items on the map at once.