Up to a maximum of 250 UPRNs close to AB12 3TU are shown. Note that this is not imply that these UPRNs have the same postcode, merely that they are close to the centroid of AB12 3TU. As addressable objects, they may have other postcodes.
It's important to bear in mind that UPRNs can overlap or stack. For example, a building containing multiple addressable units on different floors, such as a block of flats or a shop with a flat above it, will have a UPRN for each distinct unit. And an open air space, such as a park or square, can also have distinct addressable objects within it such as a kiosk or a structure. Given the limitations of a 2D map, you can't necessarily tell which of several overlapping or adjacent UPRNs is assigned to a specific item on the map. See Limitations of the Data for more detail on this.
See more about AB12 3TU at CheckMyPostcode