Alias Data
The Alias File is a supplementary file containing additional data which are not part of official postal addresses, including details that have changed over time, or have been amended by the public and then used. This file is used to identify these elements and cross-reference with the official postal address.
The Alias File holds four types of record: Locality, Thoroughfare, Delivery Point Alias, and County Alias:
- The Locality record - holds short forms, local names, and 'postally-not-required' (PNRL) details.
- The Thoroughfare record - contains replacement street and road names for a given locality, thoroughfare or dependent thoroughfare combination.
- The Delivery Point Alias record - holds additional information at given addresses, such as trading names and building names.
- The County record - holds traditional, administrative and postal county information.
Royal Mail, in their guide to the data products imply that the county alias information was provided when Royal Mail removed the former postal county from the main file.
Read more about this topic: Postcode Address File
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