🆕Other Alias
This page details upcoming data that will be provided for the new Other Alias Related Component in the OS NGD Address Theme from early October 2026 to give you early insight. The new related component won't be available via OS Select+Build (the bespoke OS NGD data download service) until early October when data schema version 2.0 of the Royal Mail Address Feature Types is released.
The information on this page is as accurate as possible, but is subject to change before launch.
The Other Alias Component provides alternate names for counties, localities and thoroughfares. County aliases provide alternate names for a county, including Traditional, Administrative and Former Postal County information. Locality aliases include old short-form names, local names and Postally Not Required (PNR) Localities. Thoroughfare Alias information provides replacement Thoroughfare names for a given Locality, Thoroughfare or Dependent Thoroughfare combination.
For more information about components of the Other Alias table, please consult chapter six 'Alias' of the Royal Mail Programmer's Guide.
Other Alias Component for Royal Mail Address Feature Type data schema version 2.0 onward
Customers taking data schema version 2.0 onward of the Royal Mail Address Feature Type in GeoPackage format will receive the following in their data package:
Feature type: Royal Mail Address
Related components: Multiple Residence, Delivery Point Alias and Other Alias
However, the three related components (Multiple Residence, Delivery Point Alias and Other Alias) will only be provided for Royal Mail Address features if the Description attribute is 'Postcode Address File'. Against all other Royal Mail Address features, the related components will be populated as null.
Temporal filtering
The earliest date on which you can request a one-off snapshot of a date in the past for data in this feature type is 08 October 2026.
Any data temporally filtered earlier than the specified earliest date noted above for the data schema version may contain data inconsistencies.
More information about temporal filtering is available from the Getting started with temporal filtering guide.
Related component attributes
The following sub-sections provide details about the attributes included with this related component, their data types in the different output formats, and other important metadata about them.
aliasid
Ordnance Survey derived primary key providing a unique row identifier assigned to enable indexing for efficient querying.
Data Types: String (GPKG), String (CSV)
Nullable: false
Max Length: 36
OS Select+Build Filterable: No
Data Schema Version: 2.0
udprn
Unique Delivery Point Reference Number (UDPRN) assigned by Royal Mail as a persistent identifier, belonging to the feature of which the alias relates to.
Data Types: Integer (GPKG), Integer (CSV)
Nullable: false
OS Select+Build Filterable: No
Data Schema Version: 2.0
featuretypeversiondate
Date of the feature version to which this related component applies. This is used along with the Feature Type ID attribute to join the component to the Royal Mail Address Feature Type.
Data Types: Date (GPKG), Date (CSV)
Nullable: false
OS Select+Build Filterable: No
Data Schema Version: 2.0
alias
Contains alias name text, derived from either Thoroughfare, Locality or County source tables.
Data Types: String (GPKG), String (CSV)
Nullable: false
Max Length: 150
OS Select+Build Filterable: No
Data Schema Version: 2.0
aliasrecordtype
Indicates the source alias table from which the record has been derived.
Data Types: String (GPKG), String (CSV)
Nullable: false
Max Length: 25
OS Select+Build Filterable: No
Data Schema Version: 2.0
aliastype
Indicates the alias subdivision applicable to the record.
Data Types: String (GPKG), String (CSV)
Nullable: false
Max Length: 30
OS Select+Build Filterable: No
Data Schema Version: 2.0
aliascode
Royal Mail raw alias component information, containing concatenated components and codes as a single string attribute.
Data Types: String (GPKG), String (CSV)
Nullable: false
Max Length: 150
OS Select+Build Filterable: No
Data Schema Version: 2.0
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