XT Unit Boundaries

£ Price on application


Geopoint XT Unit boundaries produced by Geoplan on behalf of the Ordnance Survey, Geoplan XT Unit Postcode Boundaries are the industry standard for Postcode accuracy and integrity. The product is derived from the Ordnance Survey ADDRESSBASE product, OS Large Scale Vector mapping, and Geoplan Postcode Sector boundaries*. ADDRESSBASE provides the most accurate representation of Unit Postcode geography in Great Britain. Using this product, digital boundaries have been derived for each Unit Postcode.

*Northern Ireland boundaries are derived from Postcode level geography (Geopoint XT) and Geoplan Postcode Sector boundaries.



Source – Ordnance Survey/Geoplan

Recency – Updated quarterly

Geographical Coverage and Accuracy – UK (excluding Postcode Areas IM, GY, JE)

Projection – OSGB, WGS84 and other projections available on request

Available Formats – SHP, TAB, MIF, CSV, TXT and other formats available on request

Layer Type – Boundary Layer

Data Health


Industry standard for Postcode Accuracy and Integrity

Updated quarterly

Derived from ADDRESSBASE, which provides the most accurate representation of Unit Postcode Geography in Great Britain.

License Type


License type- Annual

Update frequency – Quarterly


The most accurate representation of Unit Postcode Geography in Great Britain

Content information

Multiple postcodes in same location

ADDRESSBASE records with the same national grid co-ordinates and different Postcode attributes cannot be tessellated to create polygon boundaries. These records have consequently been represented through the use of square polygons situated over the relevant grid co-ordinates, which hold the relevant Postcode attributes. Each one of these square polygons is attributed with a unique reference, which refers to a look-up table containing the Postcodes associated with that location. This look-up table is provided as a separate file called XX_vstreet_lookup.txt, where XX is the Postcode Area.

Multiple postcodes in same location

Discarded points

Certain Postcode points have not been used in the production of boundaries for this product. An additional file has been included for each Postcode Area called XX_Discard.txt, where XX refers to the Postcode Area. This file contains two fields, one listing the Postcodes discarded, whilst the second lists a brief explanation to indicate the reason why the point was discarded.

Discarded points

How to buy

To purchase one of our data packs, please call one of our account managers on 01423 569538