AddressBase Core Known Data Issues

This page provides the details of known data issues in the AddressBase Core product. Once resolved, details of a known data issue will be held on the page until the next release of the product.

Live known data issues

Data Issue	Data Issue Description	Last Update
Incorrect GSS code values for address records in Sheffield and Barnsley.	An issue was encountered following the change in GSS codes for Sheffield and Barnsley that took effect on 1 April 2025. This has resulted in AB Core currently displaying the historic GSS code. The previous and current GSS code changes as of 1 April 2025 are detailed in the table below: Local Authority District Current AB Core (historic) GSS Code Correct GSS Code (Effective from 1 April 2025) Barnsley E08000016 E08000038 Sheffield E08000019 E08000039	10/06/25 - Under investigation

To report an issue not currently listed here, please visit the 'Contact us' page on the OS website.