OS ESG Known Data Issues

This page lists known data issues in relation to the OS ESG product. As and when we resolve a known data issue, we will remove it from this page.

Live known data issues

Data Issue Name	Data Issue Description
Complex junctions error	At some complex junctions (where many Road Links intersect), multiple junction features are being created, rather than the one required.
Unnamed Railway in SAO text	Approximately 130 tunnels with classifications of CT22TT and CT22TP (Rail Tunnel and Rail Tunnel Portal) currently incorrectly have UNNAMED RAILWAY describing networks in their SAO text. Improvements in the data supplying the Emergency Services Gazetteer in August 2025 will provide station information for these tunnels. Note that UNNAMED RAILWAY is a valid value, for example, where the railway does not terminate or go through a station, but rather to a siding. It may also be the case for railways not on the mainline, for example, in dockyards. It may also be where the underlying railway network data is generalised. For further information, please see the rail information on the More than Maps page for OS NGD Transport Network.
Mersey Railway Tunnels and Westferry Circus Tunnel ommited from the data	The Mersey Railway Tunnels and Westferry Circus Tunnel are not present in the July 2025 release.

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