# 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 | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | |

Basic Land and Property Unit (BLPU) features which either don't have a corresponding Land Property Identifier (LPI) or don't have a Classification
AND
LPIs and Classifications which don't have a BLPU feature

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This is a known bug we are working on and it impacts fewer than 10 features.

Customers may experience validation problems; however, for most customers directly loading the data into their own databases or performing their joins in a GIS system, this bug does not impact the product function. The small number of impacted features will not appear in the data, as a successful join will not be possible.

Issue raised on 08 April 2026.

| | 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](https://docs.os.uk/more-than-maps/data-demonstrators/network-demonstrators/os-ngd-transport-network). | | Mersey Railway Tunnels and Westferry Circus Tunnel omitted from the data |

The Mersey Railway Tunnels and Westferry Circus Tunnel are not present in the July 2025 release.


Issue raised in July 2025.

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