danieldegroot2
The region in question (as well as its LEA region) has already been marked as historic;
https://www.openstreetmap.org/relation/7029778/history

It does not seem to render for me on OSM-Carto (the default OSM map style), so it's likely an issue with Organic Maps' map style. You can try submitting an issue here:
https://github.com/organicmaps/organicmaps/issues
Suggested name: Do not display boundary=historic
Suggested description: Boundary relations with boundary=historic should not be rendered on the Organic Maps map style, as they no longer exist.

This note will be marked as resolved, as this is not something which can be fixed by changing data in OSM.