I've had a quick go using the Natural England & Scottish Natural Heritage files to identify potentially missing (or missing bits of) Nature Reserves in England & Scotland. (Welsh data is definitely not open).
All I did was check to see if the centroid of a nature reserve from one of the national datasets fell inside an OSM polygon. Works most of the time, but not for the odd funny shaped reserves. The files were polygons so complex NRs which are missing appear multiple times (see St Kilda, Rum etc). National Nature Reserves I've shown in red, Local ones in blue. umap.openstreetmap.fr/en/map/potential-missing-local-nature-reserves-on-osm_55319#10/51.5933/-0.1744 There are a few large ones which it should be easy to sort out (Richmond Park for instance), but many others will require a bit of sleuthing to identify their boundaries without using the shape files. Personally I'd rather see boundaries based on surveys, particularly when the boundary corresponds to other on-the-ground features. Jerry
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