I'm not sure, as I don't really know what people would consider the extent of the St Dunstan's area. If it was still(?) a ward or parish, I'd put it at the centroid of the polygon, but that doesn't apply here.

Incidentally, I see from the Historic England open data that you have an unmapped Grade II listed memorial in the NE corner of the cemetery - https://historicengland.org.uk/listing/the-list/list-entry/1271538

If you have a compatible phone and the inclination, you might find the StreetComplete and Mapillary apps useful. StreetComplete is great for surveying things like path surfaces and accessibility. Mapillary lets you upload georeferenced photographs to use while editing (and makes them available to other mappers).