National Nature Reserves.
The country’s most important places for wildlife and geology, managed for nature first. Almost all are also SSSIs, so both regimes apply at once.
- Reserve management and access infrastructure
- Development well outside any impact pathway
- Built development within the reserve
- Schemes altering hydrology feeding the site
- Adjacent development without an ecological buffer
Declared by Natural England, and in nearly every case notified as a SSSI as well. Development in or likely to affect one is judged against the SSSI test: refuse where it would have an adverse effect, unless the benefits clearly outweigh both the impacts on the site and the wider network.
How schemes actually fare inside this designation — approval rates, appeal survival, which authorities apply it hardest — needs the designation joined to the decision record. That join isn’t built, so those figures aren’t published here. We won’t estimate them.
Check the impact pathways — hydrology and recreation reach beyond the boundary.