Non-statutory sites can be considered to be of metropolitan, county or local importance and include:
CountyWildlife Sites (Essex and Hertfordshire) and Metropolitan Wildlife Sites (Greater London) are designated by the County Councils and Greater London Authority respectively following consultation with relevant conservation organisations. Local Plan policies and the Local Development Framework policies that replace them should help protect the sites by not allowing development to take place that would be damaging to them.
Sites of Nature Conservation Importance. This is a composite term for non-statutory second tier sites (below SSSIs). These generally include County and Metropolitan Wildlife Sites and can also include third tier sites such as London Borough Wildlife Sites.