Bury currently has 50 Sites of Biological Importance, which are Bury's best sites for flora and fauna. They are surveyed and designated on behalf of Bury and the other districts of Greater Manchester by the Greater Manchester Ecology Unit. They are a category of site described nationally as 'Sites of Local Biodiversity Interest' and are protected by Unitary Development Plan Policies EN6/1 and EN6/2.
The grading system indicates the value of sites. A basic relationship can therefore be established between grade (i.e. the extent of ecological interest) and planning control decisions:
Grade A - of Regional or County Importance (primary reason for planning refusal)
Grade B - of District Importance (secondary reason for planning refusal)
Grade C - of importance within the identified geographical locality (secondary reason for planning refusal)