You can see at a glance how recent the map data is by looking at the Data Updates page. As a supplement to this, and as a general guide:

• designated sites get updated approximately monthly, though in some months there are no changes to some of the designated site types, such as National Nature Reserves.
• Ordnance Survey map layers get updated only once or twice each year.
• Biodiversity Action Plan Priority Habitats will probably be updated annually with major revisions at least once every three years.
• The Priority Catchments were developed during 2003 and are likely to be upgraded, in light of new evidence and information, at some as yet unspecified time.
• Information relating to the list of designated sites at risk from diffuse agricultural pollution can be found through consultation of English Nature Research Report 551 (http://www.naturalengland.org.uk/publications/publications/default.aspx).
• The Farmland Bird data sets were developed during 2003 and are likely to be upgraded on either an annual or biannual basis.

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