National Biodiversity Network
The NBN is concerned with making species data available to anyone interested in the UK’s biodiversity. It's aim is simple: capture wildlife data once in a standard electronic form; integrate data from different sources; and use the internet to enable data to be used many times in different ways by as many people as possible. NBN enables access to a wealth of UK biodiversity data via the NBN Gateway.
The link address is: http://www.nbn.org.uk