Take a look at the RSPB’s ‘State of Nature’ 92 page report:

www.rspb.org.uk/Images/stateofnature_tcm9-345839.pdf

and Butterfly Consevation’s ‘The state of Britain’s butterflies’ for some sobering reading:

http://butterfly-conservation.org/1643/the-state-of-britains-butterflies.html