Butterfly-Conservation.org - very useful org + East Midlands branch
UKButterflies.co.uk - great info about butterflies incl. food plants
Big Butterfly Count - join up, download, survey in July/Aug
Eastmidlands-butterflies.org.uk - for lowland Derbys, Notts, Leics, Rutland
RSPB (Royal Society for Preservation of Birds) - everything from bird identification, to food, to seeds for wildflowers and advice about wildlife habitats, projects to do at home, and reserves to visit.