Wildlife Trusts: volunatary bodies, with local branches, working to protect wildlife. Often manage nature reserves.
British Trust for Ornithology: independent body researching British birds:
Industry Nature Conservation Association: body offering advice to industry to develop in harmony with wildlife on Teesside.
Humber Inca: body working to promote wildlife-friendly development for industry on the Humber Estuary, an internationally-important estuarine habitat.
Sustainable Cities: guidance for developing wildlife corridors in cities
http://www.sustainablecities.org.uk/greeninfrastructure/wildlife-adaptation/wildlife-corridors/
The Woodland Trust: promotes conservation of existing woodlands, and planting of new ones.
http://www.woodlandtrust.org.uk/en/Pages/default.aspx
Yorkshire Naturalists’ Union, a network of enthusiasts, amateur and professional, sharing knowledge of Yorkshire plants and animals. Publications and training days open also to non-members. http://www.ynu.org.uk/about