British Trust for Ornithology
Over 900,000 birds are ringed in Britain and Ireland each year by over 2,600 trained ringers, most of whom are volunteers.
Huddersfield Birdwatchers Club
Club and registered charity for people interested in wild birdlife, local, national and international.
Northern England Raptor Forum
The Northern England Raptor Forum (NERF) represents the combined fieldwork and conservation interests of ten regional raptor study groups covering much of the upland areas of England.
Peak District Raptor Monitoring Group 