This BTO study uses new statistical techniques to more accurately estimate population trends in British Peregrines. Combining old and new methods could improve our knowledge of survival of Peregrine survival at different ages. Notes We are extremely grateful to all the ringers who have gone to great efforts to ring Peregrines over the years and to all those who have taken the trouble to report the dead birds they have found. The Ringing Scheme is funded by BTO, JNCC (on behalf of Natural England, Natural Resources Wales, Scottish Natural Heritage, and the Department of Agriculture, Environment and Rural Affairs, Northern Ireland) and the ringers themselves.