Studies of the New Forest Curlew breeding population have been going on for some years, with particular attention given to avoiding disturbance to the birds by visitors to the area; for details of the 2016 results see http://www.wildnewforest.co.uk/new-forest-curlews-crisis/
See the presentation New Forest: Russell Wynn, New Forest Wildlife Group (PDF) given at the Slimbridge Conference in February 2017.