The bird was present and "showing well" down to approximately 20m, as it fed on a sheep-grazed piece of land in Cheshire. Within a few minutes, the bird flew up and over me and the small group of admirers(!), and landed on the rocks behind us.... in Derbyshire!
It then flew back into Cheshire, and promptly disappeared over the hill! 15 minutes later it reappeared and landed back in the original field and fed for the next hour or so, before I left at 1pm. Here are a few photos.