Good catch Trevor. Such lovely birds.
Could be the same bird I photographed in 2009 as a juvenile near St.Ives. It had yellow ring on left leg. See my Peregrine post at anthonyswildlifephotos.blogspot.com for close up.Very Nice image of this bird.
How beautiful plumage! you catched it really well!!
Nice photo. Usually a very tricky species to get.