Interesting pic from Rob. Does look like a Sparrowhawk. Brings to mind some very similar remains I found in a barn on the Marsh Road. They were Dunlin and Starling and must have been taken by the Barn Owl(s) that occupied the box in that barn. This was back in very cold winter a few years ago. I later found another set of remains in a nearby barn, which were all that was left of a juvenile Kestrel. I don’t think Peregrine would leave this much! The wing measurement I take when ringing birds is from the bend in the wing to the longest primary tip. Rob, can you try to get this and I’ll check the range for male Sparrowhawk?