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It looks like it might have molted some of the ventral feathers in an unusually regular way..
What a fantastic thing to watch! Lucky you.
It came back the next morning, spent some time in the middle of the lawn, then hopped round the back of the shed to grab the remnants of the carcass and fly off with it. I hope it had a good grip of it because it would be a grisley thing for it to drop in the middle of town...
Lat/Lng: 54.66269, -3.37171
OS grid ref: NY116305