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Update
We caught the bird at about 5pm today. Reported it straight away. Received the owners details within five minutes. I phoned him straight away as, apparently, some owners don’t want them back.
He lives about 20 miles away and came straight round. Pigeon is not a racer but highly valued stock bird. It got spooked by a hawk and escaped. Owner showed me bruise on wing.
So happy ending.
Thank you all for your replies.