Hi a couple of years ago we had a pigeon lurking round the garden, and when I approached it, it flew off, so thought nothing more about it. Next morning was just getting into my car and found the pigeon dead on the drive.
I contacted one of the organisation named above and spoke to a really helpful lady, who took the leg ring details and notified the owner. A couple of days later I got a phone call from a gent who was really grateful that I had contacted the organisation, he told me a bit about the bird, he was from about 50 miles away and must have got lost on the way home during a training session. I assured the gent there wasn't a mark on the bird and that it looked like it had died quickly.
I buried him in our garden.