Some interesting comments.
I also discovered another interesting pigeon trait on the day. A good friend of mine managed to get away from work so I put him in the field that had always been the best one. I took a field 2 up the valley.
His cam net and decoys were rather basic and he didn't get much shooting whilst I was getting all the birds. I could see the birds coming up to his field then diverting away and up to my field.
I eventually put him in my hide and let him have an hour of steady shooting. He commented that he could see the pigeons coming up to his field, looking, then, turning away to head straight to my field.
Only difference was my field craft and my magnet.
Clearly makes the difference between a poor day and an average day.