What about a section on the site for pigeons to be moved, a thread for south, one for north etc. We can post up where birds are coming and going and the couriors can check it out. If its convenient for one they can get intouch. Or even a fancier could have a wee loft visit if he's on the move.
I'm sure its not going to be as simple as that but might be some sort of start.
Al.