I hope it works, but will be a lot dearer, I done a pricing plan and did not find it viable. It would be ok to do it by areas but the minute you cross over it becomes very near impossible. Ok in central areas but the minute you have rural or outlying areas definately would not work.
Couriers like Amtrak have hubs all over the country, we would need something like a holding loft able to section or quarantine birds.
Example pick any place in britain, lets say Scotland. right in the middle of Edinburgh/Glasgow/Moffat/Creif you have Whitburn, ten pigeons to each of all places all, Amtrak would do that from £170 if they were for four adresses or they would get £1200 for 40 seperate adresses, good money at the top end but no way worth it at the bottom end.
How would anyone cope if they had to go beyond that small area like Carlysle to Aberdeen or Greenock to ST Andrews for the same money.
Bearing in mind Amtrak can, from Aberdeen/Greenock/St Andrews to Kent/Plymouth Swansea/Cardigan, because they are not just carrying pigeons to all these places
I think you would have the same networking nightmare if not a hell of a lot worse :-/