Best reply ive ever heard on here, the bit about each loft having its own ailments, and any birds introduced can fall ill is what any pigeon fancier knows, but never admits. it also works the other way, ybs bought in can wreak havik with your own.
If they send knowing the weather conditions how can they moan about losses? but they will, they will blame everything but themselves.....they are their own race controller, so if heavy losses this weekend, only themselves to blame.