Hi Craig.
I'm rearing a few hundred pheasants at home at the moment and i have a few white pheasants that ive reared from days olds. I don't think they'd last long out in the wild for as long as the other birds as they really stand out so natural selection is against them. My idea is that i can use the white pheasants to see if i've controlled vermin well enough, as if they start disappearing then i can do something about it. Also they will show how far they disperse from the release point.
But back to the question... i think the best bet is to ring a local game farm to see if they have many that they want to get rid of. How many birds do you release and shoot with your syndicate? where about are you in the country?
Henry