It should come under the auspices of the RPRA especially if the bird had a Gb ring surely they have "Duty of Care" to the card carrying fancier. It is all too easy to pass the buck and not to rock the boat.
Tim - How did it manage to get in. I have a problem with the new neigbours cats (3) and have had to fit wire to the front when I lock them up in the evening
Mine love the rain, bugger trying to get them back in just lie there with the wings up not too keen on the wind being too strong otherwise let them out.
It sounds a bit harsh especially as the breeder is only getting 40% surely all should pay proportionate costs as you will all get cut at the final selling price. Looks like having your cake AND eating it