It very much sounds like these are purpose bred birds, bred toward a specific goal; that is not a mutt, it is a project that may develop into a breed with sufficient time and effort. It sounds very interesting, and I will be watching to read new posts. Due to his location, Dr Bramwell may have access to birds with the smokey gene, which looks similar to blue, but breeds true. I wonder if this may be in his birds, or if they are the blue gene?