Ron, I suspect that the white head and neck is due to overexposure because of the angle and albedo and is not necessarily a true indication of the plumage colour.
I'm no expert, I'm only using reference books on which to judge its type. To be honest I think it's just as likely to be a Whistling Kite as it is to be a Brahminy, particularly as both species change so much in their juvenile, immature and adult appearance.
Thanks John, My bet is still the whistling kite because of the tail shape and the wing patterns.
I agree with on the overexposure of the head, that is why I leaned more towards the Whistling Kite. Cheers Ron