This is a slight blacklit shot ,i wont photograph the bird after 1030am at this site and on this shot the sun was just about to hit the birds back ,could be the light .
Also their is a small grassy bank just behind the bird ,i have photographed Kingfishers from dawn tull dusk and it never fails to amaze me at the different variation of colours you can get in different light ..strange thing is their is no blue pigment in kingfisher feathers ,i always see a turquoise bluey green close up,could be me though ,and as you are probably aware Kingshiers are actualy Brown very strange .....