Pity!Very sad news today. The Longtailed Tits nest has been ripped apart. I think magpies found it and have eaten the chicks. The pesky magpies have been around a lot in the last few days, and the nest wasn't well hidden.
You would typically see the blue color in the photo, but it's not always noticeable on an actual bird outdoors. It depends on how the light is reflected, I guess.
Up here in Edmonton area I've photographed them occasionally and even in sunlight the head was only slightly blue. IOW they tended to look all black so it seems, like starlings, you've got to catch the light at just the right angle.
Thanks Alan. It was in shadow and soft light and a bit of luck. Yes, at first sight it looked like a blackbird, somehow.