There does not seem to be an officially defined shade of blue, but a bright blue is seen in for example these pictures of prime ministers:
Many do believe that it should be dark blue though, as shown by a quick ducking. On Wikipedia, there seems to be an ongoing edit war about it.
Then there is the color of the feathers, that allegedly where changed from blue to grey in 2011, but sources are not 100% reliable.
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Seems like for a while editing it to light blue was seen as vandalism, but now editing to dark blue is being seen as vandalism as the government site uses light blue.
