I have a different FS reference than Wojtek for the blue, so for what it's worth:
Insignia Blue - FS35056 or BS381-110 Roundel Blue
Yep ... the colour FS 35056 is said to be used for pre-and post-war roundels of the lighter and more bluish tinge.
Here the comparison of both colours.
As the one can be used the Vallejo Model Air 71004 Blue - FS35056-RAL5002.
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