Never heard of that on a P6 but BL did have a COSMIC Blue which was a dark metallic slightly purpley blue used on later Landcrabs (Wolseley Six) & Allegros & Maxis etc.
This site has a list of Rover colors including a paint code for Cosmo Blue, used 1967 - 1969.
Also has a listing for Cosmic blue with different years, and code.
Hope this helps.
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