It could be my cars' twin!
There aren't many UK SMB F90's and I've seen a few used ones incorrectly advertised, even by main dealers, as San Marino Blue when actually they're Marina Bay Blue.
If it was used, there should be a "BMW Individual" plate underneath the bonnet on the front crossmember with the colour.
Check out
https://f90.bimmerpost.com/forums/sh...1#post23927311 and the follow up a couple of posts later for pictures of mine and a comparison between SMB and MBB.