My Mk3 is Valencia Blue.
I bought some from the club shop, it was a very good match to what was left inside wings etc. Then I had a local car paint company mix me some more and that came out noticeably more blue. The tints for the mix came from their computer listing for Valencia Blue.
I ought to have taken it back, at some point I intend to get more from the club and respray wrong shade.
The correct shade - difficult to describe in words - but is a mid blue with a slight greeny tinge.