Thanks Keith, I have seen your post regarding the elusive BBS wheel colour a good bit of detective work on your part.
I did have my scuff repaired and to be fair to the smart repair guy (I have alloy/tyre insurance) he did a pretty good job of matching the colour, confessing he had to 'play' with two colours (black and silver) to get the blend right before finishing with final clear coat.
It's always a concern that despite having rims repaired there is always a risk that colour match might be discernably noticeable from original colour.