It is really difficult to show the colors of cars in photos. Especially in digital photography and and taken with phone. The only way to try to get close to the actual correct color is to adjust the image so that the original object is same time visible. The difficulty is highlighted especially in iridescent colors, which are greatly affected by light. My Avanti Gray looks way too blue in the latest Avanti magazine photos. I don't know if the color shade of the BAT Avanti Gray is correct, but I remember that there were many pictures of that car and the shade was different in different pictures. Of course, it's a matter of opinion, but some colors go well with one car and some with another. It's about the whole design. Often the original is the right one because it also describes the history of the vehicle which will remain for the next generation.
In attached photo you should see quite well Avanti Gray. A bluish gray with a hint of purple.
Edit: It should also be noted that the lowres jpg compressed image changes from the original, and on top of that, we each have our own uncalibrated screen.