
That’s ok as I’m pretty sure that that’s not the classic BRG anyway.
there is no such thing as "classic" BRG
A bunch of race teams, especially Lotus and Sunbeam started painting their cars dark green and racing them that way, so people started thinking of British race cars as being green, the way everyone thought of Ferrari as red.
the manufactures sold production cars to the public in dark green too, and everyday Joe's started calling it BRG
There's nothing more to it than that, all the British manufactures sold and raced cars in other colors too.
Jaguar did it too, I'm not sure if Austin Healy ever had a dark green car.
Also I'll take this moment to lament how the usual idiots destroyed the once great British sports car industry.