You'll notice that on the vast majority of vehicles used by British Road Services. The "wings", also known as mud guards, that surround the wheels are painted black. You will find numerous examples if you have a look on Google Images at any colour photo of a BRS-liveried vehicle.

I found the tilling red for wheels,and try to find out "the black for the wings "
Does everybody know a lot with the parts of the car?I was not able to find one anymore, but thank you for your detailed reproduction.Green is a color of the happiness!