*pulls hair out*
Live4speed you are 100% wrong, why on earth did you even post if you
didn't know for sure if you were even right ARG people like you sure make me steam lol
anyway Bloke (I like the name btw!) The Vanquish is winnable in all of the colors seen at the dealership, BUT since it is a single race type...when you win the vanquish, your stuck with the color you got forever, you cannot win the vanquish again by doing the race over. However you CAN (if he hasn't already saved, which he probobly has no doubt) shut off your PS2 and re-do the race again and again until you receive the color you were hoping for (not great method, but only way without gameshark etc.)
If you are playing your own game keep this in mind with ALL cars won this way, you cannot win the car back again if it was awarded in a single race manner (like the british cup for the vanquish or the sunday cup) only
SERIES races allow you to win a car each time you complete, aswell as endurance races. Rally has the same race structure, so it has the same rules...complete the 3 races, win the prize car.
Always keep the cars you win, even if you don't think you'll use them....trust me, when you get a ways through the game, you'll want to go back and tinker with some of the slower cars and such, or maybe even use some for future races to make it a challenge, and the prize cars you win sometimes come in colors not purchaseable, so keep em! cuz you can't get em back unless you start over!
check this site and do some searches if you want to know which cars come in certain rare colors and such, and where they can be won.