you can mention it but they will tell you its caused by "fallout" thats whats in the air when the cars parked up,maybee when your st was waiting to be shipped to england or infact when it got hear and was parked up in the compound somewhere or infact at the dealership itself,reason being thats what i was told as the wifes white st had this problem some time back,you really need a good quality car shampoo and car wax i reccomend auto glym or indeed megires thats also good,halfords sell it oh and you will also need some serious elbow grease to shift those little speckles of rust like pin prick things.....good luck.