Rod is correct, I spoke with the bloke who could not buy the car on his Turkish licence, as I understand it when you translate your licence from English to Turkish you pay for each class of vehicle, my Berlingo, Doblo's etc are classed as "small lorries" (Kaymonet) which can not be driven on a licence just for a car, so when you have your licence translated make sure all categories are done. This is how it was explained to me at the Citroen garage when I was going to buy a new car last month.
Mark