If faithfulness to the name and spirit of a car that has come a very long way over the years is a virtue, then Volkswagen is undeniably the champion in this respect (as the Beetle, Passat and Golf prove). The Polo, the German marque’s second most successful model, is another shining example of this: in thirty years of existence and four generations (the first dates back to January 1975, when it took over from the Audi version of the Polo, launched in 1970), 2,700,000 examples have been made. The fourth generation, introduced in January 2001, is now handing over the torch to the fifth, which, preserves both spirit and name: this change in generation has not just altered the looks, but also the substance of the car, to slot it…