Yeah the polo, particularly the squareback, doesnt take kindly to being chavved up and the parts arent really available anyway (try putting a wing on THAT!). Best to stick to mildly tweaking the engine and handling to get a better driving experience and subtly smartening the interior/exterior in small but effective, satisfying ways.
Mind you, if you haven't retouched that photo at all before posting it, that might not be neccessary (save for some alloys

... looks like the previous owners really took care of it! No visible rust, and it's a tornado red that hasn't actually gone pink... garaged, was it?
nice one, welcome!
(PS 1.3 5speed is it? and what do you think on owning a car with an all-metal sunroof? looks smart

....but, best to aim a hose over it and check for leaks before you get a nasty, "britains worst driver" style shock down the back of your neck in a cloudburst!)