I have a T-Plate Astra G and I have noiced a crack in the bodywork on the door. Arent cars now covered by some sort of anti corrosion, bodywork manufacturers guarantee? I will try to get a picture of it for you. If you open the driver door, look at the actual side of the door (bit thats hidden when closed) the crack is just above lock mechanism, comes from corner of window into the door. Any help would be greatly appreciated. It looks as if the door has been slammed too hard and it cracked.