I have an 07 plate gti the same as yours. It has exactly the same as that on the drivers side. The other strips on the doors will go like that too looking at the edges and corners. I bought mine from vw a couple of months ago from breeze in Poole but took it to a more local dealer to get it looked at. They took photos etc. but VW would not get it fixed as they say it is not on the body. For the moment a have sanded it and painted it so it does not rust any more but at some point I need to get all the door strips done properly. The steel grey body paint is immaculate.