Now going through the same thing myself mate. Rust started to show on the off side drivers side wheel arch. Took it to my local dealer to inspect the area and they took some pictures and waved a ptd gauge at it. The general manager didn't seam to bothered about my situation probably cause the car was not bought from there!
True to present form vw turned it down

reckon it could not be proved the panel was faulty.
So i have written a letter to vw uk expressing my anger, just gotta wait to see if i even get a response from them.
My next plan of action would be to sit outside my local dealers with a banner with 'vw's rust dont buy one' written on it and then see what happens
