Alistair we have four mki aeros in taff mog one is a very sad but beautifull garage queen the other three including mine have the corrosion as mentioned my frst mk1 the same when i bought my latest car 2years ago it was mint but in those two years corrosion has appeared i live by the sea side and that dosent help matters i was a bit concerned on my first car but not anymore it is what it is