I have posted the message below on Calis on the Farm Updates but in case you are not going, contact me with your experiences through the forum because we are taking this further with VW in the near future.
As time passes more owners of even very new Calis, as well as older ones, are now discovering the dreaded roof corrosion. I have been in discussions with VW Customer Care over a period of time and I think it would be a very good idea if we were to share our experiences at COTF this weekend. I really think it needs a combined effort from all owners affected if we are to get the warranty extended because if VW feel the current repair procedure is a permanent fix (which it should be) they should have no problem in including it in the 12 year warranty rather than the 3 year one.
Graham