My wife has a 2005 Volkswagen Polo 3-door diesel, which she bought new. It has now done only 19,600 miles and is well cared for. We noticed a small area of rust on one of the front wheel arches with the paint blistering, but not broken. As the car has a 12-year anti corrosion warranty we contacted Volkswagen about this. They have offered a 50 per cent goodwill contribution to remedy the problem (this will cost us £300). The Volkswagen dealer said this is common on cars of this age and the cause is the wheel arch liner rubbing against the inner face of the wing. As the wheel arch liner is a standard fit from new and the car has a 12-year warranty, should Volkswagen not carry out the work at no cost to us? They have also intimated that they are making this offer as the car has an incomplete Volkswagen service record. We have had it regularly serviced at a local garage (non Volkswagen) but using Volkswagen parts, and the service book is fully stamped. Could you offer any advice, please?