Well i accidentally bought the ex superchips demo car from a franchised VW dealer.
During the period of "negotiation" to get my money back, VW said they would warranty the car as it didn't have any fault codes or show any signs of wear that a remap would cause. This was despite it being ragged around many an airfield by every man and his dog and countless Journos. I did advise them they were setting a rather confusing precedent with that decision but they were going to stand by it.
VW were no help at all tbh in getting the car rejected but the dealer did own up and pay me back everything reasonably quickly.