Seeing a few used SEAT cars listed which are 'Cat S' where the seller has passed an MoT after repairs. Obviously one wouldn't buy without an independent inspection. But I expect that in a lot of cases, the car has genuinely been returned to pre-accident condition, so my question is what discount should one seek based on the Cat S status itself? Even if the inspection indicates the car's condition is what it was before accident, the status will follow it around for the rest of its days and make it far harder to re-sell, and possibly more costly to insure.  Is a 25% discount about right?