I haven't read the attachment above, but in the Telegraph the guy is always saying that faults that are "reasonably foreseeable as being there when the car was sold" are the responsibility of the seller. A DPF isn't a consumable item, it is a permanent feature of the car designed to trap smoke particles and then burn them off later.
These DPF things need the car to be used hard from time to time to make them work (burn up the particulates) properly. People at work see me as someone who drives too fast, but I am the diesel owner who has never had trouble with a DPF!! HTH
