My Jaguar regularly shows a red dashboard warning saying the diesel particulate filter is full. I'm told I should, at some point since the previous time it happened, have driven for at least half an hour at 50mph or over. I was never told the car was totally unsuitable for someone whose normal journeys take less than half an hour on urban roads, otherwise I would have bought the petrol model I looked at first. Surely I can't be the only customer like this?