I have often read in your column of the shortcomings of diesel engines when used for frequent short runs, particularly the huge expense of replacing a DPF. I am in the process of a career change, becoming a freelance gardener, and I need to buy a small van. Unfortunately petrol-engined vans, which would be more suitable for the type of short journeys that I will be making, seem to be very thin on the ground. Do you have any suggestions please?