Though diesel cars are more expensive to buy, the trade-in value will also be greater, a point that does not seem to be taken into consideration in the diesel vs. petrol debate. The first question a dealer asks is "is it petrol or diesel?", which is generally followed by a turning up of the nose when the answer is petrol.
Practically all motoring correspondents highlight the benefits of diesel without referring to the fact that diesel engines are designed to be driven on long journeys where the engine reaches its optimum temperature, which does not happen on short runs, thereby increasing the potential for engine damage. Thumbs up to you for your very informative question and answer section. How about a full article on diesel-v-petrol taking into account servicing costs and highlighting the potential of engine damage to diesel engines when used only on short journeys?