I have up to £10,000 to spend on a used car. My wife, who will do most of the driving, can only use automatics. We will do less than 8000 miles per year, but fuel economy (both urban and motorway) is very important. I need something with a good sized boot (to fit baby kit in etc.). A diesel would be perfect, but they seem to be very rare in automatics. Can you suggest a few models to look for?