We are looking for a small car for my mother, with the following characteristics: four or five doors as a baby seat needs loading and unloading, diesel as weekly trips up and down the motorway will be made so economy is important, and automatic due to slight arthritis. We've identified a 2007 Mitsubishi Colt with an AMT automatic gearbox, but we've heard a few mixed things about the reliability of this gearbox, so I'm interested in your views. Also, are there any other cars we should be considering for £5-8000?