I write to alert readers to potential unintended consequences of using headlights on auto setting. Such a facility is fitted to my Freelander 2 and I leave it on that setting most of the time. However, I was somewhat surprised last week, in the densest fog seen for several years, to note that the lights remained resolutely off. I noticed this very soon and over-rode it, but passed three or four unlit vehicles in the opposite direction, all Land Rovers or Range Rovers, which set me wondering whether they had the same set-up and had not noticed. Given that the rear foglights only work with the headlights on, were the lights to self-extinguish in mid journey, the potential danger would increase. My tactic now is to avoid that setting altogether.