Many thanks to all - really helpful and knowledgeable replies as ever, much appreciated.
I completely agree with the poor use of fog lamps by most drivers. I drove back up from Heathrow on the M40 on Thursday evening when there was patchy fog. There was absolutely no issue with seeing people's rear lights and all the rear fog lamps do is make seeing braking lights more difficult. (By the way, a car for every occasion, I had 6 people including me and some luggage which my Disco swallowed up and was just the ticket).
