This is a most interesting topic.
I have been stopped and fined once before for driving with fog lights on in light rain in central London.
This was actually at about 12am at night, on the day that George Bush visited us and caused massive road diversions in and around central London.
It took me like 2 hours (compared with 35 min usually) to drive to work, all that time I had my fog lights on. I even stopped on 2 sepearate occasions to ask some police officers how I can get to work.
It was only when I was leaving London at night that I got stopped going by Big Ben, and fined etc.
I kicked up a huge fuss, wrote a letter, and got to see the Station top dog guy. I was saying that the law is inconsistent (would I have been stopped/fined if I was a middle aged woman etc.), and that the fog lights (in my car at the time) pointed downwards, and would not really cause dazzle (IMHO).
I have had a 4x4 vehicles behind me before, and due to there higher ride hight, even there normal driving lights cause immense dazzle, so why not make lights hight then x metres about the ground illegal
Would everyone agree that if it was a health and safety issue, that every single time you would get fined etc.? But as we know, even speeding say, people are let off - depends if that officer has had a bad day or not.
Anyway, don't want to go on much more...
D.