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I don't agree with this method of fog light use at all - the idea of switching them off when you see the headlights of another car behind you, I've never heard of that before. If you are driving in genuine foggy conditions (ie viz below 100m) then if a car behind you sees your fog light in front of them, your fog light hasn't done its job, it's doing its job. If you then switch your fog light off he is no longer visible with you, as the fog light was the only part of your vehicle he could see to judge his distance from you. If you go and switch your light off he has lost his only visual reference. A fog light is very bright in normal, clear, daytime conditions, but in condensed water vapour the light is diffused to a much lower intensity by the suspended water droplets. You would have to be very close (way too close) to a car in fog to be dazzled by its fog light. Driving in those condition can be challenging enough without constantly switching your fog light off and on everytime you see a car in your mirror. Even more simples is if the visibility is seriously reduced - fog light goes on, when visibility improves - fog light goes off again.

the modern cars light come on automatically in reduced visibility. we should copy our Scandinavian neighbours.

There are so many folk out there that seem to think it is necessary to switch on their fog lights as soon as they get in their cars. Not sure if they think it makes them look "cool" or it is just plain ignorance. There are also the tubes that don't switch them on when they should. Like most things, unless there is a crack down nothing will change. Very hard to change bad habits.