Like you said, in poor visability ie FOG you need fog lights in rain, drizzle, spray you need good wipers and to watch where you are going, not blind every poor bastard that is behind you with a big red flare, try driving something that puts you above the average car height and you might ,but that is only a might see my and at least one other persons view in this thread. But none of that alters the fact that it is illegal and if the old bill decide that they dont mind getting wet, it will cost you £60 and points.
See you on the M25, I`ll be the one behind you on High Beam!