Yes, when front fogs are on, no indication on the dash, only when the rears are on, there's a symbol on the dash.
Had to use it (both fronts and rear fogs) 2 weekends ago, at Oxford, on the way back, got very snowy and a bit foggy. Seriously couldn't see squat, end up doing 40-50mph on the highway. At least the fogs light up, more to the side, and more just in front the road ahead.
Mine used to come on quite often anyway (the fronts) as cornering lights, i switfty removed that 'function' as it annoyed me.