It does,
but doesn't come on with ignition,
as its a supplementary switch function it only shows as a warning on the dash when you pull the dial out to select the fog-light.
I discovered that if you snap two little bits of metal inside the bulb holder, it short circuits the warning system and it doesn't show as a buld problem.
(found this while inspecting bulb holder, appears the car garage had done this to hide a wiring prob perhaps?! great!)