ah, but what if you get no FLARE annunciation at 30'R?
No experience of cat 3B ops personally, but might I hazard a guess that you flare it manually? My gut instinct is you'll touch down during a go around initiated from c20', and given that the autoland light hasn't illuminated at this point I'd assume the flight path is reasonably stable anyway, so is raising the nose a couple of degrees an option? A baulked landing could also be initiated subsequently I guess. Just by tuppence worth.