twisted, are you trying to say that in full on 3C conditions (i.e. zero/zero, no viewable centerline and thus taxiway lights) you are going to steer a wide track undercarriage down a narrow taxiway, through an apron and onto stand (remember that you won't be able to see the stand's guidance system) purely by having a LHR controller going "left a bit, stop, now right a bit"!
wizzy