I concur with birdstrike and BOAC and their view of the ils ground system. it is very robust and gets more and more precise the closer to the runway (antennas actually) as you fly.
I don't buy that they were low on fuel.
I do imagine that there are a few guys on the forum who know what it is like the last few feet above touchdown in heavy fog. For the preceeding two minutes or so, your vision is focused some 20 inches ahead of you on the instruments. INSTANTLY you have to refocus outside in a low visibility environment to actually land the plane.
One could write volumes on the subject. But it is this instant of transitioning to visual that can throw you off. A well trained crew has one guy on the gauges while the other is maneuvering in a pseudo visual environment. BUT if both guys were looking out the window, there might not have been someone to call an excessive bank angle near the ground. (and again, google: ''transitioning to visual'' on the avweb site for my article on the subject for more information )