By your own admission, (Tech log Cat IIIC thread 2ndMarch2009) Smiths and Hawker Siddley who designed the Trident autoflight system are the ones to thank for the L1011 precise Autoland system.
Only because Smiths and Hawker Siddley did it first, Old Fella, not that they assisted with the L1011 design.
The Smiths system on the Trident was triplex, the automatic approach/land system on the L1011 is dual/dual.
It was, if I recall correctly developed by Collins Radio, in Cedar Rapids, Iowa.
And, you just proved my point about profits that could be made with the 'ole TriStar (Cathay Pacific is but one example)....properly maintained, the airplane was (and still is) a good performer.