Tristar autoland was excellent. THe R A F 'incident' was a product of the usual 'holes in the cheese' syndrome. When I was involved with the Tri, the, then, BA Fleet boss told me of a day's schedule LHR-CDG x2 which was flown , to schedule and with the only sight of the ground being the taxiing at each end. A good basic system was made better by the Tristar's DLC.