I believe that BCAL achieved this certification on the BAC 1-11 just prior to the take over by BA. I think Terry Snow was the avionics wizz who did the work.
I did many Autolands in the 1-11. We had "autoland Eddy who did the tech work. the system was developed by Airbus to persuade. Bcal to buy the A320.
It only had a single channel AP. It worked most of the time!!