Trident autothrust system and autoland

[avionic type]

I see the old jokes are begining to come in over the initials B.E.A. etc but it was my airline and I was very happy to work there, I prefered the Trident 1 to the others and was happy to see the Auto pilot from when it started in 1964 as a very basic system to when it reach the system that was trusted to carry out fully automatic Cat3B/C blind landings with complete faith by all. It had 3 of everything 3 separate power supplies ,3 hydralic systems, pitch and roll computers, gyro units, servo units on each control surface so it was a complicated piece of kit
in fact it was 3 auto pilots working together and if 1 disagreed with the other 2 it was automaticlly disconected from the system and the other 2 carried on ,if they disagreed with each other the system disconnected itself and and the A/C reverted to manual flying but after a lot of work it was finally given the authorisation to do what it was designed to do.