Around the early 80s there was a story that some of the BA/BEA/Airtours/Caledonian Tristars had different autoland fits. Some could autoland and some couldn't........
The story went that that a crew used to an autoland capable aeroplane, carried out an autoland at Gatwick one fine day and wrote in the tech log after landing "aircraft landed heavily and well left of centreline on autoland"
The engineers cleared the fault by writing in the action taken column "Autoland not fitted to this aircraft"
Love to know if it really happened.