Not wanting to get in the way of slast's story, but I have a question about the Trident.
I flew as SLF on this type at least a couple of dozen times, and every time I was in a seat that had a view of the wing I noticed that the aileron was constantly moving. Not in a random fashion, but systematically up and down a few degrees pausing for a second or so at the end of each move, with an attendant roll back and forth. The roll was most noticeable if the sun was casting shadows inside the cabin which moved up and down - it was a bit like being on a ship.
I saw this often enough for it to be a norm rather than a particular aircraft with a lazy autopilot.
Anyone else notice this?