Just to add a bit of levity:
I am absolutely not surprised but a lot of you tree-huggers out there have missed my main point.
Where I mentioned that the fact that we did a 20 minute turn round seems to have gone through one ear and out of the other.
Even in those days, APUs were allowed at even the most restricted airfields, for 5 minutes after blocks in and then 10 minutes before blocks out. (Except in exceptional circumstances).
Ergo; on a 20 minute turnaround, we are actually only talking about a 5 minute gap in between the two parameters. I am amazed that the loaders even noticed. I certainly didn't because I was a bit busy and forgot to start my stopwatch.