I was on duty both days the first Concorde visited. I remember BA sent us a Concorde weight and balance manual a couple of weeks in advance – as I recall the loadsheet was too complex for the BA computerised system to handle because the C of G at take-off had to be an exact figure (45% MAC I think). This was achieved by specifying the amount of fuel in each tank, of which I believe there were 14. So I was sweating over how to complete this manual loadsheet for days beforehand. What BA forgot to tell us was that they were sending their own load controller on the day just to complete the loadsheet. Probably just as well.