Hard to believe it was forty years ago. I too, have a personal interest in this accident. Simon Ticehurst was a friend of mine.
Three guys on that flight deck messed-up. Simple as that.
Aileron Drag, I disagree with you, it's not simple. A primary factor was the lack of an appropriate baulk mechanism to prevent premature droop retraction. I've often wondered why there were two separate levers, rather than a single flap/droop lever.
I've just discovered that there is a transcribed copy of the report here:
http://www.fss.aero/accident-reports...2-06-18-UK.pdf