Folks - I am travelling for a couple of more days and will reply to each of you when I am back hopefully Friday.
However, what I shall quickly say now is:
a) A huge thank you for the input on this thread, I cannot tell you how much it is appreciated.
b) WWW: As you have reared your head again here - I am not precious, but you could stop being an A.H. Incidentally - you had all the details of the flight via my pm (which I wish I had never bothered to send), so what did you find on that day on that route? Clear skies and unlimited viability? I think not. Yet I see you have dodged that. And: of course you have called me a liar. If you think you haven't, your instructions to your former students must have been as unclear as your other comments here.
TP