Once again thanks to everyone who has patiently answered my questions. I have certainly learnt a lot about Concorde over the last couple of weeks.
I also agree with many other people who have said that the valuable information provided on this thread should be recorded for posterity. Not an easy task as she is such a wonderful and complex machine. Mind you I think that such a project would be worthy of a Heritage Lottery grant, I say that as in my "real life" I have had experience of how Lottery grants are awarded.
Regards
Nick