There was an extended forum thread (on pretty much all aspects of Concorde - went on for tens or hundreds of pages) that was linked from here once - afraid I don't have it to hand.

If this thread is anywhere, I would bet its on flyertalk (awesome air travel forum with great info).

Maybe this one: http://www.pprune.org/tech-log/423988-concorde-question.html

Very interesting.

Thank you very much.