I was Googling to see if I could find some info on how the CG indicator on Concorde functioned and found the following two links. The first one is an AAIB report from 2003 regarding a minor fire aboard G-BOAC whilst in transatlantic cruise which resulted in misreadings and failure flags on fuel guages. The second one is from the PPrune archives also dated 2003.
The last two comments at the bottom of that old PPrune thread are interesting since as evidenced by this ongoing thread (as well as the others running in the tech forum), seven years later, many many people are still fascinated by this gorgeous aircraft.
http://www.aaib.gov.uk/cms_resources...pdf_029047.pdf
http://www.pprune.org/archive/index.php/t-109948.html