Is it not that Concorde uses 09L/27R all the time because it is longer than 09R/27L, and it needs as much tarmac as possible..(no flaps/slats). Forecast for next few days is for easterlies to continue, so my money is on 09L for departure/take- off.
Be warned, however, with those easterlies come cold winds, so if you plan to view this memorable event ' in the flesh', ensure it's covered up!
