I remember my first sight of a Concorde, just after it's first flight. It came right over my house, and the whole road came out to watch. I still reckon it is one of the most beautiful aircraft still flying, bar none. Not bad for an old girl of nearly 35!
How about a final farewell flypast over London of ALL BA Concordes in formation. Surely BA could afford to do it. (Not sure if the pilots could hand fly them for longer than 10 mins though...Might spill their coffee.) Then give them all to museums for free!