The first thing I'd do is set up a company to buy a Concorde & run it for pleasure flights.
Then I'd buy a HUGE chunk of BA shares, sit on the board & arrange to sell a Concorde & loads of spares, etc to said company. As soon as that's arranged, I'd sell my shares in BA, quit & invest the money in the Concorde flying co to buy the concorde.
With the remainder of the money, I'd buy an island in the Carribean & build a runway big enough for Concorde to land on (though not with any other passengers except me & mine).
Concorde would go back to pleasing the masses through pleasure flights. The profit would pay for the running of my island, the decent twin that takes me shopping in Miami, my aero's aircraft, my seaplane that I'll need to visit my neighbours, my Spitfire & my grass roots flying aircraft.
All very unlikely though as I don't waste my money on the Lottery!