The type certificate was surrendered late last year, as Spacecadet says, the complex and extensive infrastructure that supported this operation no longer exists.
Look, with Concorde you have to remember that few were built, so relatively few people had real experience on the type, it was not like operating a mass produced aircraft.
Even as late as July 2003, BA
, with all their experience and pioneering operation on the type, with so many of the Engineering staff having been with the aircraft since the start, in the case of our ex BAC employees, having been with Concorde before the start of operations, with a niggling but minor problem on one aircraft, still they traced and contacted a BAe guy who had retired in 1996, but whose opinion we wanted to help resolve this issue.
Or in late 1997, when United Space Alliance (who maintained the Space Shuttle), visited BA
Concorde Engineering for advice on running a tiny fleet of unique air vehicles long out of production, they did not go to the nearest aircraft MX
facility in FLA, they came to us as they saw our operation as the next nearest thing to what they were doing.
To return a decommissioned BA
Concorde to flight, you'd have to do it soon, even if you had permission and the people, the costs of re-commissioning would run into 100's of millions of £, mostly trying to recreate something like the support network, even the hydraulic fluid was unique to Concorde, Chevron who made it, would want top $ for restarting production of M2V fluid in small amounts.