Just to add my tuppence. I'm pretty sure there is no Concorde at Heathrow.

Furthermore, the official last flight of Concorde (where all the press were with the cameras) was not actually the last flight of Concorde from Heathrow as another flew off to Bristolish area 2 days later.
I was sitting in a van as it taxi'd past to the runway (used to run plant on and off the airport). It really was an amazing piece of kit and the sound was amazing, glad I had earplugs that day !

HTH