leb001,
While it's a nice pic, the artist has been taking a fair amount of artistic liberties....
For instance, the door located at the forward end of the wing, just forward of the emergency exit, is pure fiction.
The tail is something between proto and production.
As said, the registration is a few paint smears, and does not correspond to anything real.
AFAIK, G-AXDN (01) never had a British Airways livery.
I'd suggest the picture could have been inspired by DG, or SA (but in that case the BA livery is on the wrong side), or one of the production aircraft delivered to BA in the period that livery was used (such as G-BOAC).
I would consider it as a generic British Airways Concorde from the early days. I don't think there was an attempt to carefully depict one particular aircraft.
Hope this helps!