AZR
"- the fact that the runways lights taken out were impacted significantly after the aircraft caught fire, as demonstrated by the evidences on the scene.
- the fact that the aircraft maintained the centre line with no apparent difficulties until thrust was reduced (due to fire) on left hand engines"
The aircraft should be able to maintain the centreline even after reduction in power: it must be certified with engine failure at any point in the take-off run. However the engine thrust should not have been reduced if the speed was above V1, you don't shut down engines for fire until stable in flight. All engines should have been closed below V1, so whenever the fire occurred thrust imbalance should not have caused the aircraft to veer from the runway.
It seems very likely that the emergency was mishandled or the poor bogey maintenance caused the crash. The only alternative I can think of is that the fuel leak caused fuel starvation to both engines which caused an immediate drop in power to well under 50% on the left engines. Obviously I don't know the fuel system of the Concorde, but it doesn't fit with anything I had heard about the accident, and seems inherently unlikely.