Mach, the Tenerife comment was purely in reference to a collision between the aircraft, no more. The Concorde pilot telling the near miss story was asked by John, "Surely you mean 20 metres?", No he replied "20 feet", 16:50 on the video.
With reference to a possible abort the official report says,
it appears that the residual speed of the aircraft at the end of the runway would have been 74 kt for a takeoff aborted at 183 kt and 115 kt for a takeoff aborted at 196 kt.
These figures show that an aborted takeoff would have led to a runway excursion at such a speed that, taking into account the fire, the result would probably have been catastrophic for the aircraft and its occupants.
Between a rock and a hard place it would seem, the first sign of trouble was 6.4 seconds after V1 at 188 kt CAS.
V1: 150 kt
VR: 199 kt
V2: 220 kt
The left wheel truck took out a runway light and burn marks on the grass show deviation well to the left.
A closer shot from the 747, photo is full frame and not cropped.
