Originally Posted by forget
The Airliners.net shot was a taken with a very long lens. Checking out the building roof etc (yellow arrow) against Google Earth - aircraft ended up at red line.
Correct. And if you go further North-East, you will see that the picture was most likely taken from the terminal of TLS airport (or one of the office buildings adjacent to it).
So what happened if this was after the test was completed? One possibility would be that while slowly turning the aircraft towards the exit, thrust was applied too early (either inadvertently by the pilot or due to a technical failure).
Can anybody guess what speed would have been necessary to push the nose over the concrete wall?