How hard is it to judge height above Roof Tops in the Dark?
There are Street Lights and other light sources visible to aid in judging height.
Add that to the definition of angle by looking at building shapes, streets, vehicles (moving and parked)....there is still a lot to see that would aid in determining height.
Somehow I find it hard to accept that the Pilot would misjudge aircraft height by Hundreds of Feet even without a RadAlt or Landing Light being functional.
Actually it can be extremely difficult, ambient light conditions, weather - especially if its raining and cockpit management - ie dealing with low fuel etc.
The roof of that pub, at night and in rain could easily be mistaken for tarmac, unfortunately we will never know for 100% certainty, the facts are that an experienced high time pilot got in to a situation that snow balled very quickly resulting in a serious accident.
We will all have our own opinions but I think it is disingenuous to start portioning blame on the pilot in light of how much is still unknown about the root and subsequent causes. In all likelihood it would have been a chain reaction sequence of events that ultimately caused the crash.