BOAC;
but where are the gear touchdown marks?
Yes...
I don't know; the tracks in the video are not clear enough to determine; Schubinho's
post #383 shows a comparison between the length of the nearby vehicle and the two furrows. With flattening of perspective, they could either be tracks from the engines or the gear or even just mounds of 'disturbed sand' from a last-second application of TOGA thrust as some have suggested, until the aircraft's tail struck the slightly-rising ground. The MK B747 accident at Halifax exhibited this pattern - loss of the tail structure by striking a burm followed by severe nose-down contact, etc.
Yes, the recorders will tell us soon enough. PJ