It is almost a near certainty that the pilot of G-LBAL wasn't current in 0/0 takeoffs. I would wager he hadn't done one before but thought he could 'manage' it on this occasion. On paper 0/0's seem straight forward..........
On all sorties where IIMC or lack of visual references are expected we would advocate that the NHP must follow through and be prepared for disorientation.
Because this seems to be the cause of this accident.