The AAIB promised more updates as and when, it is about time that we had more info on the progress of the investigation. Even though they cannot pinpoint the exact cause at this time they could well, hopefully, destroy many of the speculative theories expressed in these august posts. I know from personal knowledge that they have brainstorming sessions with all of the inspectors at Farnborough expressing all of the likely reasons for the accident, and they then set about eliminating each likely cause until they find one that cannot be eliminated. I am seriously concerned that they are not going to find a definite cause for the lack of demanded engine thrust from both engines.