Agree 100% Roland , the most effective and credible programme on this disaster would have been one after the BoI reports. Then, armed with all the facts and considerations of the board, they could make a critical assessment of the findings and make whatever point they wanted.
Suspect the programme was intended to transmit coincident with the BoI report, but with time dragging, the BBC decided not to wait.
Naturally, there is a lot of interest in the report, not least from the families. This is understandable. They want the answers as quickly as possible.
However, the BoI is considering all the FACTS and circumstances. This takes time. The 'public' accident report is generally a very slim document, but the complete report is generally inches thick, reflecting the time and effort going into it.
The public, if they care at all, will watch the programme and make up their minds based on that, not the facts. Panorama may well identify some of the salient issues, but I for one want to see the official report.