1. In overflying the summit (and hill walkers) at 100 ft, was the commander not in breach of the Air Navigation Act? This does not appear to be mentioned in the report (or is the link just to a redacted version of it?).
My reading of the report is that the aircraft never reached the peak, but entered severe turbulence approaching the mountain, dived, and crashed into it some distance below the peak. The pilot did not therefore overfly the walkers on the summit and his intention may well have been to route around it, remaining at least 500' away at all times.