Nigel, thank you for that feedback. It was indeed tragic.
I would concur that the accident appears to have been a mechanical failure (the footage, to me, certainly seems to support that) and I think it was extremely cowardly (but not altogether unsurprising) of Fairchild to level the blame at the driver.
Yes, there was a low overcast that day, but this did not have any bearing on the abrupt change in attitude which G-AVTG experienced.