I dont doubt that you did Darren. Just wanted to add that the jack does have its uses and some tips to stay safe.Appreciate your view, but tick and tick to your points and still it happened. The ground isn't overly loose either.
I'm satisfied I did things to the best of my ability, I'm no novice as I've said, and wanted to raise awareness. If people want to carry on using it for regular lifting and trust in it that's equally fine.