Thanks for the pointer. I've managed to locate a copy of what I now know was Silent Witness "Gone Tomorrow" on Amazon.
My family had a few police connections, so we heard a few things at the time that never went public. Having read the accident report, I agree with BHL that it is very hard to believe that Ben would have made the suggested pilot error.
I've recently come on one of the salvage divers who took the photos that were lost before the inquest. If anyone has anything that they could share on of off the record I'd appreciate it as this has haunted my life for far too long. pm me for my email if you'd prefer to do this off forum.