Oldlae
I would absolutely refute that Ben Breach just "flew it in" since he made a "mayday" call and said "ASWI - Engine Failure - ditching". Ben then held the PTT button open until the end to give as many clues as possible.
The Bristow version was that the centre shaft running up to the MGB probably failed causing an overspeed shutdown (double engine shutdown) and that for some reason the auto went wrong at the bottom. Could it have been damaged hydraulics leading to a loss of control at the bottom?
I will never forget that terrible day in 1981. I don't think they ever recovered the wreckage from the shifting sands in that area.
As good as the old Wessex could be at times, it was a good decision to ground the fleet and replace them all for commercial operations.