Will, Ed, thank you both.
I very much take the point that we know that it was solid phase water that triggered the roll back, my point was a little wider and not well made.
Without going over old ground too much and with due caveats ........
What we don't know is why, if the fuel was shall we say "well within spec" (neutral language) and the flight path and temperature profile not that statistically unusual, the problem has not occurred in something close to this form in many other flights too.
After all I've read, I'm still mostly in the "it's the fuel" camp. Was it made right, was it handled right, was the water drainage right etc ad nauseum.
CW