Warning: I'm non-professional; not crew, not engineer - just scientist guest and thanks.
In support of Phil Gollin's comments ....
The critical issue arising from the crash of BA038 is starkly worded below (from the AAIB interim report (Water ice in fuel, p12)),
Below this temperature (-18C) little is known about the properties of ice crystals in fuel and further research may be required to enable the aviation industry to more fully understand this behaviour.
Either the AAIB made a mistake in this claim or the industry has an immense problem. Either way the AAIB's final report will be very interesting.
Regards, Tanimbar