Some here are saying the -57C freezing point of the remaining fuel is spectacularly low.
Actually this does not seem to be true. If you examine what Shell have to say about fuels around the world, you will read that there are many different grades, different constituent standards and different methods of measuring temperatures.
http://www.shell.com/home/content/av..._10081004.html
There are Russian and Chinese sections on the above page. I mention Russia because there have been reports that the indigenous Chinese suppliers cannot produce enough fuel and have been importing Russian equivalents which have "a low freeze point (equivalent to about -57 degrees C by Western test methods)" - quote from the page above.
My view is that we here don't have enough information to make any conclusions about the provenance, name, constitution etc. etc. of the fuel on BA038. All we know is that the AAIB say the fuel, "
complied with the Jet A-1 specification".
Regards, Tanimbar