Some good history on the 1989 flight with lots of technical info:
First Non-stop England-Australia Unrefuelled Flight - 1989
Another good source with some interesting info about how they prepared the fuel:
The Delivery Flight of Qantas Boeing 747-438 VH-OJA by John McHarg (April / May 2012).
One afternoon, Peter Brookes took a call from Shell, confirming they had refined the fuel but in two batches, which wouldn’t mix unless agitated. 'What should we do?' said Shell. 'Agitate it!' replied Peter Brookes. The solution to this problem was solved when they tracked down a couple of railway fuel tankers, rinsed them out (it was probably a bit more complicated than that) part filled each of them with pre-determined quantities of the two batches of fuel and shunted them backwards and forwards in a local marshalling yard before decanting them into the waiting road tankers. In passing Shell also mentioned that the fuel they’d produced also showed a startlingly low freezing point - minus 70°C - and would that be OK? Shell said they could probably crank it down a bit lower if necessary.