All these wierd and wonderful conspiracy theories and fanciful senarios will all be proved wrong. I think one should just look a little closer to home. Most of these disasters end up being something really simple.
Lets just suppose that BA engineering staff who are required to stick check the fuel system every 24hrs. What if that check is never done, i'm talking years. The accumalation of water in the fuel will be massive. AAIB have confirmed presence of water in fuel.
I would just suggest the AAIB pull the CCTV at LHR for the times MMM was there. I guarantee that they will never find an engineer performing the required water fuel stick check. Though of course all the sheets will be stamped by their B licence guy.
To illustrate the strength of the thread, immediately following the crash, the whole BA fleet had fuel drain stick checks called. Its rumoured the amount of water found during this operation was enough to float the QE2, but then it must of got there in the last 24hrs!
But then this theory is too simple for all you bright sparks in here!