There is also a major discrepancy with the planned fuel burn and the actual. Planned burn including taxi fuel would work out at 72,000 kgs actual burn to short finals was only 68,500 based on the AAIB figures. Was this based on FMC fuel indications or gauge indications?
Unless there was a reason for a 5% difference such as an improved route or altitudes it seems a little large to me.
Actual fuel burn can be less than planned for many reasons that include:
Shorter routings
Better levels
Lower ZFW
Shorter taxi
Lower Cost Index
Over a 12-hour flight, lower actual aircraft mass can have a significant effect, especially if it allows a climb to a more efficient level earlier than planned.