re recorded fuel data
Surely the reference to 'recorded fuel data' is simply a recognition of the obvious fact that a standard check with the aircraft lying on the ground after a considerable amount had leaked out anyway would have been a poor indication of how much was present at the time of the occurrence. The recorded data would presumably have included the tanks figure as well as that derived from the fuel flow measurement (totalizer in Boeing speak). If the flight was as uneventful as the AAIB hinted, there presumably weren't any fuel measurement status messages either.