I've been maintaining a keen eye on this incident - I'll be very interested to know the final AAIB findings. I personally think the most significant thing to be gained from this latest update is the mention about the state of the engines - i.e. still running above flight idle albeit not at the commanded thrust setting. Whether or not there was a reduced fuel flow (perhaps due to electronic control, physical issue, fuel contamination/waxing, etc...) will be revealed in due course I'm sure.