is that the 777 that impacted short of London HR had issues with fuel and temperature
Certainly did!! All such FAR 25 aircraft have, in limitations, a minimum fuel tank temperature, set at 3 degrees above the freezing temperature of the fuel in use. If you get to that tank temp., you either have to increase Mach No. of descend to warmer air.
On the day the BA B777 had the problem, the air mass over Russia had been particularly cold, as a result of a combination of circumstances, the fuel filters became partially blocked.
Thus, insufficient fuel flow was available when power was required.
It was the inspired action of the Captain, in reducing the flap setting, and reducing drag, without much change to lift, that enabled the aircraft to clear rows of houses and a major road, and make the grass just short of the runway.
Tootle pip!!