For all those that are looking at theories such as lack of fuel or windshear etc. Please stop.
The AAIB have produced a preliminary report, at 600' the engines did not respond to a selection/demand for more thrust. As to what caused that we will continue to speculate.
I personally think the crew did an amazing job.
As for whether 27L was was better than 27R, doesn't 27L have a displaced threshold (LGW operator so don't know)
Hey Shaka Zulu, is that your own personal 777 (just kidding, agree with your post)