Oh the world in which we live, eh?
Take a look at virtually anytime at LHR and you'll see large aircraft waiting at the hold for 10-15 minutes, burning incredible amounts of JET-A1. Look at BNN, LAM or the other holds and every day there's the majority of arrivals going round in circles for the usual 10-15 minutes or more. Again how much fuel burned?
Reducing delays into and out of LHR should be the reason shouted by this incompetent useless bunch of politicians, reductions in fuel used could be in the millions of tonnes per annum, with runways having simultaneous use for either take off or landing depending on flow requirements, or even mixed mode for one of the three- 09L/27R being the obvious guess.
The key to improvemenmts for ecological reasons, something the Greens cannot deny is reduced holding, and taxi times. Win-Win if we all remained logical and sensible.
Just my 2p worth....