One of the considerations of any LHR expansion is the large number of extra stands that would be needed At the moment BA have their a/c scattered all over the place. Low cost carriers whose a/c traditionally don't night stop have got round the problem by opening overseas bases. To have all your eggs (a/c) in one place usually leads to chaos when an a/p suffers delays due to w/x or strikes etc, BA always canx a large proportion of their S/H flts in these situations so I question whether an even a larger hub would really make their operation run any more smoothly.