If they didn't keep ramming total UK air demand into LHR we would all be better off.....
But The BAA and the Airlines all have a vested interests, ie money so who can blame them.
That said when the airfare to catch a plane from Manchester to Heathrow and then fly onto Singapore is cheaper than Manchester - Singapore non-stop, something is severley screwed up.....!!
...and as somebody has already said, you can build 6 runways and 6 terminals at Heathrow, BUT there is no airspace left in the South East...
They just don't get it do they ?