Coalition policy rules out expansion in this parliament but the Treasury has indicated it is open to the idea in the long term. The issue splits the government and backbenches alike
16 Dec 2013: Letters: Leaders must explain how expanding one of the world's most polluting airports could ever be consistent with building a low-carbon economy
Companies often make the argument that they need more airport capacity but the data, as this graphic commissioned by WWF shows, suggests business flights are on the wane
13 Dec 2013:
Barely three years after plans for a third runway were scrapped, Heathrow has returned to the front of the queue with bolder expansion plans