Furthermore, there would be considerable disruption caused by its construction. M25 users would face years of disruption between junctions 14 and 15, whilst the residents of Harmondsworth would face relocation.
Moreover, many are reporting that this third runway would only be a stop-gap between a potential fourth runway. Which begs the question why we don’t think long term and build a 21st century airport that will be fit for purpose for many years to come? With a majority Conservative government would it not be more logical (easier?) for them to make a long term decision and give serious consideration to a new airport in the Thames Estuary or even somewhere north of London? Assuming HS2 is given the go ahead, a new hub airport could be built near Birmingham with an HS2 connection, with journey times into London comparable to that of Heathrow.
With a number of large scale infrastructure projects on the horizon, why not adopt some joined up thinking and integrate these projects as much as possible? And why stop at transport? The Government could build a new parliament building next to what I'm calling the "Birmingham Transport Hub" (new airport and HS2 terminal), allowing the Palace of Westminster to be opened to the public and its restoration to be part funded by the public?