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I read that and it did seem better thought through than a Third short runway.
But it didn’t really address the issue of construction towards the west of Heathrow, and proximity to the World Heritage Site of Windsor Castle. There is quite a lot of influence which would kaibosh that idea.
I simply don’t believe that they have properly costed the construction of the two new runways, nor taken into account the cost in terms of fuel and noise taxiing to them, or indeed the continued noise and pollution, not mention crash risk over central London.
Finally, and runways which involve approaches over Central London will require them to be closed six hours per day, reduce their capacity by 25%.
A four runway airport at Heathrow would provide significantly less capacity than the same four runway airport sited in the Estuary.