The solution
Build an airport at Cliffe
Why continue building on congested ground at Heathrow, with a grid locked road network and less than desirable flight paths, when Cliffe has potential for a great road, rail, sea network , with approaches/departures over the water.
Look at the evidence, there is only one logical answer to the shortfall in capacity for airtravel in the future...It's on the Hoo peninsular!