Silver, I'm aware that we are talking about a WORLD airport & I have read the previous 12 pages. My point is that an airport located in, say, the Huntingdon area can serve London better than Heathrow due to far better & quicker links into central London & The City (just 40 mins by train into Kings-Cross at the moment, & that could be upgraded). Such a location will also be able to serve the industries & business of the Midlands AS WELL.
Keep Heathrow as a large international/ regional airport (like Gatwick) but invest in new strategic infrastructure where it can best serve London AND the rest of the UK. Build a new INTERNATIONAL STRATEGIC Airport Hub, but put it in a better location for all. My opinion is that that location is best in the South Midlands rather than in the Thames estuary (probably far cheaper as well) & we are all entitled to our opinions.