People do have a choice where they fly. Many people fly to LHR because they want to go on to somewhere else. On a recent trip from Vancouver I spoke to several passengers who were going to get on other planes to go to Stockholm, Copenhagen, Moscow and Newcastle. So they don't want to fly to Stansted or Gatwick if they have to be transported to another airport in the UK.
I can't see why my double decker runway scheme could not work. As far as I can see it would save hundreds of houses and having to move the residents. If they can dig a tunnel under the Channel, why not dig 2 runways under the current ones?
I might ring Boris on monday and by tuesday it will be his idea!!!