Sorry, I have nothing to do with BA (or Sliver)
Anyway, my point is I prefer expansion to Heathrow, but if it cannot be done poltically, then the only choice is to build a new one in an area that has a small population density yet as good transport links
A location by the thames or lets say Bucks, Bedfordshire etc can work as long as LHR (and other airports) are shut down as long as there are decent transport links