IMO Heathrow is a fragmented mess from the passengers point of view & London would be much better served by a new properly planned airport. There is enough open countryside around Stansted for a major development without displacing thousands of homes.
Simon.
I think at the moment you’re absolutely right about Heathrow but from what I’ve seen of the T5/HE projects BAA are determined to make LHR a new airport within the next 10 years.