There will be no new airport. I'd don't think any financial institution would stump up enough cash to pay for it unless it was 120% or more underwritten by UK taxpayers with guaranteed future returns. Banks will only invest if there is no risk and a return within five years. And as the government doesn't have enough (of my) cash, it won't make these assurances and fortunately the days of Blair are well gone. So it won't be happening. But fortunately the public toilet called Heathrow will continue to soldier on and provide me with a living.
PM