SS,
You have only answered one out of 5 questions on your homework assignment. To suggest low cost airlines would pay for this fantasy, when they have so many other London airports to choose from, built on cheaper terra firma, is madness
You score 0%
Asking price, £60bn New airport, £50bn Profit? Loadsamoney....
You mean lunacy, not loadsamoney. LHR is a tiny site, relative to its global importance. Terminal buildings are not cheap to adapt into office buildings, most airport sites that get re-used keep little of the original structures unless they have special historic value.