Silver, if (and it's a big if) your analysis is correct, the replacement airport has to be accessible to the whole country, not stuck in the middle of nowhere.
In other words it needs to be north or west of LHR and not east. Forget the nonsense about high speed links and only "20 minutes" from London.
However, there are many reasons why a replacement airport is fraught with difficulty and there is no need to mention them again here.
As for Boris, he has to be an MP before he can replace Call-Me-Dave as Conservative leader should the latter fall under the proverbial "37 bus".
He has promised to serve a full term as mayor which takes us past the next election. If he's lying about that, could he not be lying about "dying in a ditch", etc. as well?