In message , at 19:30:49 on Sun, 25 Sep
2016, tim... remarked:

The issue with LHR being London's main airport in the wrong place is
"should it have been moved before T4 was given permission"

IMHO the answer to that is "Absolutely"

Where would you have put it? Bear in mind that Maplin Sands, and several
other sites had been rules out already, so you might have only Stansted
on offer. And that already had an active set of pressure groups opposed
to even any extension of its status as the third airport.
--
Roland Perry