Quote: "If Filton were to remain an option then I'm sure it would have been a good second London airport with all the motorway and rail connections."
Only in "FR world".
If I ruled the world I'd put a new London airport (FR or no FR) at Lyneham, plenty of space, M4 about a bit over a mile away and GWR even closer. Don't know about the WX though.
Suppose it'd severely dent BRS traffic