Where might that be Chevron-Farnborough?
I have often wondered if it could be used as a sort of Luton for SW London as it does have excellent transport links and indeed extending the runway to the west might be feasible too. The problems though are that much of the space which could be used for ramps terminals etc has been developed and unlike most airports which are or were fairly remote FNB is literaly in a town centre .
Wisley as has been stated would never get even a second look because of the rich Nimbys in that area. The problem UK has is that if Boris island is built then there are no airports west of London at all and who is going to travel out to the thames estuary when at the current rate of increase the rail fare would be about the same as a J class ticket to JFK (exageration yes but it makes a valid point)
So where next Blackbushe, Odiham, Lasham, Benson