120.4, I know exactly what you mean about the cul de sac issue LTN has had a similar issue for years, as you are probably aware, still, if the Orange order were given a big enuff bung to go to STN in a few years time, BAL and MON go to MAN for their maintenance with a similar 'incentive' then that might free up a bit of westerly airspace!.
Sclub, one problem with LGW is you HAVE to demolish Charlwood to do it, (fancy footing that bill?), and the airport will still be poorly placed to capture the 'London' market, particularly that from the west and north. By that time, 2019, STN will I predict be on its third runway planning inquiry!.