I take it you've seen the details of the Gatwick plan? Although given your comment I suspect not.
Main objections were noise from new flight path, not the construction itself which was largely within the existing airport compound
I feel the Heathrow decision given the impact and decimation of villages that will now be on the runway and need to tunnel the m25 is a poor decision. Either extend the existing second runway or go Gatwick.
Poor poor plan and poor decision in my view
In goldsmiths constituency they were 72% for remain whilst zac himself was for Brexit. Lib dems will play that card hard. Also could argue a vote against goldsmith would reign in tory appetite for Heathrow expansion given fear of other MPs like justine greening and the one who won Twickenham...