This is Nimbyism at its worst.
As far as I can tell, most aircraft departing in the direction of Ascot actually are turning south before they reach Ascot.
And the other poor lamb, concerned about Bagshot & Lightwater hasn't a clue what she is talking about. Any aircraft venturing in that direction are generally heading for 4 to 5 thousand feet. That is getting on for a mile above! And as for all these jumbo jets waking her up after midnight, she is having a laugh.
Add to that the location of the proposed new runway, putting departing aircraft much further away, it begins to sound like moaning for the sake of moaning.
Anyway, at the speed things move here, by the time the 3rd runway is built, there won't be a need for it. We will be getting beamed from A to B in our personal intergalactic transporter systems!
And probably the EU will have passed legislation by then prohibiting powered flight on noise and pollution grounds so look out for some bloody big gliders in the area!