After the New York A320 crash today maybe one should consider the effects of a similar incident off the end of the new proposed runway. The M25 would not be a pretty site.
The east and west approaches to LHR are not renowned breeding sites or migration routes for geese or other fowl.
On the other hand, the alternate site of the Thames estuary being proposed
is such an area. I would suggest that the chances of such an occurence happening would be far, far higher there than inside the M25.
