BBC: The coalition of groups opposed to the expansion of Heathrow Airport may appear to be unlikely bedfellows. They include hardened campaigners and direct action backers Greenpeace and Friends of the Earth as well as middle-England favourites the National Trust, the RSPB and WWF. Also joining them in the anti-camp are groups representing local councils and the residents of Heathrow’s neighbouring village of Sipson. But while each has their own reason for opposing a third …