The survey was basically questioning residents about the future of a hub in Britain and whether this should be at Heathrow or Boris Island, suggesting there are two options (for that survey at least). The fact that Boris has used this to big up his idea of a Thames Estuary airport also links back to this point. While the participants could say to 'change nothing' the way in which the survey has been talked about suggests all of the participants are either for one or the other, which of course is not the case.