Their survey, done in the towns and villages around Heathrow, says yes to airport expansion.
There's no reference to that on their website, in fact the site goes to inordinate lengths to avoid defining what "backing Heathrow" is actually supposed to mean, notwithstanding the exhortation to "back Heathrow or face losing more than 100,000 jobs".
We're told that:
"If Heathrow isn’t allowed to expand, then our airport’s future will be under threat. If hub airport expansion is left to foreign rivals - or a new airport is built elsewhere - then that won’t leave enough flights to go through Heathrow for the airport to continue as it is. Instead, Heathrow will decline, even face closure, which would have a disastrous impact on local communities where those 114,000 people depend on Heathrow.
So the impression is cleverly left, without actually saying so, that the local population's desire not to see Heathrow close equates to unconditional support for its expansion. Job done.
It's a truly impressive piece of doublethink, and I take my hat off to the authors.