LHR expansion has never been an election issue and no seats have changed hands because of it, and because of this, and no independent specifically anti-LHR expansion candidate has ever stood for election.
Sorry but I must thoroughly disagree with that! Heathrow expansion has been a massive electoral issue in many constituencies, and was probably the key reason why the Tories came out against the third runway before the 2010 election (David Cameron's "no ifs, no buts" stance). It's also a key political issue in terms of London Mayoral (and Assembly) politics, and there's an election for the London Mayor and Assembly coming up in May '16.