By Press Association 2021 Brexit Boris Johnson appears unlikely to live up to his commitment to lie in front of bulldozers to prevent the building of Heathrow’s third runway. As London mayor, Boris Johnson claimed the expansion of the west London airport would mean “investing in decline” and vowed to obstruct construction because it would “fail both London and the UK on every level”. In September 2015, he sent a 30-page dossier to MPs and peers attacking the decision by the Airports Commission to recommend the expansion of Heathrow, and instead pushed for a new island airport in the Thames estuary.