MPs backing for Heathrow expansion 'is a stitch up': Campaign group say r Airports tsar expected to recommend at least one extra runway Heathrow extension has been backed by all-party select committee But campaigners describe the support as 'clear choreography' Campaigners opposed to a new runway at Heathrow insist that MPs' support for the plan is an 'establishment stitch-up'. Airports tsar Sir Howard Davies is expected to recommend at least one extra runway at the West London site in his report on expanding capacity options to be published today. The Heathrow extension has been backed by the all-party Transport Select committee and business leaders. Transport Minister Patrick McLoughlin has said a manifesto commitment opposing Heathrow expansion runs out after the next election in 2015 Transport Secretary Patrick McLoughlin says he would not rule out Heathrow expansion. But residents' campaigner John Stewart described the support as 'clear choreography'. 'It all smacks of an establishment stich-up.' he said. Sir Howard Davies has put Heathrow front and centre of his thinking and the cheerleaders are talking it up. But there will be fury. His report will fire the starting gun for protests. Sir Howard's proposals are also understood to include extra runways at Gatwick and Stansted. The Heathrow extension has been backed by the all-party Transport Select committee and business leaders Plans for a major new runway in the Thames Estuary - backed by London Mayor Boris Johnson - are set to be side-lined, if mentioned at all, on grounds of cost and practicality. Downing Street and Chancellor George Osborne are said to have asked for an extra option to be added - possibly Stansted - to stop the short-list looking too Heathrow-centric. Speaking from Afghanistan yesterday, Prime Minister David Cameron rejected suggestions that the report was a 'fig-leaf' for a U-turn. He insisted that Sir Howard's Airport Commission report was 'extremely independent'. Mr McLoughlin also said a manifesto commitment opposing Heathrow expansion runs out after the next election in 2015. Graeme Leach, of the Institute of Directors, said: 'Heathrow is already full and must be the priority for expansion.'