Much as Gordon Brown would like to pretend otherwise, getting the go-ahead for Heathrow's third runway is still far from a done deal. With the Tories and Lib Dems having already rejected the proposal, the PM is now facing a growing rebellion from within his own party. Labour MPs, privately egged-on by cabinet ministers, have tabled a motion opposing Heathrow expansion in a last ditch attempt to persuade Mr Brown to change his mind - reminding him that not only will the third runway make it almost impossible for the government to hit its climate change targets, but that it is deeply unpopular with voters.
45 Labour MPs have already signed up to an Early Day Motion expressing their opposition. If this figure continues to rise, as it easily could with two weeks still to go before the motion closes, then the PM will find it increasingly difficult to defy opinion within his own party.