BORIS Johnson has defended his decision not to resign over his opposition to the UK Government’s plan for a third runway at Heathrow as the SNP Government was called on to make a Holyrood statement on whether it still supported the controversial £14 billion proposal. . http://www.heraldscotland.com/news/16312292.boris-johnson-defends-missing-heathrow-vote-my-resignation-would-have-achieved-absolutely-nothing/