MPs set to vote on Heathrow Airport runway plan

British MPs will vote on whether to build a new runway at London's Heathrow Airport on Monday, potentially paving the way for the airport's expansion after decades of delays and policy U-turns.The government is expected to win the vote, although the result could be close on the issue which has split MPs regardless of their party lines, with some opposed to the extra noise and air pollution it will bring to London.Heathrow is Europe's busiest airport but is now operating at full capacity.