SNP '˜might refuse to back Heathrow expansion'

The third runway is controversial. Picture: AFP/Getty Images

MPs from the Scottish National Party are as yet undecided on whether to back the UK Government over plans for a third runway at Heathrow, it has been claimed a head of a crucial vote today.

The official position of the SNP Government in Edinburgh has been in favour of the Heathrow extension, but there have been questions emerging in the last week about the specific benefits of a third runway to Scotland.

A senior party source told the BBC that the party at Westminster remains unconvinced of the case for Heathrow expansion and could yet vote against the plans when they come before the House of Commons later today.