Labour could vote against plans for a third runway at Heathrow airport in a move that could see the decades-long plan blocked by Parliament.

Senior allies of Jeremy Corbyn told the Financial Times that he and colleagues are almost certain to oppose the third runway in a Commons vote on environmental grounds.

The move means the plans for the £16.5billion runway are at significant risk because as many as 60 Tory MPs are opposed to the expansion of Heathrow.

It could leave Theresa May, the Prime minister, dependent on the support of the Scottish National Party and rebel MPs as she tries to push the plans through Parliament.