Heathrow: Grayling to confirm final plan for third runway

Transport secretary will set out proposals amid growing rift over expansion scheme

Chris Grayling is to confirm the government's final plans for a third runway at Heathrow as the Tories prepare to impose a three-line whip in favour and Labour considers whether to remove its backing for the project.

The transport secretary will set out his proposals for the expansion to senior colleagues on the cabinet's economic subcommittee on Tuesday morning, before the decision goes to the full cabinet for approval.