The departure of Justine Greening as transport secretary in yesterday's government reshuffle is being seen as opening the way for a change of policy as she is a dedicated opponent of expansion at Heathrow Airport.

Zac Goldsmith, MP for Richmond Park and opponent to the third runway, believes Greening's move shows the "government is at least opening the door to the possibility of a third runway".

The government have "got to get off the fence... it is not fair to keep people in limbo," he told the Today programme. And he reiterated that he would carry out his threat to force a by-election if the Tories changed their position on this issue.

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