The Transport Secretary rejected a rival proposal from Arora Group, saying Heathrow’s own plans were ‘the most credible and deliverable option’.

Ministers have backed plans from Heathrow Airport’s owners that would see the M25 moved to make way for a third runway.

Transport Secretary Heidi Alexander rejected a rival proposal from Arora Group, saying Heathrow’s own plans were “the most credible and deliverable option”.

The Heathrow proposals involve building a 3,500-metre runway and require a new M25 tunnel and bridges to be built 130 metres west of the existing motorway.

The Arora plan, put forward by a group led by hotel tycoon Surinder Arora, was for a shorter, 2,800-metre runway that would not require diverting the M25.

But in a written statement to Parliament, Ms Alexander said th

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