Heathrow Runway Alterations

Heathrow would tunnel a 14-lane stretch of the M25 underneath a new third runway in an attempt to make its expansion plans work, the airport has announced.

It unveiled a revised £15.6bn plan for Britain’s biggest airport on the deadline for submission to the government’s Airports Commission, which will choose between Heathrow and Gatwick for an extra runway in south-east England.

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