The UK needs a four-runway airport if it wants to compete with other European hubs such as Amsterdam, Frankfurt and Paris, a report by a think tank said today.
The best option for the four runways would be immediately west of the current Heathrow site in west London, the report from Policy Exchange said.
An airport in Luton, Bedfordshire, would be the second best option.
The report said plans for an airport on Thames Estuary - nicknamed 'Boris island' because of The Mayor of London's support for that idea - were not practical but they did not rule out a third runway at Heathrow.
In fine bombastic Boris style he described himself as an aeronautical Bill Cash, unable to let go until he had changed the status quo.
The Mayor of London challenged the Prime Minister today over his demotion of Justine Greening and vowed to fight any expansion to Heathrow.
Jeremy Hunt and Chris Grayling landed promotions as David Cameron sparked minor controversy in reordering his Cabinet for the first time.