Boris Island airport versus Thames estuary wildlife - interactive map 5.

Boris Island airport 'would bring Brazil billions to UK'

Do you think the "Boris Island" airport plan is a good idea?

Boris Island airport: economy trumps environment once again 3.

Mr Johnson already firmly backs a new "Boris Island" airport and architect Lord Foster has produced plans for a £50 billion airport on the Isle of Grain in Kent.

How the Boris Island airport would impact Thames estuary wildlife 4.

Boris Island airport: don't fasten your seatbelt yet 4.

Over 67m people pass through London's Heathrow airport each year, but about 150m a year would use the proposed Boris Island airport in the Thames estuary.

There is, however, another possible explanation for Cameron's decision to hold a consultation on the Boris Island airport, suggested to me by the Guardian's transport correspondent Gwyn Topham.

Boris Island airport versus Thames estuary wildlife - interactive map 5.

Boris Island airport 'would bring Brazil billions to UK'

Do you think the "Boris Island" airport plan is a good idea?

Boris Island airport: economy trumps environment once again 3.

Mr Johnson already firmly backs a new "Boris Island" airport and architect Lord Foster has produced plans for a £50 billion airport on the Isle of Grain in Kent.

How the Boris Island airport would impact Thames estuary wildlife 4.

Boris Island airport: don't fasten your seatbelt yet 4.

Over 67m people pass through London's Heathrow airport each year, but about 150m a year would use the proposed Boris Island airport in the Thames estuary.

There is, however, another possible explanation for Cameron's decision to hold a consultation on the Boris Island airport, suggested to me by the Guardian's transport correspondent Gwyn Topham.