Thames Estuary airport plans to be examined
The government is to hold a formal consultation on controversial plans for a new airport in the Thames Estuary.
Downing Street said no decisions had been made but ministers wanted to explore all options for maintaining the UK's status as a global aviation hub.
David Cameron has ruled out expanding Heathrow but his deputy Nick Clegg is said to be opposed to the estuary idea.
Richard Westcott reports.
18 Jan 2012