A major policy U-turn by Boris Johnson has opened the way for the expansion of City Airport, but a final decision is likely to be delayed.

The Mayor has written to Newham council voicing his support for plans to increase the number of flights out of the airport by 50 per cent.

He had previously objected on the grounds of reducing carbon emissions and his policy U-turn has angered environmental lobbyists.

He has now said he will write to the Government to inform them of his change of heart. However, he has asked that a final decision is delayed until the publication of a study by the National Air Traffic Services.

This is looking at how extended public safety zones at the end of runways, where development is restricted, might affect Thames Gateway bridge plans.

In the letter he said: "I offer support for the expansion sought by London City Airport. [But] I am also concerned that the current proposals would effectively blight a significant number of public safety zones which are earmarked for regeneration.

"I shall therefore be writing separately to the Government Office for London, withdrawing earlier objections, and confirming my support for the current proposals."

If the plans go ahead air traffic could increase from 80,000 flights a year to 120,000. Friend of the Earth said the decision backtracks on his promises to reduce carbon emissions in London.

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