Boris Johnson: Delay on Heathrow expansion due to "environmental concerns"

Boris Johnson, the Mayor of London, who opposes Heathrow expansion, said the government's indecision could be down to the Prime Minister David Cameron's "environmental concerns" about an additional runway.

Business leaders have responded with anger at the government's delay in reaching a decision on it.

The British Chambers of Commerce said it was "gutless", while another group said it would have business leaders "tearing their hair out".