Fog threatens to disrupt morning rush hour as air passengers face delays

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Dense fog is threatening to cause travel disruption across southern England, with air thousands of air passengers facing possible delays.

The Met Office has issued a severe weather warning for London, south-east England and parts of south-west England over dense fog that is likely to hit the morning rush hour.

Heathrow airport warned passengers to check their flight details before they leave home as visibility at the hub was reduced to 100 yards.

A yellow warning of fog is in place until 10.30am, but freezing temperatures and low winds could see it persist into the afternoon, Met Office forecaster Mark Wilson said.