Freezing temperatures and fog descended on London this morning, disrupting transport and halting flights.
Heathrow cancelled 70 flights, while six more were cancelled from London City Airport in the early hours, bringing the total of flights cancelled to 24 at the Docklands airport. Scores more inbound flights have also been delayed or grounded.
Passengers are being advised to check flying schedules before leaving their homes.
Visibility has started improving, especially in central London, but road delays are expected to throughout the day due to ongoing slippery conditions. Overland parts of the Metropolitan Line and Northern Line.
The below freezing temperatures are expected to remain until Friday, but will improve after then as a wet front will approach the city from the west bringing unseasonably warm weather of above 10 degrees Celsius, the Met Office predicts.
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