With temperatures hitting below 0 degrees this morning, the freezing fog has  caused around 200 flight cancellations so far, including several delays.

Early this morning the Met Office issued a severe weather warning due to low temperatures and dense fog. It caused around 100 flight cancellations at Heathrow, Gatwick and London City Airport, and passengers were advised to check their flight status before leaving their homes.

A spokesman for Heathrow airport admitted that “foggy weather across the South East has reduced visibility at Heathrow. As a result, some passengers may experience disruption to their journeys today.”

Millennium Bridge is covered with heavy fog / AP image

“Heathrow’s top priority is the safety of passengers and we apologise to those whose travel has been affected.”

Although the weather conditions were believed to improve around midday, the number of cancellations had doubled by that time. Thousands of travelers have been affected, including Scotland’s First Minister Nicola Sturgeon who was flying from Glasgow airport.

The fog has also caused dangerous road conditions, with slippery roads covered in frost.