Gatwick Airport has said that there is no disruption to flights due to the fog, despite notices on its website saying many flights had departed later than scheduled:
There is no disruption at Gatwick this morning due to the fog. We hope you have a great journey with us!
Clear skies and light winds are a recipe for fog to develop, so allow extra time to defrost your car and check before you travel.
It's another bitterly cold day today. It's all down to where the air originates from - and today's can be traced back to Russia.