London City Airport has urged passengers to check with their airlines after severe weather overnight:
Due to fog this morning flights are experiencing disruptions. Passengers should contact their airlines for more info http://t.co/DolBChVA
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.