Train travel difficulties are continuing this morning.
Overhead wire problems between Northampton and Rugby meant buses replaced trains between Northampton and Coventry, while an hourly train shuttle was running between Coventry and Birmingham New Street, with journey times in the area extended by up to an hour.
There were also overhead wire problems affecting services in and out of London's King's Cross station.
The bad weather disrupted services at Christ's Hospital in Sussex, with trains between Barnham and Horsham delayed.
A broken-down train at Melton Mowbray in Leicestershire led to delays of up to 45 minutes between Leicester and Peterborough.
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.